MFS Series Trust X N-CSRS 28 Jan 25 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
	Nov. 30, 2024
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	MFS SERIES TRUST X
Entity Central Index Key	0000783740
Entity Investment Company Type	N-1A
Document Period End Date	Nov. 30, 2024

Shareholder Report

Shareholder Report	6 Months Ended
	Nov. 30, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	MFS SERIES TRUST X
Entity Central Index Key	0000783740
Entity Investment Company Type	N-1A
Document Period End Date	Nov. 30, 2024
C000006838 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class A
Trading Symbol	MAAGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ A $ 0.37 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 19	[1]
Expense Ratio, Percent	0.37%	[1]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006843 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class B
Trading Symbol	MBAGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ B $ 1.12 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 58	[2]
Expense Ratio, Percent	1.12%	[2]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006844 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class C
Trading Symbol	MCAGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ C $ 1.12 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 58	[3]
Expense Ratio, Percent	1.12%	[3]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006845 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class I
Trading Symbol	MIAGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ I $ 0.12 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 6	[4]
Expense Ratio, Percent	0.12%	[4]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006847 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class R1
Trading Symbol	MAAFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R1 $ 1.12 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 58	[5]
Expense Ratio, Percent	1.12%	[5]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006849 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class R2
Trading Symbol	MAWAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R2 $ 0.62 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 32	[6]
Expense Ratio, Percent	0.62%	[6]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006850 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class R3
Trading Symbol	MAAHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R3 $ 0.37 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 19	[7]
Expense Ratio, Percent	0.37%	[7]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006839 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class R4
Trading Symbol	MAALX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R4 $ 0.12 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 6	[8]
Expense Ratio, Percent	0.12%	[8]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000231058 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Aggressive Growth Allocation Fund
Class Name	Class R6
Trading Symbol	AGGPX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R6 $ 0.04 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 2	[9]
Expense Ratio, Percent	0.04%	[9]
Net Assets	$ 2,940,855,570
Holdings Count | Holding	16
Investment Company Portfolio Turnover	3%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 2,940,855,570 Portfolio Turnover Rate (%): 3 Total Number of Holdings: 16
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 12.0 % MFS Growth Fund 11.2 % MFS Research Fund 10.2 % MFS Mid Cap Growth Fund 10.1 % MFS Mid Cap Value Fund 10.1 % MFS Research International Fund 8.0 % MFS Global Real Estate Fund 5.0 % MFS Commodity Strategy Fund 5.0 % MFS International Intrinsic Value Fund 5.0 % MFS International Large Cap Value Fund 5.0 % MFS International Growth Fund 5.0 % MFS International New Discovery Fund 4.0 % MFS Emerging Markets Equity Fund 2.9 % MFS New Discovery Value Fund 2.5 % MFS New Discovery Fund 2.5 % MFS Institutional Money Market Portfolio 1.5 %
C000006851 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class A
Trading Symbol	MAMAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ A $ 0.34 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[10]
Expense Ratio, Percent	0.34%	[10]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006856 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class B
Trading Symbol	MMABX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ B $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 57	[11]
Expense Ratio, Percent	1.09%	[11]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006857 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class C
Trading Symbol	MMACX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ C $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 57	[12]
Expense Ratio, Percent	1.09%	[12]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006858 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class I
Trading Symbol	MMAIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ I $ 0.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[13]
Expense Ratio, Percent	0.09%	[13]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006860 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class R1
Trading Symbol	MAMFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R1 $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 57	[14]
Expense Ratio, Percent	1.09%	[14]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006862 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class R2
Trading Symbol	MARRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R2 $ 0.59 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 31	[15]
Expense Ratio, Percent	0.59%	[15]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006863 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class R3
Trading Symbol	MAMHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R3 $ 0.34 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[16]
Expense Ratio, Percent	0.34%	[16]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006852 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class R4
Trading Symbol	MAMJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R4 $ 0.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[17]
Expense Ratio, Percent	0.09%	[17]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000231059 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Moderate Allocation Fund
Class Name	Class R6
Trading Symbol	MAMPX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R6 $ 0.02 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 1	[18]
Expense Ratio, Percent	0.02%	[18]
Net Assets	$ 6,807,643,144
Holdings Count | Holding	23
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,807,643,144 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 23
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Government Securities Fund 9.5 % MFS Total Return Bond Fund 8.5 % MFS Value Fund 8.0 % MFS Research Fund 7.2 % MFS Growth Fund 7.2 % MFS Mid Cap Growth Fund 7.1 % MFS Mid Cap Value Fund 7.1 % MFS Inflation-Adjusted Bond Fund 7.0 % MFS Global Opportunistic Bond Fund 5.0 % MFS Research International Fund 5.0 % MFS High Income Fund 4.0 % MFS Global Real Estate Fund 3.0 % MFS Commodity Strategy Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS Institutional Money Market Portfolio 2.5 % MFS International Intrinsic Value Fund 2.0 % MFS International Large Cap Value Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS International Growth Fund 2.0 % MFS New Discovery Value Fund 1.5 % MFS New Discovery Fund 1.5 % MFS International New Discovery Fund 1.0 % MFS Emerging Markets Equity Fund 0.9 %
C000006887 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Conservative Allocation Fund
Class Name	Class A
Trading Symbol	MACFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ A $ 0.34 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[19]
Expense Ratio, Percent	0.34%	[19]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006892 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® ConservativeAllocation Fund
Class Name	Class B
Trading Symbol	MACBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ B $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 56	[20]
Expense Ratio, Percent	1.09%	[20]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006893 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Conservative Allocation Fund
Class Name	Class C
Trading Symbol	MACVX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ C $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 56	[21]
Expense Ratio, Percent	1.09%	[21]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006894 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® ConservativeAllocation Fund
Class Name	Class I
Trading Symbol	MACIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ I $ 0.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[22]
Expense Ratio, Percent	0.09%	[22]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006896 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Conservative Allocation Fund
Class Name	Class R1
Trading Symbol	MACKX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R1 $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 56	[23]
Expense Ratio, Percent	1.09%	[23]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006898 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Conservative Allocation Fund
Class Name	Class R2
Trading Symbol	MCARX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R2 $ 0.59 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 30	[24]
Expense Ratio, Percent	0.59%	[24]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006899 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Conservative Allocation Fund
Class Name	Class R3
Trading Symbol	MACNX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R3 $ 0.34 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[25]
Expense Ratio, Percent	0.34%	[25]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006888 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Conservative Allocation Fund
Class Name	Class R4
Trading Symbol	MACJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R4 $ 0.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[26]
Expense Ratio, Percent	0.09%	[26]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000231060 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Conservative Allocation Fund
Class Name	Class R6
Trading Symbol	MACQX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R6 $ 0.03 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 2	[27]
Expense Ratio, Percent	0.03%	[27]
Net Assets	$ 3,813,437,829
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 3,813,437,829 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
Largest Holdings [Text Block]	Portfolio holdings MFS Total Return Bond Fund 14.5 % MFS Inflation-Adjusted Bond Fund 10.0 % MFS Limited Maturity Fund 10.0 % MFS Government Securities Fund 9.5 % MFS Global Opportunistic Bond Fund 7.0 % MFS Value Fund 6.0 % MFS Research Fund 5.3 % MFS Growth Fund 5.2 % MFS Mid Cap Growth Fund 4.0 % MFS Mid Cap Value Fund 4.0 % MFS High Income Fund 4.0 % MFS Research International Fund 3.5 % MFS Institutional Money Market Portfolio 2.5 % MFS Global Real Estate Fund 2.0 % MFS Emerging Markets Debt Fund 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Commodity Strategy Fund 2.0 % MFS International Intrinsic Value Fund 1.5 % MFS International Large Cap Value Fund 1.5 % MFS International Growth Fund 1.5 % MFS New Discovery Value Fund 1.0 % MFS New Discovery Fund 1.0 %
C000006904 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class A
Trading Symbol	MEMAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 1.31 %
Expenses Paid, Amount	$ 68
Expense Ratio, Percent	1.31%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000006905 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class B
Trading Symbol	MEMBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) B $ 2.06 %
Expenses Paid, Amount	$ 106
Expense Ratio, Percent	2.06%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000006906 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class C
Trading Symbol	MEMCX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 2.06 %
Expenses Paid, Amount	$ 106
Expense Ratio, Percent	2.06%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000006907 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class I
Trading Symbol	MEMIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 1.06 %
Expenses Paid, Amount	$ 55
Expense Ratio, Percent	1.06%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000071424 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class R1
Trading Symbol	MEMRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 2.06 %
Expenses Paid, Amount	$ 106
Expense Ratio, Percent	2.06%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000071425 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class R2
Trading Symbol	MEMFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 1.56 %
Expenses Paid, Amount	$ 81
Expense Ratio, Percent	1.56%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000071426 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class R3
Trading Symbol	MEMGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 1.31 %
Expenses Paid, Amount	$ 68
Expense Ratio, Percent	1.31%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000071427 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class R4
Trading Symbol	MEMHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 1.06 %
Expenses Paid, Amount	$ 55
Expense Ratio, Percent	1.06%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000071428 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Emerging Markets Equity Fund
Class Name	Class R6
Trading Symbol	MEMJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.91 %
Expenses Paid, Amount	$ 47
Expense Ratio, Percent	0.91%
Net Assets	$ 7,674,867,411
Holdings Count | Holding	101
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 7,674,867,411 Portfolio Turnover Rate (%): 17 Total Number of Holdings: 101 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 % Issuer country weightings China 26.1 % India 16.0 % Taiwan 14.5 % South Korea 12.7 % Brazil 5.7 % Indonesia 3.7 % Mexico 2.9 % Thailand 2.2 % Hong Kong 2.0 % Other Countries 14.2 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd. 9.5 % Tencent Holdings Ltd. 5.9 % Samsung Electronics Co. Ltd. 3.9 % Alibaba Group Holding Ltd. 3.2 % Infosys Ltd. 2.6 % Tata Consultancy Services Ltd. 2.1 % China Construction Bank Corp. 2.0 % HDFC Bank Ltd. 1.8 % Kweichow Moutai Co. Ltd., "A" 1.7 % Kotak Mahindra Bank Ltd. 1.7 %
C000006911 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class A
Trading Symbol	MAGWX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ A $ 0.34 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[28]
Expense Ratio, Percent	0.34%	[28]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006916 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class B
Trading Symbol	MBGWX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ B $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 57	[29]
Expense Ratio, Percent	1.09%	[29]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006917 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class C
Trading Symbol	MCGWX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ C $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 57	[30]
Expense Ratio, Percent	1.09%	[30]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006918 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class I
Trading Symbol	MGWIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ I $ 0.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[31]
Expense Ratio, Percent	0.09%	[31]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006920 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class R1
Trading Symbol	MAGMX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R1 $ 1.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 57	[32]
Expense Ratio, Percent	1.09%	[32]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006922 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class R2
Trading Symbol	MGALX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R2 $ 0.59 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 31	[33]
Expense Ratio, Percent	0.59%	[33]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006923 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class R3
Trading Symbol	MAGEX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R3 $ 0.34 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[34]
Expense Ratio, Percent	0.34%	[34]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006912 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class R4
Trading Symbol	MAGJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R4 $ 0.09 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[35]
Expense Ratio, Percent	0.09%	[35]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000231061 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Growth Allocation Fund
Class Name	Class R6
Trading Symbol	MAGQX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R6 $ 0.02 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 1	[36]
Expense Ratio, Percent	0.02%	[36]
Net Assets	$ 6,793,417,247
Holdings Count | Holding	22
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,793,417,247 Portfolio Turnover Rate (%): 2 Total Number of Holdings: 22
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio allocation Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
Largest Holdings [Text Block]	Portfolio holdings MFS Value Fund 10.0 % MFS Research Fund 9.2 % MFS Growth Fund 9.2 % MFS Mid Cap Growth Fund 9.2 % MFS Mid Cap Value Fund 9.1 % MFS Research International Fund 7.0 % MFS Inflation-Adjusted Bond Fund 5.0 % MFS Global Real Estate Fund 4.0 % MFS Commodity Strategy Fund 4.0 % MFS High Income Fund 3.9 % MFS Global Opportunistic Bond Fund 3.0 % MFS International Intrinsic Value Fund 3.0 % MFS International Large Cap Value Fund 3.0 % MFS Emerging Markets Debt Fund 3.0 % MFS International Growth Fund 3.0 % MFS Total Return Bond Fund 2.5 % MFS New Discovery Value Fund 2.0 % MFS New Discovery Fund 2.0 % MFS International New Discovery Fund 2.0 % MFS Institutional Money Market Portfolio 2.0 % MFS Emerging Markets Debt Local Currency Fund 2.0 % MFS Emerging Markets Equity Fund 1.9 %
C000006924 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class A
Trading Symbol	MDIDX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ A $ 0.35 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[37]
Expense Ratio, Percent	0.35%	[37]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006929 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class B
Trading Symbol	MDIFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ B $ 1.10 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 56	[38]
Expense Ratio, Percent	1.10%	[38]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006930 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class C
Trading Symbol	MDIGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ C $ 1.10 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 56	[39]
Expense Ratio, Percent	1.10%	[39]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006931 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class I
Trading Symbol	MDIJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ I $ 0.10 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[40]
Expense Ratio, Percent	0.10%	[40]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006933 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class R1
Trading Symbol	MDIOX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R1 $ 1.10 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 56	[41]
Expense Ratio, Percent	1.10%	[41]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006935 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class R2
Trading Symbol	MDIKX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R2 $ 0.60 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 30	[42]
Expense Ratio, Percent	0.60%	[42]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006936 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class R3
Trading Symbol	MDIHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R3 $ 0.35 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 18	[43]
Expense Ratio, Percent	0.35%	[43]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006925 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class R4
Trading Symbol	MDITX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R4 $ 0.10 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 5	[44]
Expense Ratio, Percent	0.10%	[44]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000195683 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International DiversificationSM Fund
Class Name	Class R6
Trading Symbol	MDIZX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R6 $ 0.00 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 0	[45]
Expense Ratio, Percent	0%	[45]
Net Assets	$ 38,105,233,626
Holdings Count | Holding	7
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 38,105,233,626 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 7
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio target allocation Portfolio actual allocation Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
Largest Holdings [Text Block]	Portfolio holdings MFS Research International Fund 27.6 % MFS Emerging Markets Equity Fund 17.2 % MFS International Large Cap Value Fund 15.0 % MFS International Intrinsic Value Fund 15.0 % MFS International Growth Fund 15.0 % MFS International New Discovery Fund 10.0 % MFS Institutional Money Market Portfolio 0.2 %
C000006937 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class A
Trading Symbol	MGRAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 1.05 %
Expenses Paid, Amount	$ 54
Expense Ratio, Percent	1.05%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000006938 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class B
Trading Symbol	MGRBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) B $ 1.80 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	1.80%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000006939 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class C
Trading Symbol	MGRCX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 1.80 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	1.80%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000006940 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class I
Trading Symbol	MQGIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 0.80 %
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.80%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000071431 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class R1
Trading Symbol	MGRRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 1.80 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	1.80%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000071432 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class R2
Trading Symbol	MGRQX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 1.30 %
Expenses Paid, Amount	$ 67
Expense Ratio, Percent	1.30%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000071433 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class R3
Trading Symbol	MGRTX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 1.05 %
Expenses Paid, Amount	$ 54
Expense Ratio, Percent	1.05%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000071430 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class R4
Trading Symbol	MGRVX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 0.80 %
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.80%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000034484 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Growth Fund
Class Name	Class R6
Trading Symbol	MGRDX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.68 %
Expenses Paid, Amount	$ 35
Expense Ratio, Percent	0.68%
Net Assets	$ 17,084,862,478
Holdings Count | Holding	88
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 17,084,862,478 Portfolio Turnover Rate (%): 8 Total Number of Holdings: 88 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 98.5 % Money Market Funds 1.5 % Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 % Issuer country weightings France 14.9 % Germany 11.4 % Japan 10.4 % Switzerland 9.5 % United Kingdom 8.3 % Canada 7.3 % Taiwan 6.4 % Netherlands 4.2 % United States 4.1 % Other Countries 23.5 %
Largest Holdings [Text Block]	Top ten holdings SAP SE 4.9 % Schneider Electric SE 4.0 % Taiwan Semiconductor Manufacturing Co. Ltd. 3.8 % Hitachi Ltd. 3.7 % Roche Holding AG 3.2 % Nestle S.A. 3.1 % Linde PLC 2.6 % LVMH Moet Hennessy Louis Vuitton SE 2.3 % EssilorLuxottica 2.3 % Heineken N.V. 2.2 %
C000006941 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class A
Trading Symbol	MGIAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 1.01 %
Expenses Paid, Amount	$ 51
Expense Ratio, Percent	1.01%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000006942 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class B
Trading Symbol	MGIBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) B $ 1.76 %
Expenses Paid, Amount	$ 88
Expense Ratio, Percent	1.76%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000006943 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class C
Trading Symbol	MGICX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 1.76 %
Expenses Paid, Amount	$ 88
Expense Ratio, Percent	1.76%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000006944 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class I
Trading Symbol	MINIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 0.76 %
Expenses Paid, Amount	$ 38
Expense Ratio, Percent	0.76%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000071434 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class R1
Trading Symbol	MINRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 1.76 %
Expenses Paid, Amount	$ 88
Expense Ratio, Percent	1.76%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000071435 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class R2
Trading Symbol	MINFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 1.26 %
Expenses Paid, Amount	$ 63
Expense Ratio, Percent	1.26%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000071436 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class R3
Trading Symbol	MINGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 1.01 %
Expenses Paid, Amount	$ 51
Expense Ratio, Percent	1.01%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000071437 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class R4
Trading Symbol	MINHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 0.76 %
Expenses Paid, Amount	$ 38
Expense Ratio, Percent	0.76%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000034485 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Intrinsic Value Fund
Class Name	Class R6
Trading Symbol	MINJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.66 %
Expenses Paid, Amount	$ 33
Expense Ratio, Percent	0.66%
Net Assets	$ 21,681,708,653
Holdings Count | Holding	91
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 21,681,708,653 Portfolio Turnover Rate (%): 7 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 96.4 % Money Market Funds 3.6 % Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 % Issuer country weightings United Kingdom 18.0 % France 15.8 % Japan 13.6 % United States 10.9 % Germany 7.8 % Switzerland 7.1 % Canada 5.1 % Ireland 4.2 % Spain 4.0 % Other Countries 13.5 %
Largest Holdings [Text Block]	Top ten holdings Taiwan Semiconductor Manufacturing Co. Ltd., ADR 3.3 % Schneider Electric SE 3.1 % NatWest Group PLC 3.0 % Franco-Nevada Corp. 2.8 % TotalEnergies SE 2.7 % Resona Holdings, Inc. 2.4 % Legrand S.A. 2.4 % Deutsche Boerse AG 2.3 % SAP SE 2.2 % AIB Group PLC 2.1 %
C000142775 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class A
Trading Symbol	MNWAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ A $ 0.92 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 47	[46]
Expense Ratio, Percent	0.92%	[46]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000142776 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class B
Trading Symbol	MNWBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ B $ 1.67 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 85	[47]
Expense Ratio, Percent	1.67%	[47]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000142777 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class C
Trading Symbol	MNWCX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ C $ 1.67 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 85	[48]
Expense Ratio, Percent	1.67%	[48]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000142778 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class I
Trading Symbol	MNWIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ I $ 0.67 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 34	[49]
Expense Ratio, Percent	0.67%	[49]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000142779 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class R1
Trading Symbol	MNWRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R1 $ 1.67 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 85	[50]
Expense Ratio, Percent	1.67%	[50]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000142780 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class R2
Trading Symbol	MNWSX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R2 $ 1.17 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 59	[51]
Expense Ratio, Percent	1.17%	[51]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000142781 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class R3
Trading Symbol	MNWTX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R3 $ 0.92 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 47	[52]
Expense Ratio, Percent	0.92%	[52]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000142782 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class R4
Trading Symbol	MNWUX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R4 $ 0.67 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 34	[53]
Expense Ratio, Percent	0.67%	[53]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000195688 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Managed Wealth Fund
Class Name	Class R6
Trading Symbol	MNWZX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment ~ Costs paid as a percentage of a $10,000 investment (annualized) ~ R6 $ 0.60 % ˜ Expenses are direct expenses and do not include underlying fund fees and expenses.
Expenses Paid, Amount	$ 30	[54]
Expense Ratio, Percent	0.60%	[54]
Net Assets	$ 33,122,985
Holdings Count | Holding	15
Investment Company Portfolio Turnover	1%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 33,122,985 Portfolio Turnover Rate (%): 1 Total Number of Holdings: 15
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL NET ASSETS AS OF 11/30/24) Portfolio structure Active Derivative Net Market Strategic Allocation MFS Growth Fund 30.3 % MFS International Equity Fund 30.3 % MFS Value Fund 30.3 % Market Exposure Overlay Mini Russell 1000 Value Index Future DEC 20 24 (14.0 ) % Mini MSCI EAFE Index Future MAR 21 25 (14.1 ) % Mini Russell 1000 Growth Future DEC 20 24 (23.1 ) % Net Equity Exposure 39.7 % Standard & Poor's 500 Index Option 4200.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4400.00 PUT DEC 20 24 (0.0 ) % Standard & Poor's 500 Index Option 4900.00 PUT JUN 20 25 (0.4 ) % Standard & Poor's 500 Index Option 4600.00 PUT SEP 19 25 (0.4 ) % Standard & Poor's 500 Index Option 5450.00 PUT MAR 21 25 (0.5 ) % Standard & Poors Index Option PUT(s) (1.3 ) % Downside Hedge(s) (1.3 ) % Net Equivalent Equity Exposure 90.9 % (52.5 ) % 38.4 % Limited Maturity U.S. Treasury Notes 3.5 % Cash Cash & Cash Equivalents (d) 5.5 % Other (e) 52.6 % Total Net Exposure Summary 100.0 % (a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
Exposure Basis Explanation [Text Block]	(a) Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time. (b) Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions. (c) For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts. (d) Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities. (e) Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions. Portfolio Composition presents the value of securities, including equivalent exposure of derivative positions. Equivalent exposure is a reasonable approximation of the amount of the underlying asset the portfolio would have to hold to have the same price sensitivity of the derivative contract. Bonds include any accrued interest amounts. Where the fund holds convertible bonds, they are treated as part of the equity portion of the portfolio.
C000160020 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class A
Trading Symbol	BRWAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 0.74 %
Expenses Paid, Amount	$ 40
Expense Ratio, Percent	0.74%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160021 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class B
Trading Symbol	BRWBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) B $ 1.49 %
Expenses Paid, Amount	$ 81
Expense Ratio, Percent	1.49%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160022 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class C
Trading Symbol	BRWCX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 1.49 %
Expenses Paid, Amount	$ 81
Expense Ratio, Percent	1.49%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160023 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class I
Trading Symbol	BRWJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 0.49 %
Expenses Paid, Amount	$ 27
Expense Ratio, Percent	0.49%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160024 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class R1
Trading Symbol	BRWRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 1.49 %
Expenses Paid, Amount	$ 81
Expense Ratio, Percent	1.49%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160025 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class R2
Trading Symbol	BRWSX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 0.99 %
Expenses Paid, Amount	$ 54
Expense Ratio, Percent	0.99%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160026 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class R3
Trading Symbol	BRWTX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 0.74 %
Expenses Paid, Amount	$ 40
Expense Ratio, Percent	0.74%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160027 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class R4
Trading Symbol	BRWUX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 0.49 %
Expenses Paid, Amount	$ 27
Expense Ratio, Percent	0.49%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160028 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Growth Equity Fund
Class Name	Class R6
Trading Symbol	BRWVX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.42 %
Expenses Paid, Amount	$ 23
Expense Ratio, Percent	0.42%
Net Assets	$ 390,772,112
Holdings Count | Holding	73
Investment Company Portfolio Turnover	24%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 390,772,112 Portfolio Turnover Rate (%): 24 Total Number of Holdings: 73 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.2 % Money Market Funds 0.8 % Equity sectors Information Technology 48.8 % Consumer Discretionary 13.9 % Communication Services 13.3 % Health Care 7.8 % Financials 6.5 % Industrials 3.5 % Consumer Staples 2.4 % Real Estate 1.4 % Utilities 1.2 % Materials 0.4 % Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings NVIDIA Corp. 12.0 % Apple, Inc. 10.9 % Microsoft Corp. 9.7 % Amazon.com, Inc. 6.9 % Meta Platforms, Inc., "A" 4.5 % Alphabet, Inc., "A" 4.3 % Alphabet, Inc., "C" 2.8 % ServiceNow, Inc. 2.0 % AppLovin Corp. 2.0 % Booking Holdings, Inc. 1.7 %
C000160029 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research®Small Cap Equity Fund
Class Name	Class A
Trading Symbol	BRSDX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 0.99 %
Expenses Paid, Amount	$ 53
Expense Ratio, Percent	0.99%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160030 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class B
Trading Symbol	BRSBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) B $ 1.74 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	1.74%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160031 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class C
Trading Symbol	BRSHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 1.74 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	1.74%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160032 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class I
Trading Symbol	BRSJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 0.74 %
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.74%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160033 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class R1
Trading Symbol	BRSPX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 1.74 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	1.74%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160034 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class R2
Trading Symbol	BRSSX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 1.24 %
Expenses Paid, Amount	$ 66
Expense Ratio, Percent	1.24%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160035 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class R3
Trading Symbol	BRSTX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 0.99 %
Expenses Paid, Amount	$ 53
Expense Ratio, Percent	0.99%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160036 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class R4
Trading Symbol	BRSUX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 0.74 %
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.74%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160037 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Small Cap Equity Fund
Class Name	Class R6
Trading Symbol	BRSYX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.63 %
Expenses Paid, Amount	$ 34
Expense Ratio, Percent	0.63%
Net Assets	$ 364,265,504
Holdings Count | Holding	183
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 364,265,504 Portfolio Turnover Rate (%): 32 Total Number of Holdings: 183 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.3 % Money Market Funds 0.7 % Equity sectors Financials 20.4 % Health Care 17.6 % Industrials 15.9 % Information Technology 12.8 % Consumer Discretionary 11.1 % Energy 5.4 % Real Estate 5.2 % Materials 5.0 % Communication Services 2.9 % Utilities 1.6 % Consumer Staples 1.4 % Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Prestige Consumer Healthcare, Inc. 1.7 % Newell Brands, Inc. 1.7 % Encompass Health Corp. 1.6 % SLM Corp. 1.5 % Columbia Banking System, Inc. 1.5 % Armstrong World Industries, Inc. 1.5 % Piedmont Office Realty Trust, Inc., REIT 1.5 % Element Solutions, Inc. 1.4 % Grand Canyon Education, Inc. 1.4 % Cathay General Bancorp, Inc. 1.4 %
C000160038 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class A
Trading Symbol	BRUDX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 0.74 %
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.74%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160039 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class B
Trading Symbol	BRUEX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) B $ 1.49 %
Expenses Paid, Amount	$ 78
Expense Ratio, Percent	1.49%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160040 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class C
Trading Symbol	BRUGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 1.49 %
Expenses Paid, Amount	$ 78
Expense Ratio, Percent	1.49%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160041 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class I
Trading Symbol	BRUHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 0.49 %
Expenses Paid, Amount	$ 26
Expense Ratio, Percent	0.49%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160042 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class R1
Trading Symbol	BRUJX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 0.74 %
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.74%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160043 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class R2
Trading Symbol	BRUKX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 0.99 %
Expenses Paid, Amount	$ 52
Expense Ratio, Percent	0.99%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160044 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class R3
Trading Symbol	BRULX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 0.74 %
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.74%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160045 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class R4
Trading Symbol	BRUMX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 0.49 %
Expenses Paid, Amount	$ 26
Expense Ratio, Percent	0.49%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000160046 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Value Equity Fund
Class Name	Class R6
Trading Symbol	BRUNX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.42 %
Expenses Paid, Amount	$ 22
Expense Ratio, Percent	0.42%
Net Assets	$ 303,323,916
Holdings Count | Holding	108
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 303,323,916 Portfolio Turnover Rate (%): 25 Total Number of Holdings: 108 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 22.4 % Health Care 15.2 % Industrials 14.0 % Information Technology 8.3 % Consumer Staples 8.1 % Energy 7.2 % Consumer Discretionary 6.2 % Utilities 5.2 % Real Estate 4.9 % Materials 4.1 % Communication Services 3.9 % Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings JPMorgan Chase & Co. 3.2 % Johnson & Johnson 2.6 % Wells Fargo & Co. 2.4 % NextEra Energy, Inc. 1.9 % Berkshire Hathaway, Inc., "B" 1.9 % Eaton Corp. PLC 1.8 % American Express Co. 1.8 % T-Mobile USA, Inc. 1.8 % Fiserv, Inc. 1.7 % Pfizer, Inc. 1.7 %
C000172715 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class A
Trading Symbol	BMSFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 0.84 %
Expenses Paid, Amount	$ 46
Expense Ratio, Percent	0.84%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172716 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class B
Trading Symbol	BMSBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) B $ 1.59 %
Expenses Paid, Amount	$ 86
Expense Ratio, Percent	1.59%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172717 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class C
Trading Symbol	BMSDX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 1.59 %
Expenses Paid, Amount	$ 86
Expense Ratio, Percent	1.59%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172718 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class I
Trading Symbol	BMSLX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 0.59 %
Expenses Paid, Amount	$ 32
Expense Ratio, Percent	0.59%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172719 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class R1
Trading Symbol	BMSRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 1.32 %
Expenses Paid, Amount	$ 72
Expense Ratio, Percent	1.32%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172720 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class R2
Trading Symbol	BMSSX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 1.09 %
Expenses Paid, Amount	$ 59
Expense Ratio, Percent	1.09%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172721 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class R3
Trading Symbol	BMSTX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 0.84 %
Expenses Paid, Amount	$ 46
Expense Ratio, Percent	0.84%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172722 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class R4
Trading Symbol	BMSVX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 0.59 %
Expenses Paid, Amount	$ 32
Expense Ratio, Percent	0.59%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000172723 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® Blended Research® Mid Cap Equity Fund
Class Name	Class R6
Trading Symbol	BMSYX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.48 %
Expenses Paid, Amount	$ 26
Expense Ratio, Percent	0.48%
Net Assets	$ 956,869,646
Holdings Count | Holding	147
Investment Company Portfolio Turnover	30%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 956,869,646 Portfolio Turnover Rate (%): 30 Total Number of Holdings: 147 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Financials 17.4 % Industrials 16.7 % Information Technology 12.7 % Consumer Discretionary 10.5 % Health Care 10.4 % Real Estate 7.8 % Utilities 7.3 % Energy 4.5 % Materials 4.4 % Communication Services 3.9 % Consumer Staples 3.5 % Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 % MFS uses the Global Industry Classification Standard (GICS ®
Largest Holdings [Text Block]	Top ten holdings Ameriprise Financial, Inc. 2.0 % M&T Bank Corp. 1.8 % Spotify Technology S.A. 1.7 % Vistra Corp. 1.6 % Wabtec Corp. 1.6 % AppLovin Corp. 1.6 % Hartford Financial Services Group, Inc. 1.6 % Veeva Systems, Inc. 1.6 % Datadog, Inc., "A" 1.5 % Verisk Analytics, Inc., "A" 1.5 %
C000220109 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class A
Trading Symbol	MKVBX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) A $ 0.95 %
Expenses Paid, Amount	$ 48
Expense Ratio, Percent	0.95%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
C000220112 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class C
Trading Symbol	MKVCX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) C $ 1.70 %
Expenses Paid, Amount	$ 86
Expense Ratio, Percent	1.70%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
C000220111 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class I
Trading Symbol	MKVIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) I $ 0.70 %
Expenses Paid, Amount	$ 35
Expense Ratio, Percent	0.70%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
C000220110 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class R1
Trading Symbol	MKVDX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R1 $ 1.70 %
Expenses Paid, Amount	$ 86
Expense Ratio, Percent	1.70%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
C000220113 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class R2
Trading Symbol	MKVEX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R2 $ 1.20 %
Expenses Paid, Amount	$ 61
Expense Ratio, Percent	1.20%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
C000220108 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class R3
Trading Symbol	MKVFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R3 $ 0.95 %
Expenses Paid, Amount	$ 48
Expense Ratio, Percent	0.95%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
C000220107 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class R4
Trading Symbol	MKVGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R4 $ 0.70 %
Expenses Paid, Amount	$ 35
Expense Ratio, Percent	0.70%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
C000220106 [Member]
Shareholder Report [Line Items]
Fund Name	MFS® International Large Cap Value Fund
Class Name	Class R6
Trading Symbol	MKVHX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at funds.mfs.com
Additional Information Phone Number	1‑800‑225‑2606
Additional Information Email	orderliterature@mfs.com
Additional Information Website	funds.mfs.com
Expenses [Text Block]	FUND EXPENSES What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment (annualized) R6 $ 0.67 %
Expenses Paid, Amount	$ 34
Expense Ratio, Percent	0.67%
Net Assets	$ 6,341,261,579
Holdings Count | Holding	91
Investment Company Portfolio Turnover	12%
Additional Fund Statistics [Text Block]	FUND STATISTICS AS OF 11/30/24 Net Assets ($): 6,341,261,579 Portfolio Turnover Rate (%): 12 Total Number of Holdings: 91 Where the fund holds derivatives, they are not included in the total number of portfolio holdings.
Holdings [Text Block]	PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 11/30/24) Portfolio structure Equities 97.6 % Money Market Funds 2.4 % Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 % Issuer country weightings United Kingdom 27.2 % Japan 16.7 % France 14.7 % Switzerland 8.7 % Germany 6.3 % United States 5.7 % Canada 5.5 % Ireland 3.5 % Spain 2.9 % Other Countries 8.8 %
Largest Holdings [Text Block]	Top ten holdings NatWest Group PLC 4.1 % Mitsubishi UFJ Financial Group, Inc. 3.7 % UBS Group AG 3.0 % Roche Holding AG 2.7 % Willis Towers Watson PLC 2.6 % BNP Paribas S.A. 2.2 % Schneider Electric SE 2.1 % Sanofi 2.1 % National Grid PLC 2.1 % TotalEnergies SE 2.0 %
[1]Expenses are direct expenses and do not include underlying fund fees and expenses.[2]Expenses are direct expenses and do not include underlying fund fees and expenses.[3]Expenses are direct expenses and do not include underlying fund fees and expenses.[4]Expenses are direct expenses and do not include underlying fund fees and expenses.[5]Expenses are direct expenses and do not include underlying fund fees and expenses.[6]Expenses are direct expenses and do not include underlying fund fees and expenses.[7]Expenses are direct expenses and do not include underlying fund fees and expenses.[8]Expenses are direct expenses and do not include underlying fund fees and expenses.[9]Expenses are direct expenses and do not include underlying fund fees and expenses.[10]Expenses are direct expenses and do not include underlying fund fees and expenses.[11]Expenses are direct expenses and do not include underlying fund fees and expenses.[12]Expenses are direct expenses and do not include underlying fund fees and expenses.[13]Expenses are direct expenses and do not include underlying fund fees and expenses.[14]Expenses are direct expenses and do not include underlying fund fees and expenses.[15]Expenses are direct expenses and do not include underlying fund fees and expenses.[16]Expenses are direct expenses and do not include underlying fund fees and expenses.[17]Expenses are direct expenses and do not include underlying fund fees and expenses.[18]Expenses are direct expenses and do not include underlying fund fees and expenses.[19]Expenses are direct expenses and do not include underlying fund fees and expenses.[20]Expenses are direct expenses and do not include underlying fund fees and expenses.[21]Expenses are direct expenses and do not include underlying fund fees and expenses.[22]Expenses are direct expenses and do not include underlying fund fees and expenses.[23]Expenses are direct expenses and do not include underlying fund fees and expenses.[24]Expenses are direct expenses and do not include underlying fund fees and expenses.[25]Expenses are direct expenses and do not include underlying fund fees and expenses.[26]Expenses are direct expenses and do not include underlying fund fees and expenses.[27]Expenses are direct expenses and do not include underlying fund fees and expenses.[28]Expenses are direct expenses and do not include underlying fund fees and expenses.[29]Expenses are direct expenses and do not include underlying fund fees and expenses.[30]Expenses are direct expenses and do not include underlying fund fees and expenses.[31]Expenses are direct expenses and do not include underlying fund fees and expenses.[32]Expenses are direct expenses and do not include underlying fund fees and expenses.[33]Expenses are direct expenses and do not include underlying fund fees and expenses.[34]Expenses are direct expenses and do not include underlying fund fees and expenses.[35]Expenses are direct expenses and do not include underlying fund fees and expenses.[36]Expenses are direct expenses and do not include underlying fund fees and expenses.[37]Expenses are direct expenses and do not include underlying fund fees and expenses.[38]Expenses are direct expenses and do not include underlying fund fees and expenses.[39]Expenses are direct expenses and do not include underlying fund fees and expenses.[40]Expenses are direct expenses and do not include underlying fund fees and expenses.[41]Expenses are direct expenses and do not include underlying fund fees and expenses.[42]Expenses are direct expenses and do not include underlying fund fees and expenses.[43]Expenses are direct expenses and do not include underlying fund fees and expenses.[44]Expenses are direct expenses and do not include underlying fund fees and expenses.[45]Expenses are direct expenses and do not include underlying fund fees and expenses.[46]Expenses are direct expenses and do not include underlying fund fees and expenses.[47]Expenses are direct expenses and do not include underlying fund fees and expenses.[48]Expenses are direct expenses and do not include underlying fund fees and expenses.[49]Expenses are direct expenses and do not include underlying fund fees and expenses.[50]Expenses are direct expenses and do not include underlying fund fees and expenses.[51]Expenses are direct expenses and do not include underlying fund fees and expenses.[52]Expenses are direct expenses and do not include underlying fund fees and expenses.[53]Expenses are direct expenses and do not include underlying fund fees and expenses.[54]Expenses are direct expenses and do not include underlying fund fees and expenses.

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Nov. 30, 2024
C000006838 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006838 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006838 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006838 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006838 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006838 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006838 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006838 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006838 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006838 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006838 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006838 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006838 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006838 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006838 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006838 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006838 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006838 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006838 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006838 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006843 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006843 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006843 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006843 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006843 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006843 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006843 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006843 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006843 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006843 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006843 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006843 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006843 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006843 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006843 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006843 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006843 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006843 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006843 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006843 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006844 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006844 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006844 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006844 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006844 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006844 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006844 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006844 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006844 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006844 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006844 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006844 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006844 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006844 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006844 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006844 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006844 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006844 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006844 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006844 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006845 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006845 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006845 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006845 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006845 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006845 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006845 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006845 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006845 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006845 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006845 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006845 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006845 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006845 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006845 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006845 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006845 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006845 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006845 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006845 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006847 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006847 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006847 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006847 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006847 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006847 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006847 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006847 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006847 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006847 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006847 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006847 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006847 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006847 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006847 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006847 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006847 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006847 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006847 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006847 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006849 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006849 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006849 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006849 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006849 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006849 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006849 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006849 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006849 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006849 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006849 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006849 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006849 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006849 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006849 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006849 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006849 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006849 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006849 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006849 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006850 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006850 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006850 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006850 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006850 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006850 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006850 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006850 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006850 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006850 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006850 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006850 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006850 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006850 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006850 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006850 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006850 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006850 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006850 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006850 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006839 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000006839 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000006839 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000006839 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006839 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000006839 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006839 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006839 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006839 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006839 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006839 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006839 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006839 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006839 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006839 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006839 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006839 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000006839 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000006839 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006839 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000231058 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000231058 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	11.20%
C000231058 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.20%
C000231058 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000231058 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10.10%
C000231058 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000231058 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231058 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231058 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231058 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231058 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231058 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231058 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000231058 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000231058 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000231058 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000231058 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	58.60%
C000231058 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	29.90%
C000231058 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000231058 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006851 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006851 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006851 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006851 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006851 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006851 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006851 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006851 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006851 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006851 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006851 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006851 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006851 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006851 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006851 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006851 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006851 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006851 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006851 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006851 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006851 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006851 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006851 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006851 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006851 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006851 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006851 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006851 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006856 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006856 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006856 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006856 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006856 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006856 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006856 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006856 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006856 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006856 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006856 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006856 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006856 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006856 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006856 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006856 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006856 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006856 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006856 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006856 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006856 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006856 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006856 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006856 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006856 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006856 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006856 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006856 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006857 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006857 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006857 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006857 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006857 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006857 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006857 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006857 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006857 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006857 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006857 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006857 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006857 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006857 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006857 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006857 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006857 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006857 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006857 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006857 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006857 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006857 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006857 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006857 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006857 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006857 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006857 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006857 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006858 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006858 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006858 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006858 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006858 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006858 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006858 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006858 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006858 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006858 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006858 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006858 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006858 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006858 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006858 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006858 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006858 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006858 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006858 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006858 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006858 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006858 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006858 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006858 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006858 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006858 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006858 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006858 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006860 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006860 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006860 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006860 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006860 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006860 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006860 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006860 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006860 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006860 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006860 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006860 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006860 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006860 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006860 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006860 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006860 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006860 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006860 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006860 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006860 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006860 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006860 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006860 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006860 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006860 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006860 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006860 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006862 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006862 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006862 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006862 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006862 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006862 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006862 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006862 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006862 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006862 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006862 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006862 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006862 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006862 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006862 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006862 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006862 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006862 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006862 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006862 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006862 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006862 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006862 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006862 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006862 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006862 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006862 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006862 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006863 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006863 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006863 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006863 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006863 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006863 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006863 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006863 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006863 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006863 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006863 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006863 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006863 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006863 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006863 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006863 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006863 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006863 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006863 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006863 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006863 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006863 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006863 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006863 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006863 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006863 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006863 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006863 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006852 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006852 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006852 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000006852 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006852 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006852 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006852 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006852 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006852 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006852 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006852 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006852 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006852 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000006852 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006852 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006852 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006852 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006852 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000006852 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006852 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006852 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006852 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006852 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006852 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000006852 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000006852 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006852 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006852 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000231059 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000231059 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000231059 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000231059 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000231059 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7.10%
C000231059 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231059 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231059 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231059 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231059 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231059 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231059 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000231059 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000231059 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000231059 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000231059 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000231059 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000231059 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	8.50%
C000231059 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000231059 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231059 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231059 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231059 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231059 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	39.60%
C000231059 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	12.90%
C000231059 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000231059 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000231059 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	39%
C000006887 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006887 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006887 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006887 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006887 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006887 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006887 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006887 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006887 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006887 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006887 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006887 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006887 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006887 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006887 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006887 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006887 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006887 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006887 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006887 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006887 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006887 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006887 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006887 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006887 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006887 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006887 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006892 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006892 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006892 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006892 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006892 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006892 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006892 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006892 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006892 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006892 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006892 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006892 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006892 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006892 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006892 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006892 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006892 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006892 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006892 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006892 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006892 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006892 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006892 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006892 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006892 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006892 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006892 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006893 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006893 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006893 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006893 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006893 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006893 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006893 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006893 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006893 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006893 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006893 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006893 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006893 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006893 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006893 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006893 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006893 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006893 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006893 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006893 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006893 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006893 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006893 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006893 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006893 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006893 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006893 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006894 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006894 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006894 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006894 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006894 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006894 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006894 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006894 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006894 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006894 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006894 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006894 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006894 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006894 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006894 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006894 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006894 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006894 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006894 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006894 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006894 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006894 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006894 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006894 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006894 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006894 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006894 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006896 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006896 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006896 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006896 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006896 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006896 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006896 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006896 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006896 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006896 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006896 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006896 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006896 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006896 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006896 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006896 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006896 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006896 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006896 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006896 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006896 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006896 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006896 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006896 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006896 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006896 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006896 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006898 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006898 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006898 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006898 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006898 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006898 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006898 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006898 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006898 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006898 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006898 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006898 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006898 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006898 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006898 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006898 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006898 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006898 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006898 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006898 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006898 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006898 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006898 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006898 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006898 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006898 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006898 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006899 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006899 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006899 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006899 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006899 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006899 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006899 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006899 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006899 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006899 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006899 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006899 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006899 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006899 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006899 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006899 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006899 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006899 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006899 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006899 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006899 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006899 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006899 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006899 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006899 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006899 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006899 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006888 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000006888 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000006888 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000006888 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006888 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006888 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000006888 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006888 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006888 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006888 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006888 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006888 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006888 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000006888 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006888 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006888 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006888 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006888 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006888 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006888 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006888 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006888 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006888 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000006888 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006888 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006888 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006888 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000231060 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	6%
C000231060 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000231060 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5.30%
C000231060 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231060 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231060 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000231060 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231060 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231060 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000231060 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000231060 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000231060 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000231060 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1%
C000231060 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000231060 [Member] | MFS Government Securities Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000231060 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	14.50%
C000231060 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000231060 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000231060 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231060 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231060 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231060 [Member] | MFS Limited Maturity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000231060 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	26.50%
C000231060 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000231060 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231060 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000231060 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	59%
C000006904 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006904 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000006904 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006904 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006904 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006904 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006904 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006904 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000006904 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006904 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006904 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000006904 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000006904 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000006904 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006904 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000006904 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006904 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006904 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000006904 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006904 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000006904 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000006904 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000006905 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006905 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000006905 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006905 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006905 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006905 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006905 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006905 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000006905 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006905 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006905 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000006905 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000006905 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000006905 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006905 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000006905 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006905 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006905 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000006905 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006905 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000006905 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000006905 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000006906 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006906 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000006906 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006906 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006906 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006906 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006906 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006906 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000006906 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006906 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006906 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000006906 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000006906 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000006906 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006906 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000006906 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006906 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006906 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000006906 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006906 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000006906 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000006906 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000006907 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006907 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000006907 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006907 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006907 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006907 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006907 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006907 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000006907 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006907 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000006907 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000006907 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000006907 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000006907 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000006907 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000006907 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006907 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000006907 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000006907 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006907 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000006907 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000006907 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000071424 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071424 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000071424 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000071424 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071424 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071424 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071424 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000071424 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000071424 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071424 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071424 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000071424 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000071424 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000071424 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000071424 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000071424 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071424 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000071424 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000071424 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071424 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000071424 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000071424 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000071425 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071425 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000071425 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000071425 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071425 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071425 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071425 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000071425 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000071425 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071425 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071425 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000071425 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000071425 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000071425 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000071425 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000071425 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071425 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000071425 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000071425 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071425 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000071425 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000071425 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000071426 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071426 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000071426 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000071426 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071426 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071426 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071426 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000071426 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000071426 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071426 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071426 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000071426 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000071426 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000071426 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000071426 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000071426 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071426 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000071426 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000071426 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071426 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000071426 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000071426 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000071427 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071427 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000071427 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000071427 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071427 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071427 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071427 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000071427 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000071427 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071427 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071427 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000071427 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000071427 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000071427 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000071427 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000071427 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071427 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000071427 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000071427 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071427 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000071427 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000071427 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000071428 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071428 [Member] | Tencent Holdings Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	5.90%
C000071428 [Member] | Samsung Electronics Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000071428 [Member] | Alibaba Group Holding Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071428 [Member] | Infosys Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071428 [Member] | Tata Consultancy Services Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071428 [Member] | China Construction Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000071428 [Member] | HDFC Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000071428 [Member] | Kweichow Moutai Co Ltd A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071428 [Member] | Kotak Mahindra Bank Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000071428 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	14.20%
C000071428 [Member] | CHINA
Holdings [Line Items]
Percent of Total Investments	26.10%
C000071428 [Member] | INDIA
Holdings [Line Items]
Percent of Total Investments	16%
C000071428 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	14.50%
C000071428 [Member] | KOREA, REPUBLIC OF
Holdings [Line Items]
Percent of Total Investments	12.70%
C000071428 [Member] | INDONESIA
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071428 [Member] | MEXICO
Holdings [Line Items]
Percent of Total Investments	2.90%
C000071428 [Member] | BRAZIL
Holdings [Line Items]
Percent of Total Investments	5.70%
C000071428 [Member] | THAILAND
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071428 [Member] | HONG KONG
Holdings [Line Items]
Percent of Total Investments	2%
C000071428 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.30%
C000071428 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.70%
C000006911 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006911 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006911 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006911 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006911 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006911 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006911 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006911 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006911 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006911 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006911 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006911 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006911 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006911 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006911 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006911 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006911 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006911 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006911 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006911 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006911 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006911 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006911 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006911 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006911 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006911 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006911 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006916 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006916 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006916 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006916 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006916 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006916 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006916 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006916 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006916 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006916 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006916 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006916 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006916 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006916 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006916 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006916 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006916 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006916 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006916 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006916 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006916 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006916 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006916 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006916 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006916 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006916 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006916 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006917 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006917 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006917 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006917 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006917 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006917 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006917 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006917 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006917 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006917 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006917 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006917 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006917 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006917 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006917 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006917 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006917 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006917 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006917 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006917 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006917 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006917 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006917 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006917 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006917 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006917 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006917 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006918 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006918 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006918 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006918 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006918 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006918 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006918 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006918 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006918 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006918 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006918 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006918 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006918 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006918 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006918 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006918 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006918 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006918 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006918 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006918 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006918 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006918 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006918 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006918 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006918 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006918 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006918 [Member] | Bond Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006920 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006920 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006920 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006920 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006920 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006920 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006920 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006920 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006920 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006920 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006920 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006920 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006920 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006920 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006920 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006920 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006920 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006920 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006920 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006920 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006920 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006920 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006920 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006920 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006920 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006920 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006920 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006922 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006922 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006922 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006922 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006922 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006922 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006922 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006922 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006922 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006922 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006922 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006922 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006922 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006922 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006922 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006922 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006922 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006922 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006922 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006922 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006922 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006922 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006922 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006922 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006922 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006922 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006922 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006923 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006923 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006923 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006923 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006923 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006923 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006923 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006923 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006923 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006923 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006923 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006923 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006923 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006923 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006923 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006923 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006923 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006923 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006923 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006923 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006923 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006923 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006923 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006923 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006923 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006923 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006923 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006912 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006912 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006912 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006912 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000006912 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000006912 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000006912 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006912 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006912 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006912 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006912 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006912 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006912 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000006912 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006912 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006912 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006912 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000006912 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000006912 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006912 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000006912 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006912 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006912 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000006912 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000006912 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000006912 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000006912 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000231061 [Member] | MFS Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000231061 [Member] | MFS Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000231061 [Member] | MFS Research Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000231061 [Member] | MFS Mid Cap Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.20%
C000231061 [Member] | MFS Mid Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	9.10%
C000231061 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	7%
C000231061 [Member] | MFS Global Real Estate Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231061 [Member] | MFS Commodity Strategy Fund [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000231061 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231061 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231061 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231061 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231061 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000231061 [Member] | MFS New Discovery Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231061 [Member] | MFS New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231061 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231061 [Member] | MFS Total Return Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2.50%
C000231061 [Member] | MFS Inflation Adjusted Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000231061 [Member] | MFS Global Opportunistic Bond Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231061 [Member] | MFS High Income Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000231061 [Member] | MFS Emerging Markets Debt Fund [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000231061 [Member] | MFS Emerging Markets Debt Local Currency Fund [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231061 [Member] | U S Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	50.70%
C000231061 [Member] | International Stock Funds [Member]
Holdings [Line Items]
Percent of Total Investments	19.90%
C000231061 [Member] | Non Traditional Funds [Member]
Holdings [Line Items]
Percent of Total Investments	8%
C000231061 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000231061 [Member] | Bonds [Member]
Holdings [Line Items]
Percent of Total Investments	19.40%
C000006924 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006924 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006924 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006924 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006924 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006924 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006924 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006924 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006924 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006924 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006929 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006929 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006929 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006929 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006929 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006929 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006929 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006929 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006929 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006929 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006930 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006930 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006930 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006930 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006930 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006930 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006930 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006930 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006930 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006930 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006931 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006931 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006931 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006931 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006931 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006931 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006931 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006931 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006931 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006931 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006933 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006933 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006933 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006933 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006933 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006933 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006933 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006933 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006933 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006933 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006935 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006935 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006935 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006935 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006935 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006935 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006935 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006935 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006935 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006935 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006936 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006936 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006936 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006936 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006936 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006936 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006936 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006936 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006936 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006936 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006925 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000006925 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006925 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006925 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000006925 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000006925 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000006925 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006925 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000006925 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000006925 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000195683 [Member] | MFS Research International Fund [Member]
Holdings [Line Items]
Percent of Total Investments	27.60%
C000195683 [Member] | MFS International Intrinsic Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000195683 [Member] | MFS International Large Cap Value Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000195683 [Member] | MFS International Growth Fund [Member]
Holdings [Line Items]
Percent of Total Investments	15%
C000195683 [Member] | MFS International New Discovery Fund [Member]
Holdings [Line Items]
Percent of Total Investments	10%
C000195683 [Member] | MFS Emerging Markets Equity Fund [Member]
Holdings [Line Items]
Percent of Total Investments	17.20%
C000195683 [Member] | MFS Institutional Money Market Portfolio [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000195683 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.20%
C000195683 [Member] | International Stock Funds Target Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	100%
C000195683 [Member] | International Stock Funds Actual Allocation [Member]
Holdings [Line Items]
Percent of Total Investments	99.80%
C000006937 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000006937 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000006937 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006937 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006937 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006937 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006937 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006937 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006937 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006937 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006937 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000006937 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000006937 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000006937 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000006937 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000006937 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006937 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000006937 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000006937 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006937 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000006937 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006937 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000006938 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000006938 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000006938 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006938 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006938 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006938 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006938 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006938 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006938 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006938 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006938 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000006938 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000006938 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000006938 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000006938 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000006938 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006938 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000006938 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000006938 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006938 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000006938 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006938 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000006939 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000006939 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000006939 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006939 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006939 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006939 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006939 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006939 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006939 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006939 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006939 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000006939 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000006939 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000006939 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000006939 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000006939 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006939 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000006939 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000006939 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006939 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000006939 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006939 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000006940 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000006940 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000006940 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000006940 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000006940 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000006940 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006940 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000006940 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006940 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006940 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006940 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000006940 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000006940 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000006940 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000006940 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000006940 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000006940 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000006940 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000006940 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006940 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000006940 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000006940 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000071431 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000071431 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000071431 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000071431 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071431 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071431 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071431 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071431 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071431 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071431 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071431 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000071431 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000071431 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000071431 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000071431 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000071431 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071431 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000071431 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000071431 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071431 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000071431 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000071431 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000071432 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000071432 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000071432 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000071432 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071432 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071432 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071432 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071432 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071432 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071432 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071432 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000071432 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000071432 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000071432 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000071432 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000071432 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071432 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000071432 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000071432 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071432 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000071432 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000071432 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000071433 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000071433 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000071433 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000071433 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071433 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071433 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071433 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071433 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071433 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071433 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071433 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000071433 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000071433 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000071433 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000071433 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000071433 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071433 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000071433 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000071433 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071433 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000071433 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000071433 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000071430 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000071430 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000071430 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000071430 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000071430 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000071430 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071430 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000071430 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071430 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071430 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071430 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000071430 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000071430 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000071430 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000071430 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000071430 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000071430 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000071430 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000071430 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071430 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000071430 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000071430 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000034484 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.80%
C000034484 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000034484 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	4%
C000034484 [Member] | Hitachi Ltd [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000034484 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000034484 [Member] | Nestle S A [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000034484 [Member] | Linde PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000034484 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000034484 [Member] | EssilorLuxottica [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000034484 [Member] | Heineken N V [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000034484 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	23.50%
C000034484 [Member] | TAIWAN
Holdings [Line Items]
Percent of Total Investments	6.40%
C000034484 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.90%
C000034484 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	11.40%
C000034484 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	10.40%
C000034484 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	9.50%
C000034484 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	8.30%
C000034484 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	7.30%
C000034484 [Member] | NETHERLANDS
Holdings [Line Items]
Percent of Total Investments	4.20%
C000034484 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	4.10%
C000034484 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000034484 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	98.50%
C000006941 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006941 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006941 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006941 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000006941 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000006941 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006941 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006941 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006941 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006941 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000006941 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000006941 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000006941 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000006941 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000006941 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006941 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000006941 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000006941 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000006941 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006941 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000006941 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000006941 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000006942 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006942 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006942 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006942 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000006942 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000006942 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006942 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006942 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006942 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006942 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000006942 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000006942 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000006942 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000006942 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000006942 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006942 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000006942 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000006942 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000006942 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006942 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000006942 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000006942 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000006943 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006943 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006943 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006943 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000006943 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000006943 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006943 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006943 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006943 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006943 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000006943 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000006943 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000006943 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000006943 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000006943 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006943 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000006943 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000006943 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000006943 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006943 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000006943 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000006943 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000006944 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000006944 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000006944 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000006944 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000006944 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000006944 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006944 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000006944 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000006944 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000006944 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000006944 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000006944 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000006944 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000006944 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000006944 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000006944 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000006944 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000006944 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000006944 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000006944 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000006944 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000006944 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000071434 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071434 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071434 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000071434 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000071434 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000071434 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071434 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071434 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071434 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071434 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000071434 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000071434 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000071434 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000071434 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000071434 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000071434 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000071434 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000071434 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000071434 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071434 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000071434 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000071434 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000071435 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071435 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071435 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000071435 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000071435 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000071435 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071435 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071435 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071435 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071435 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000071435 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000071435 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000071435 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000071435 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000071435 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000071435 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000071435 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000071435 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000071435 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071435 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000071435 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000071435 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000071436 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071436 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071436 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000071436 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000071436 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000071436 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071436 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071436 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071436 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071436 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000071436 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000071436 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000071436 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000071436 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000071436 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000071436 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000071436 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000071436 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000071436 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071436 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000071436 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000071436 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000071437 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000071437 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000071437 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000071437 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000071437 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000071437 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071437 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000071437 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000071437 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000071437 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000071437 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000071437 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000071437 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000071437 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000071437 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000071437 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000071437 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000071437 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000071437 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000071437 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000071437 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000071437 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000034485 [Member] | SAP SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000034485 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	3.10%
C000034485 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000034485 [Member] | Franco Nevada Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000034485 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000034485 [Member] | Resona Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000034485 [Member] | Legrand S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000034485 [Member] | Deutsche Boerse AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.30%
C000034485 [Member] | AIB Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000034485 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member]
Holdings [Line Items]
Percent of Total Investments	3.30%
C000034485 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	13.50%
C000034485 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	15.80%
C000034485 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	7.80%
C000034485 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	13.60%
C000034485 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	7.10%
C000034485 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	18%
C000034485 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.10%
C000034485 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	10.90%
C000034485 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	4.20%
C000034485 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	4%
C000034485 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	3.60%
C000034485 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	96.40%
C000142775 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[1]
C000142775 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[2]
C000142775 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[2]
C000142775 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[2]
C000142775 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[3]
C000142775 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[3]
C000142775 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[3]
C000142775 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[3]
C000142775 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[3]
C000142775 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[3]
C000142775 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[3]
C000142775 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[3]
C000142775 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[1],[4]
C000142775 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[1],[5]
C000142775 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[1]
C000142775 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[1]
C000142775 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[1]
C000142775 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[1]
C000142775 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[1]
C000142775 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142775 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000142776 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[6]
C000142776 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[7]
C000142776 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[7]
C000142776 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[7]
C000142776 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[8]
C000142776 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[8]
C000142776 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[8]
C000142776 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[8]
C000142776 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[8]
C000142776 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[8]
C000142776 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[8]
C000142776 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[8]
C000142776 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[6],[9]
C000142776 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[6],[10]
C000142776 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[6]
C000142776 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[6]
C000142776 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[6]
C000142776 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[6]
C000142776 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[6]
C000142776 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142776 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000142777 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[11]
C000142777 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[12]
C000142777 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[12]
C000142777 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[12]
C000142777 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[13]
C000142777 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[13]
C000142777 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[13]
C000142777 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[13]
C000142777 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[13]
C000142777 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[13]
C000142777 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[13]
C000142777 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[13]
C000142777 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[11],[14]
C000142777 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[11],[15]
C000142777 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[11]
C000142777 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[11]
C000142777 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[11]
C000142777 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[11]
C000142777 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[11]
C000142777 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142777 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000142778 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[16]
C000142778 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[17]
C000142778 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[17]
C000142778 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[17]
C000142778 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[18]
C000142778 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[18]
C000142778 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[18]
C000142778 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[18]
C000142778 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[18]
C000142778 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[18]
C000142778 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[18]
C000142778 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[18]
C000142778 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[16],[19]
C000142778 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[16],[20]
C000142778 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[16]
C000142778 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[16]
C000142778 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[16]
C000142778 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[16]
C000142778 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[16]
C000142778 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142778 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000142779 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[21]
C000142779 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[22]
C000142779 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[22]
C000142779 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[22]
C000142779 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[23]
C000142779 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[23]
C000142779 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[23]
C000142779 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[23]
C000142779 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[23]
C000142779 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[23]
C000142779 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[23]
C000142779 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[23]
C000142779 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[21],[24]
C000142779 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[21],[25]
C000142779 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[21]
C000142779 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[21]
C000142779 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[21]
C000142779 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[21]
C000142779 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[21]
C000142779 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142779 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000142780 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[26]
C000142780 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[27]
C000142780 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[27]
C000142780 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[27]
C000142780 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[28]
C000142780 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[28]
C000142780 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[28]
C000142780 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[28]
C000142780 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[28]
C000142780 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[28]
C000142780 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[28]
C000142780 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[28]
C000142780 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[26],[29]
C000142780 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[26],[30]
C000142780 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[26]
C000142780 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[26]
C000142780 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[26]
C000142780 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[26]
C000142780 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[26]
C000142780 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142780 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000142781 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[31]
C000142781 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[32]
C000142781 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[32]
C000142781 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[32]
C000142781 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[33]
C000142781 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[33]
C000142781 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[33]
C000142781 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[33]
C000142781 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[33]
C000142781 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[33]
C000142781 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[33]
C000142781 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[33]
C000142781 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[31],[34]
C000142781 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[31],[35]
C000142781 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[31]
C000142781 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[31]
C000142781 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[31]
C000142781 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[31]
C000142781 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[31]
C000142781 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142781 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000142782 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[36]
C000142782 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[37]
C000142782 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[37]
C000142782 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[37]
C000142782 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[38]
C000142782 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[38]
C000142782 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[38]
C000142782 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[38]
C000142782 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[38]
C000142782 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[38]
C000142782 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[38]
C000142782 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[38]
C000142782 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[36],[39]
C000142782 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[36],[40]
C000142782 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[36]
C000142782 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[36]
C000142782 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[36]
C000142782 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[36]
C000142782 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[36]
C000142782 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000142782 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000195688 [Member]
Holdings [Line Items]
Percent of Net Asset Value	100%	[41]
C000195688 [Member] | MFS Growth Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[42]
C000195688 [Member] | MFS International Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[42]
C000195688 [Member] | MFS Value Fund Strategic Allocation [Member]
Holdings [Line Items]
Percent of Net Asset Value	30.30%	[42]
C000195688 [Member] | Mini Russell 1000 Value Index Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.00%)	[43]
C000195688 [Member] | Mini MSCI EAFE Index Future MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(14.10%)	[43]
C000195688 [Member] | Mini Russell 1000 Growth Future DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(23.10%)	[43]
C000195688 [Member] | Standard And Poor s 500 Index Option 4200 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[43]
C000195688 [Member] | Standard And Poor s 500 Index Option 4400 00 PUT DEC 20 24 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.00%)	[43]
C000195688 [Member] | Standard And Poor s 500 Index Option 4900 00 PUT JUN 20 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[43]
C000195688 [Member] | Standard And Poor s 500 Index Option 4600 00 PUT SEP 19 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.40%)	[43]
C000195688 [Member] | Standard And Poor s 500 Index Option 5450 00 PUT MAR 21 25 [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)	[43]
C000195688 [Member] | Cash and Cash Equivalents [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.50%	[41],[44]
C000195688 [Member] | Other Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	52.60%	[41],[45]
C000195688 [Member] | Standard And Poors Index Option PUT s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[41]
C000195688 [Member] | Downside Hedge s [Member]
Holdings [Line Items]
Percent of Net Asset Value	(1.30%)	[41]
C000195688 [Member] | Net Equivalent Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.40%	[41]
C000195688 [Member] | Limited Maturity U S Treasury Notes [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[41]
C000195688 [Member] | Net Equity Exposure [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.70%	[41]
C000195688 [Member] | Net Equivalent Equity Exposure Active Security Selection [Member]
Holdings [Line Items]
Percent of Net Asset Value	90.90%
C000195688 [Member] | Net Equivalent Equity Exposure Derivative Overlay Positions [Member]
Holdings [Line Items]
Percent of Net Asset Value	(52.50%)
C000160020 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160020 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160020 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160020 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160020 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160020 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160020 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160020 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160020 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160020 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160020 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160020 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160020 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160020 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160020 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160020 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160020 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160020 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160020 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160020 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160020 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160020 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160021 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160021 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160021 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160021 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160021 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160021 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160021 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160021 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160021 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160021 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160021 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160021 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160021 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160021 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160021 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160021 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160021 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160021 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160021 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160021 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160021 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160021 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160022 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160022 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160022 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160022 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160022 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160022 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160022 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160022 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160022 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160022 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160022 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160022 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160022 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160022 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160022 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160022 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160022 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160022 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160022 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160022 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160022 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160022 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160023 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160023 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160023 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160023 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160023 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160023 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160023 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160023 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160023 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160023 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160023 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160023 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160023 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160023 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160023 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160023 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160023 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160023 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160023 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160023 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160023 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160023 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160024 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160024 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160024 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160024 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160024 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160024 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160024 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160024 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160024 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160024 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160024 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160024 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160024 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160024 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160024 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160024 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160024 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160024 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160024 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160024 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160024 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160024 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160025 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160025 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160025 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160025 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160025 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160025 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160025 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160025 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160025 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160025 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160025 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160025 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160025 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160025 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160025 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160025 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160025 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160025 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160025 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160025 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160025 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160025 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160026 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160026 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160026 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160026 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160026 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160026 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160026 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160026 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160026 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160026 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160026 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160026 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160026 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160026 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160026 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160026 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160026 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160026 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160026 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160026 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160026 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160026 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160027 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160027 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160027 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160027 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160027 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160027 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160027 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160027 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160027 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160027 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160027 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160027 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160027 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160027 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160027 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160027 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160027 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160027 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160027 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160027 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160027 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160027 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160028 [Member] | NVIDIA Corp [Member]
Holdings [Line Items]
Percent of Total Investments	12%
C000160028 [Member] | Apple Inc [Member]
Holdings [Line Items]
Percent of Total Investments	10.90%
C000160028 [Member] | Microsoft Corp [Member]
Holdings [Line Items]
Percent of Total Investments	9.70%
C000160028 [Member] | Amazon com Inc [Member]
Holdings [Line Items]
Percent of Total Investments	6.90%
C000160028 [Member] | Meta Platforms Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000160028 [Member] | Alphabet Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	4.30%
C000160028 [Member] | Alphabet Inc C [Member]
Holdings [Line Items]
Percent of Total Investments	2.80%
C000160028 [Member] | ServiceNow Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160028 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000160028 [Member] | Booking Holdings Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160028 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	48.80%
C000160028 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.90%
C000160028 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	13.30%
C000160028 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000160028 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.50%
C000160028 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000160028 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160028 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160028 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.20%
C000160028 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	0.40%
C000160028 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.80%
C000160028 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.20%
C000160029 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160029 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160029 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160029 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160029 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160029 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160029 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160029 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160029 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160029 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160029 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160029 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160029 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160029 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160029 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160029 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160029 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160029 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160029 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160029 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160029 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160029 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160029 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160030 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160030 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160030 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160030 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160030 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160030 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160030 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160030 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160030 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160030 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160030 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160030 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160030 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160030 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160030 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160030 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160030 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160030 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160030 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160030 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160030 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160030 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160030 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160031 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160031 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160031 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160031 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160031 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160031 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160031 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160031 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160031 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160031 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160031 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160031 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160031 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160031 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160031 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160031 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160031 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160031 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160031 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160031 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160031 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160031 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160031 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160032 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160032 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160032 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160032 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160032 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160032 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160032 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160032 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160032 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160032 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160032 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160032 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160032 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160032 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160032 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160032 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160032 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160032 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160032 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160032 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160032 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160032 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160032 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160033 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160033 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160033 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160033 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160033 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160033 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160033 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160033 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160033 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160033 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160033 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160033 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160033 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160033 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160033 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160033 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160033 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160033 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160033 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160033 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160033 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160033 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160033 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160034 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160034 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160034 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160034 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160034 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160034 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160034 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160034 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160034 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160034 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160034 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160034 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160034 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160034 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160034 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160034 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160034 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160034 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160034 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160034 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160034 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160034 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160034 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160035 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160035 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160035 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160035 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160035 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160035 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160035 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160035 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160035 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160035 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160035 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160035 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160035 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160035 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160035 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160035 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160035 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160035 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160035 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160035 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160035 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160035 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160035 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160036 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160036 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160036 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160036 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160036 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160036 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160036 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160036 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160036 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160036 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160036 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160036 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160036 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160036 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160036 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160036 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160036 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160036 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160036 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160036 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160036 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160036 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160036 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160037 [Member] | Prestige Consumer Healthcare Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160037 [Member] | Newell Brands Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160037 [Member] | Encompass Health Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160037 [Member] | SLM Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160037 [Member] | Columbia Banking System Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160037 [Member] | Piedmont Office Realty Trust Inc REIT [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160037 [Member] | Armstrong World Industries Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000160037 [Member] | Element Solutions Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160037 [Member] | Grand Canyon Education Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160037 [Member] | Cathay General Bancorp Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160037 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.80%
C000160037 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	11.10%
C000160037 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	2.90%
C000160037 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.60%
C000160037 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	20.40%
C000160037 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.90%
C000160037 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.40%
C000160037 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160037 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000160037 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5%
C000160037 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.40%
C000160037 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.70%
C000160037 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.30%
C000160038 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160038 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160038 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160038 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160038 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160038 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160038 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160038 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160038 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160038 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160038 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160038 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160038 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160038 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160038 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160038 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160038 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160038 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160038 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160038 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160038 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160038 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160038 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160039 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160039 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160039 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160039 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160039 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160039 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160039 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160039 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160039 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160039 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160039 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160039 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160039 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160039 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160039 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160039 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160039 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160039 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160039 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160039 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160039 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160039 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160039 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160040 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160040 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160040 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160040 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160040 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160040 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160040 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160040 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160040 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160040 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160040 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160040 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160040 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160040 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160040 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160040 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160040 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160040 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160040 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160040 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160040 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160040 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160040 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160041 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160041 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160041 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160041 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160041 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160041 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160041 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160041 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160041 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160041 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160041 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160041 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160041 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160041 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160041 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160041 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160041 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160041 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160041 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160041 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160041 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160041 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160041 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160042 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160042 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160042 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160042 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160042 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160042 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160042 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160042 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160042 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160042 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160042 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160042 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160042 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160042 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160042 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160042 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160042 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160042 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160042 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160042 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160042 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160042 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160042 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160043 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160043 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160043 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160043 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160043 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160043 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160043 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160043 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160043 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160043 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160043 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160043 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160043 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160043 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160043 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160043 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160043 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160043 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160043 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160043 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160043 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160043 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160043 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160044 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160044 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160044 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160044 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160044 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160044 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160044 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160044 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160044 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160044 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160044 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160044 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160044 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160044 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160044 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160044 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160044 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160044 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160044 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160044 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160044 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160044 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160044 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160045 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160045 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160045 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160045 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160045 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160045 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160045 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160045 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160045 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160045 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160045 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160045 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160045 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160045 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160045 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160045 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160045 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160045 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160045 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160045 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160045 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160045 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160045 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000160046 [Member] | JPMorgan Chase And Co [Member]
Holdings [Line Items]
Percent of Total Investments	3.20%
C000160046 [Member] | Johnson And Johnson [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000160046 [Member] | Wells Fargo And Co [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000160046 [Member] | NextEra Energy Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160046 [Member] | Berkshire Hathaway Inc B [Member]
Holdings [Line Items]
Percent of Total Investments	1.90%
C000160046 [Member] | Eaton Corp PLC [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160046 [Member] | American Express Co [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160046 [Member] | T Mobile USA Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000160046 [Member] | Fiserv Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160046 [Member] | Pfizer Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000160046 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.30%
C000160046 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	6.20%
C000160046 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000160046 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	15.20%
C000160046 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	22.40%
C000160046 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	14%
C000160046 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	8.10%
C000160046 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.90%
C000160046 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	5.20%
C000160046 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000160046 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.20%
C000160046 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.50%
C000160046 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.50%
C000172715 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172715 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172715 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172715 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172715 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172715 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172715 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172715 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172715 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172715 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172715 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172715 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172715 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172715 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172715 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172715 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172715 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172715 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172715 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172715 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172715 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172715 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172715 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172716 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172716 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172716 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172716 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172716 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172716 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172716 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172716 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172716 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172716 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172716 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172716 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172716 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172716 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172716 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172716 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172716 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172716 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172716 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172716 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172716 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172716 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172716 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172717 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172717 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172717 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172717 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172717 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172717 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172717 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172717 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172717 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172717 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172717 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172717 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172717 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172717 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172717 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172717 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172717 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172717 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172717 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172717 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172717 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172717 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172717 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172718 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172718 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172718 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172718 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172718 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172718 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172718 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172718 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172718 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172718 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172718 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172718 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172718 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172718 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172718 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172718 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172718 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172718 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172718 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172718 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172718 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172718 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172718 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172719 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172719 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172719 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172719 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172719 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172719 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172719 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172719 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172719 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172719 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172719 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172719 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172719 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172719 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172719 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172719 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172719 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172719 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172719 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172719 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172719 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172719 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172719 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172720 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172720 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172720 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172720 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172720 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172720 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172720 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172720 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172720 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172720 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172720 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172720 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172720 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172720 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172720 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172720 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172720 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172720 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172720 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172720 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172720 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172720 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172720 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172721 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172721 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172721 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172721 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172721 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172721 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172721 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172721 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172721 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172721 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172721 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172721 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172721 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172721 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172721 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172721 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172721 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172721 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172721 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172721 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172721 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172721 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172721 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172722 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172722 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172722 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172722 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172722 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172722 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172722 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172722 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172722 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172722 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172722 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172722 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172722 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172722 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172722 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172722 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172722 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172722 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172722 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172722 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172722 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172722 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172722 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000172723 [Member] | AppLovin Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172723 [Member] | Ameriprise Financial Inc [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000172723 [Member] | M And T Bank Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.80%
C000172723 [Member] | Spotify Technology S A [Member]
Holdings [Line Items]
Percent of Total Investments	1.70%
C000172723 [Member] | Vistra Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172723 [Member] | Wabtec Corp [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172723 [Member] | Hartford Financial Services Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172723 [Member] | Veeva Systems Inc [Member]
Holdings [Line Items]
Percent of Total Investments	1.60%
C000172723 [Member] | Datadog Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172723 [Member] | Verisk Analytics Inc A [Member]
Holdings [Line Items]
Percent of Total Investments	1.50%
C000172723 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Total Investments	12.70%
C000172723 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.50%
C000172723 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.90%
C000172723 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Total Investments	10.40%
C000172723 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Total Investments	17.40%
C000172723 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Total Investments	16.70%
C000172723 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Total Investments	3.50%
C000172723 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.80%
C000172723 [Member] | Utilities Sector [Member]
Holdings [Line Items]
Percent of Total Investments	7.30%
C000172723 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.40%
C000172723 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Total Investments	4.50%
C000172723 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	0.90%
C000172723 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	99.10%
C000220109 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220109 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220109 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220109 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220109 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220109 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220109 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220109 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220109 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220109 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220109 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220109 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220109 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220109 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220109 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220109 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220109 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220109 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220109 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220109 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220109 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220109 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
C000220112 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220112 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220112 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220112 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220112 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220112 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220112 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220112 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220112 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220112 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220112 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220112 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220112 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220112 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220112 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220112 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220112 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220112 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220112 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220112 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220112 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220112 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
C000220111 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220111 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220111 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220111 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220111 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220111 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220111 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220111 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220111 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220111 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220111 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220111 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220111 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220111 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220111 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220111 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220111 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220111 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220111 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220111 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220111 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220111 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
C000220110 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220110 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220110 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220110 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220110 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220110 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220110 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220110 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220110 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220110 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220110 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220110 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220110 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220110 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220110 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220110 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220110 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220110 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220110 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220110 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220110 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220110 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
C000220113 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220113 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220113 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220113 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220113 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220113 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220113 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220113 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220113 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220113 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220113 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220113 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220113 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220113 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220113 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220113 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220113 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220113 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220113 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220113 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220113 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220113 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
C000220108 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220108 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220108 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220108 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220108 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220108 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220108 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220108 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220108 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220108 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220108 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220108 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220108 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220108 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220108 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220108 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220108 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220108 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220108 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220108 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220108 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220108 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
C000220107 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220107 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220107 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220107 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220107 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220107 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220107 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220107 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220107 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220107 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220107 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220107 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220107 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220107 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220107 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220107 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220107 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220107 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220107 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220107 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220107 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220107 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
C000220106 [Member] | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220106 [Member] | Roche Holding AG [Member]
Holdings [Line Items]
Percent of Total Investments	2.70%
C000220106 [Member] | NatWest Group PLC [Member]
Holdings [Line Items]
Percent of Total Investments	4.10%
C000220106 [Member] | TotalEnergies SE [Member]
Holdings [Line Items]
Percent of Total Investments	2%
C000220106 [Member] | Mitsubishi UFJ Financial Group Inc [Member]
Holdings [Line Items]
Percent of Total Investments	3.70%
C000220106 [Member] | UBS Group AG [Member]
Holdings [Line Items]
Percent of Total Investments	3%
C000220106 [Member] | Willis Towers Watson PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.60%
C000220106 [Member] | BNP Paribas S A [Member]
Holdings [Line Items]
Percent of Total Investments	2.20%
C000220106 [Member] | Sanofi [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220106 [Member] | National Grid PLC [Member]
Holdings [Line Items]
Percent of Total Investments	2.10%
C000220106 [Member] | Other Countries [Member]
Holdings [Line Items]
Percent of Total Investments	8.80%
C000220106 [Member] | FRANCE
Holdings [Line Items]
Percent of Total Investments	14.70%
C000220106 [Member] | GERMANY
Holdings [Line Items]
Percent of Total Investments	6.30%
C000220106 [Member] | JAPAN
Holdings [Line Items]
Percent of Total Investments	16.70%
C000220106 [Member] | SWITZERLAND
Holdings [Line Items]
Percent of Total Investments	8.70%
C000220106 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Total Investments	27.20%
C000220106 [Member] | CANADA
Holdings [Line Items]
Percent of Total Investments	5.50%
C000220106 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Total Investments	5.70%
C000220106 [Member] | IRELAND
Holdings [Line Items]
Percent of Total Investments	3.50%
C000220106 [Member] | SPAIN
Holdings [Line Items]
Percent of Total Investments	2.90%
C000220106 [Member] | Money Market Funds [Member]
Holdings [Line Items]
Percent of Total Investments	2.40%
C000220106 [Member] | Equity [Member]
Holdings [Line Items]
Percent of Total Investments	97.60%
[1]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[2]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[3]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[4]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[5]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[6]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[7]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[8]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[9]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[10]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[11]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[12]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[13]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[14]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[15]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[16]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[17]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[18]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[19]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[20]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[21]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[22]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[23]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[24]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[25]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[26]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[27]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[28]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[29]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[30]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[31]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[32]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[33]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[34]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[35]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[36]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[37]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[38]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[39]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[40]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.[41]For purposes of this presentation, the components include the value of securities, less any securities sold short, and reflect the impact of the equivalent exposure of all derivative positions. These amounts may be negative from time to time. The bond component will include any accrued interest amounts.[42]Represents the actively managed portion of the portfolio and for purposes of this presentation, components include the value of securities, less any securities sold short. The bond component will include any accrued interest amounts. This also reflects the equivalent exposure of certain derivative positions. These amounts may be negative from time to time.[43]Represents the tactical overlay portion of the portfolio which is how the fund manages its exposure to markets and currencies through the use of derivative positions. Percentages reflect the equivalent exposure of those derivative positions.[44]Cash & Cash Equivalents includes any cash, investments in money market funds, short-term securities, and other assets less liabilities.[45]Other includes currency derivatives and/or the offsetting of the leverage produced by derivative positions.