Fidelity Advisor Dividend Growth Z (FZADX) N-CSR 20 Dec 24 Certified annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
	Oct. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Fidelity Advisor Series I
Entity Central Index Key	0000722574
Entity Investment Company Type	N-1A
Document Period End Date	Oct. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
	Oct. 31, 2024 USD ($) shares
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Fidelity Advisor Series I
Entity Central Index Key	0000722574
Entity Investment Company Type	N-1A
Document Period End Date	Oct. 31, 2024
Fidelity Advisor Value Fund - Class Z
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Value Fund
Class Name	Fidelity Advisor® Value Fund Class Z
Trading Symbol	FVLZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Value Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.75 %
Expenses Paid, Amount	$ 87
Expense Ratio, Percent	0.75%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B26">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE February 1, 2017 through October 31, 2024. Initial investment of $10,000. Class Z $10,000 $10,891 $10,416 $11,400 $10,734 $17,805 $16,584 $16,773 Russell Midcap® Value Index $10,000 $10,684 $10,701 $11,780 $10,963 $16,290 $14,633 $14,111 Russell 3000® Index $10,000 $11,422 $12,175 $13,818 $15,220 $21,902 $18,284 $19,816   2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Class Z 31.21% 14.06% 10.71% Russell Midcap® Value Index 34.03% 9.93% 8.57% Russell 3000® Index 37.86% 14.60% 13.84% A   From February 1, 2017 Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Performance Inception Date	Feb. 01, 2017
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 380,025,415
Holdings Count | shares	268
Advisory Fees Paid, Amount	$ 2,906,123
Investment Company Portfolio Turnover	80%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 268 Total Advisory Fee $ Portfolio Turnover 80 %
Holdings [Text Block]	MARKET SECTORS (% of Fund's net assets)     Industrials 19.2   Financials 16.7   Consumer Discretionary 10.3   Materials 10.3   Energy 9.2   Health Care 8.8   Utilities 6.9   Real Estate 5.3   Consumer Staples 5.2   Information Technology 4.3   Communication Services 2.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 86.3 Canada 6.0 United Kingdom 1.2 Germany 1.1 Puerto Rico 0.6 Belgium 0.6 Zambia 0.6 India 0.5 France 0.5 Others 2.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     PG&E Corp 1.2   Vistra Corp 1.2   Ventas Inc 1.0   Global Payments Inc 1.0   Molina Healthcare Inc 0.9   Smurfit WestRock PLC 0.9   Lithia Motors Inc Class A 0.9   Lumentum Holdings Inc 0.8   International Paper Co 0.8   Lamb Weston Holdings Inc 0.8     9.5
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B41">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B42">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B43">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor High Income Advantage Fund - Class C
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® High Income Advantage Fund
Class Name	Fidelity Advisor® High Income Advantage Fund Class C
Trading Symbol	FAHEX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® High Income Advantage Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.72 %
Expenses Paid, Amount	$ 187
Expense Ratio, Percent	1.72%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B60">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000. Class C $10,000 $9,930 $10,477 $11,725 $11,694 $12,466 $12,669 $15,323 $13,568 $14,269 $16,806 ICE® BofA® US High Yield Constrained Index $10,000 $9,797 $10,795 $11,781 $11,883 $12,872 $13,187 $14,602 $12,932 $13,683 $15,939 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class C  (incl. contingent deferred sales charge) 16.04% 5.84% 5.33% Class C 17.04% 5.84% 5.33% ICE® BofA® US High Yield Constrained Index 16.49% 4.37% 4.77% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 2,310,946,691
Holdings Count | shares	717
Advisory Fees Paid, Amount	$ 13,652,978
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 717 Total Advisory Fee $ Portfolio Turnover 29 %
Holdings [Text Block]	BBB 4.8 BB 20.7 B 30.9 CCC,CC,C 6.6 Not Rated 2.9 Equities 22.3 Short-Term Investments and Net Other Assets (Liabilities) 11.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Corporate Bonds 51.5 Common Stocks 20.1 Bank Loan Obligations 10.1 Preferred Securities 4.1 Alternative Funds 2.2 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 11.8 ASSET ALLOCATION (% of Fund's net assets)   United States 91.1 Canada 1.9 United Kingdom 1.8 France 1.4 Netherlands 0.5 China 0.5 Luxembourg 0.4 Zambia 0.4 Taiwan 0.3 Others 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     TransDigm Inc 2.6   Fidelity Private Credit Company LLC 2.2   Energy Transfer LP 2.1   NVIDIA Corp 1.4   Tenet Healthcare Corp 1.4   LBM Acquisition LLC 1.2   Altice France SA 1.1   eG Global Finance PLC 1.1   Carnival Corp 1.1   Meta Platforms Inc Class A 1.1     15.3
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B74">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B75">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B76">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor High Income Advantage Fund - Class A
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® High Income Advantage Fund
Class Name	Fidelity Advisor® High Income Advantage Fund Class A
Trading Symbol	FAHDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® High Income Advantage Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.97 %
Expenses Paid, Amount	$ 105
Expense Ratio, Percent	0.97%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B93">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class A $9,600 $9,606 $10,211 $11,513 $11,571 $12,428 $12,728 $15,509 $13,841 $14,555 $17,144 ICE® BofA® US High Yield Constrained Index $10,000 $9,797 $10,795 $11,781 $11,883 $12,872 $13,187 $14,602 $12,932 $13,683 $15,939 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class A (incl. 4.00% sales charge)   13.07% 5.78% 5.54% Class A (without 4.00% sales charge) 17.78% 6.64% 5.97% ICE® BofA® US High Yield Constrained Index 16.49% 4.37% 4.77% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 2,310,946,691
Holdings Count | shares	717
Advisory Fees Paid, Amount	$ 13,652,978
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 717 Total Advisory Fee $ Portfolio Turnover 29 %
Holdings [Text Block]	BBB 4.8 BB 20.7 B 30.9 CCC,CC,C 6.6 Not Rated 2.9 Equities 22.3 Short-Term Investments and Net Other Assets (Liabilities) 11.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Corporate Bonds 51.5 Common Stocks 20.1 Bank Loan Obligations 10.1 Preferred Securities 4.1 Alternative Funds 2.2 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 11.8 ASSET ALLOCATION (% of Fund's net assets)   United States 91.1 Canada 1.9 United Kingdom 1.8 France 1.4 Netherlands 0.5 China 0.5 Luxembourg 0.4 Zambia 0.4 Taiwan 0.3 Others 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     TransDigm Inc 2.6   Fidelity Private Credit Company LLC 2.2   Energy Transfer LP 2.1   NVIDIA Corp 1.4   Tenet Healthcare Corp 1.4   LBM Acquisition LLC 1.2   Altice France SA 1.1   eG Global Finance PLC 1.1   Carnival Corp 1.1   Meta Platforms Inc Class A 1.1     15.3
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B107">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B108">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B109">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Floating Rate High Income Fund
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Floating Rate High Income Fund
Class Name	Fidelity® Floating Rate High Income Fund
Trading Symbol	FFRHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Floating Rate High Income Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-800-544-8544
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Floating Rate High Income Fund $ 0.66 %
Expenses Paid, Amount	$ 70
Expense Ratio, Percent	0.66%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B126">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000. Fidelity® Floating Rate High Income Fund $10,000 $9,964 $10,590 $11,088 $11,533 $11,870 $11,853 $12,988 $12,756 $14,158 $15,597 Morningstar® LSTA® US Performing Loans $10,000 $10,151 $10,824 $11,392 $11,936 $12,235 $12,491 $13,602 $13,349 $14,977 $16,603 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® Floating Rate High Income Fund 10.16% 5.61% 4.54% Morningstar® LSTA® US Performing Loans 10.86% 6.29% 5.20% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit www.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 14,682,141,753
Holdings Count | shares	623
Advisory Fees Paid, Amount	$ 84,188,738
Investment Company Portfolio Turnover	41%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 623 Total Advisory Fee $ Portfolio Turnover 41 %
Holdings [Text Block]	BBB 1.3 BB 22.5 B 59.8 CCC,CC,C 6.1 Not Rated 5.4 Equities 2.3 Short-Term Investments and Net Other Assets (Liabilities) 2.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Bank Loan Obligations 90.1 Corporate Bonds 4.5 Common Stocks 1.5 Alternative Funds 0.8 Preferred Securities 0.3 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 2.6 ASSET ALLOCATION (% of Fund's net assets)   United States 90.3 United Kingdom 2.5 Canada 2.0 Netherlands 1.1 France 0.8 Puerto Rico 0.7 Luxembourg 0.6 Ireland 0.4 Grand Cayman (UK Overseas Ter) 0.4 Others 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     Asurion LLC 2.2   Great Outdoors Group LLC 2.2   Fertitta Entertainment LLC/NV 1.2   Acrisure LLC 1.2   Caesars Entertainment Inc 1.2   Polaris Newco LLC 1.0   MH Sub I LLC 1.0   TransDigm Inc 1.0   Medline Borrower LP 0.9   UKG Inc 0.9     12.8
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-800-544-8544</span>" id="sjs-B140">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B141">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B142">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Floating Rate High Income Fund - Class I
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Floating Rate High Income Fund
Class Name	Fidelity Advisor® Floating Rate High Income Fund Class I
Trading Symbol	FFRIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Floating Rate High Income Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.68 %
Expenses Paid, Amount	$ 72
Expense Ratio, Percent	0.68%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B159">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000. Class I $10,000 $9,970 $10,591 $11,083 $11,508 $11,839 $11,816 $12,942 $12,718 $14,097 $15,525 Morningstar® LSTA® US Performing Loans $10,000 $10,151 $10,824 $11,392 $11,936 $12,235 $12,491 $13,602 $13,349 $14,977 $16,603 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class I 10.13% 5.57% 4.50% Morningstar® LSTA® US Performing Loans 10.86% 6.29% 5.20% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 14,682,141,753
Holdings Count | shares	623
Advisory Fees Paid, Amount	$ 84,188,738
Investment Company Portfolio Turnover	41%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 623 Total Advisory Fee $ Portfolio Turnover 41 %
Holdings [Text Block]	BBB 1.3 BB 22.5 B 59.8 CCC,CC,C 6.1 Not Rated 5.4 Equities 2.3 Short-Term Investments and Net Other Assets (Liabilities) 2.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Bank Loan Obligations 90.1 Corporate Bonds 4.5 Common Stocks 1.5 Alternative Funds 0.8 Preferred Securities 0.3 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 2.6 ASSET ALLOCATION (% of Fund's net assets)   United States 90.3 United Kingdom 2.5 Canada 2.0 Netherlands 1.1 France 0.8 Puerto Rico 0.7 Luxembourg 0.6 Ireland 0.4 Grand Cayman (UK Overseas Ter) 0.4 Others 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     Asurion LLC 2.2   Great Outdoors Group LLC 2.2   Fertitta Entertainment LLC/NV 1.2   Acrisure LLC 1.2   Caesars Entertainment Inc 1.2   Polaris Newco LLC 1.0   MH Sub I LLC 1.0   TransDigm Inc 1.0   Medline Borrower LP 0.9   UKG Inc 0.9     12.8
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B173">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B174">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B175">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Value Fund - Class I
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Value Fund
Class Name	Fidelity Advisor® Value Fund Class I
Trading Symbol	FVIFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Value Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.90 %
Expenses Paid, Amount	$ 104
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B192">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000. Class I $10,000 $10,013 $10,295 $12,307 $11,755 $12,852 $12,087 $20,026 $18,626 $18,806 $24,643 Russell Midcap® Value Index $10,000 $10,047 $10,834 $12,689 $12,710 $13,990 $13,020 $19,347 $17,379 $16,759 $22,463 Russell 3000® Index $10,000 $10,449 $10,892 $13,504 $14,395 $16,337 $17,995 $25,894 $21,617 $23,429 $32,298   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class I 31.04% 13.90% 9.44% Russell Midcap® Value Index 34.03% 9.93% 8.43% Russell 3000® Index 37.86% 14.60% 12.44%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 380,025,415
Holdings Count | shares	268
Advisory Fees Paid, Amount	$ 2,906,123
Investment Company Portfolio Turnover	80%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 268 Total Advisory Fee $ Portfolio Turnover 80 %
Holdings [Text Block]	MARKET SECTORS (% of Fund's net assets)     Industrials 19.2   Financials 16.7   Consumer Discretionary 10.3   Materials 10.3   Energy 9.2   Health Care 8.8   Utilities 6.9   Real Estate 5.3   Consumer Staples 5.2   Information Technology 4.3   Communication Services 2.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 86.3 Canada 6.0 United Kingdom 1.2 Germany 1.1 Puerto Rico 0.6 Belgium 0.6 Zambia 0.6 India 0.5 France 0.5 Others 2.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     PG&E Corp 1.2   Vistra Corp 1.2   Ventas Inc 1.0   Global Payments Inc 1.0   Molina Healthcare Inc 0.9   Smurfit WestRock PLC 0.9   Lithia Motors Inc Class A 0.9   Lumentum Holdings Inc 0.8   International Paper Co 0.8   Lamb Weston Holdings Inc 0.8     9.5
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B206">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B207">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B208">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor High Income Advantage Fund - Class M
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® High Income Advantage Fund
Class Name	Fidelity Advisor® High Income Advantage Fund Class M
Trading Symbol	FAHYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® High Income Advantage Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 0.96 %
Expenses Paid, Amount	$ 104
Expense Ratio, Percent	0.96%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B225">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class M $9,600 $9,617 $10,223 $11,523 $11,584 $12,440 $12,742 $15,525 $13,856 $14,572 $17,168 ICE® BofA® US High Yield Constrained Index $10,000 $9,797 $10,795 $11,781 $11,883 $12,872 $13,187 $14,602 $12,932 $13,683 $15,939 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class M (incl. 4.00% sales charge)   13.10% 5.79% 5.55% Class M (without 4.00% sales charge) 17.82% 6.65% 5.98% ICE® BofA® US High Yield Constrained Index 16.49% 4.37% 4.77% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 2,310,946,691
Holdings Count | shares	717
Advisory Fees Paid, Amount	$ 13,652,978
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 717 Total Advisory Fee $ Portfolio Turnover 29 %
Holdings [Text Block]	BBB 4.8 BB 20.7 B 30.9 CCC,CC,C 6.6 Not Rated 2.9 Equities 22.3 Short-Term Investments and Net Other Assets (Liabilities) 11.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Corporate Bonds 51.5 Common Stocks 20.1 Bank Loan Obligations 10.1 Preferred Securities 4.1 Alternative Funds 2.2 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 11.8 ASSET ALLOCATION (% of Fund's net assets)   United States 91.1 Canada 1.9 United Kingdom 1.8 France 1.4 Netherlands 0.5 China 0.5 Luxembourg 0.4 Zambia 0.4 Taiwan 0.3 Others 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     TransDigm Inc 2.6   Fidelity Private Credit Company LLC 2.2   Energy Transfer LP 2.1   NVIDIA Corp 1.4   Tenet Healthcare Corp 1.4   LBM Acquisition LLC 1.2   Altice France SA 1.1   eG Global Finance PLC 1.1   Carnival Corp 1.1   Meta Platforms Inc Class A 1.1     15.3
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B239">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B240">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B241">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Floating Rate High Income Fund - Class Z
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Floating Rate High Income Fund
Class Name	Fidelity Advisor® Floating Rate High Income Fund Class Z
Trading Symbol	FIQSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Floating Rate High Income Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.58 %
Expenses Paid, Amount	$ 61
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B258">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE October 2, 2018 through October 31, 2024. Initial investment of $10,000. Class Z $10,000 $9,974 $10,271 $10,272 $11,249 $11,066 $12,289 Morningstar® LSTA® US Performing Loans $10,000 $9,991 $10,242 $10,456 $11,386 $11,174 $12,536 Bloomberg U.S. Universal Bond Index $10,000 $9,913 $11,039 $11,697 $11,754 $9,898 $10,016   2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Class Z 10.24% 5.69% 5.12% Morningstar® LSTA® US Performing Loans 10.86% 6.29% 5.56% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.79% A   From October 2, 2018 Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Performance Inception Date	Oct. 02, 2018
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 14,682,141,753
Holdings Count | shares	623
Advisory Fees Paid, Amount	$ 84,188,738
Investment Company Portfolio Turnover	41%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 623 Total Advisory Fee $ Portfolio Turnover 41 %
Holdings [Text Block]	BBB 1.3 BB 22.5 B 59.8 CCC,CC,C 6.1 Not Rated 5.4 Equities 2.3 Short-Term Investments and Net Other Assets (Liabilities) 2.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Bank Loan Obligations 90.1 Corporate Bonds 4.5 Common Stocks 1.5 Alternative Funds 0.8 Preferred Securities 0.3 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 2.6 ASSET ALLOCATION (% of Fund's net assets)   United States 90.3 United Kingdom 2.5 Canada 2.0 Netherlands 1.1 France 0.8 Puerto Rico 0.7 Luxembourg 0.6 Ireland 0.4 Grand Cayman (UK Overseas Ter) 0.4 Others 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     Asurion LLC 2.2   Great Outdoors Group LLC 2.2   Fertitta Entertainment LLC/NV 1.2   Acrisure LLC 1.2   Caesars Entertainment Inc 1.2   Polaris Newco LLC 1.0   MH Sub I LLC 1.0   TransDigm Inc 1.0   Medline Borrower LP 0.9   UKG Inc 0.9     12.8
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B273">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B274">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B275">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Value Fund - Class A
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Value Fund
Class Name	Fidelity Advisor® Value Fund Class A
Trading Symbol	FAVFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Value Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 1.15 %
Expenses Paid, Amount	$ 133
Expense Ratio, Percent	1.15%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B292">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,414 $9,652 $11,497 $10,953 $11,939 $11,194 $18,493 $17,152 $17,277 $22,584 Russell Midcap® Value Index $10,000 $10,047 $10,834 $12,689 $12,710 $13,990 $13,020 $19,347 $17,379 $16,759 $22,463 Russell 3000® Index $10,000 $10,449 $10,892 $13,504 $14,395 $16,337 $17,995 $25,894 $21,617 $23,429 $32,298   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class A (incl. 5.75% sales charge)   23.20% 12.26% 8.49% Class A (without 5.75% sales charge) 30.72% 13.60% 9.13% Russell Midcap® Value Index 34.03% 9.93% 8.43% Russell 3000® Index 37.86% 14.60% 12.44%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 380,025,415
Holdings Count | shares	268
Advisory Fees Paid, Amount	$ 2,906,123
Investment Company Portfolio Turnover	80%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 268 Total Advisory Fee $ Portfolio Turnover 80 %
Holdings [Text Block]	MARKET SECTORS (% of Fund's net assets)     Industrials 19.2   Financials 16.7   Consumer Discretionary 10.3   Materials 10.3   Energy 9.2   Health Care 8.8   Utilities 6.9   Real Estate 5.3   Consumer Staples 5.2   Information Technology 4.3   Communication Services 2.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 86.3 Canada 6.0 United Kingdom 1.2 Germany 1.1 Puerto Rico 0.6 Belgium 0.6 Zambia 0.6 India 0.5 France 0.5 Others 2.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     PG&E Corp 1.2   Vistra Corp 1.2   Ventas Inc 1.0   Global Payments Inc 1.0   Molina Healthcare Inc 0.9   Smurfit WestRock PLC 0.9   Lithia Motors Inc Class A 0.9   Lumentum Holdings Inc 0.8   International Paper Co 0.8   Lamb Weston Holdings Inc 0.8     9.5
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B306">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B307">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B308">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Value Fund - Class C
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Value Fund
Class Name	Fidelity Advisor® Value Fund Class C
Trading Symbol	FCVFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Value Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.90 %
Expenses Paid, Amount	$ 218
Expense Ratio, Percent	1.90%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B325">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000. Class C $10,000 $9,911 $10,082 $11,917 $11,256 $12,171 $11,317 $18,557 $17,084 $17,208 $22,494 Russell Midcap® Value Index $10,000 $10,047 $10,834 $12,689 $12,710 $13,990 $13,020 $19,347 $17,379 $16,759 $22,463 Russell 3000® Index $10,000 $10,449 $10,892 $13,504 $14,395 $16,337 $17,995 $25,894 $21,617 $23,429 $32,298   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class C  (incl. contingent deferred sales charge) 28.70% 12.73% 8.44% Class C 29.70% 12.73% 8.44% Russell Midcap® Value Index 34.03% 9.93% 8.43% Russell 3000® Index 37.86% 14.60% 12.44%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 380,025,415
Holdings Count | shares	268
Advisory Fees Paid, Amount	$ 2,906,123
Investment Company Portfolio Turnover	80%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 268 Total Advisory Fee $ Portfolio Turnover 80 %
Holdings [Text Block]	MARKET SECTORS (% of Fund's net assets)     Industrials 19.2   Financials 16.7   Consumer Discretionary 10.3   Materials 10.3   Energy 9.2   Health Care 8.8   Utilities 6.9   Real Estate 5.3   Consumer Staples 5.2   Information Technology 4.3   Communication Services 2.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 86.3 Canada 6.0 United Kingdom 1.2 Germany 1.1 Puerto Rico 0.6 Belgium 0.6 Zambia 0.6 India 0.5 France 0.5 Others 2.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     PG&E Corp 1.2   Vistra Corp 1.2   Ventas Inc 1.0   Global Payments Inc 1.0   Molina Healthcare Inc 0.9   Smurfit WestRock PLC 0.9   Lithia Motors Inc Class A 0.9   Lumentum Holdings Inc 0.8   International Paper Co 0.8   Lamb Weston Holdings Inc 0.8     9.5
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B339">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B340">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B341">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Floating Rate High Income Fund - Class A
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Floating Rate High Income Fund
Class Name	Fidelity Advisor® Floating Rate High Income Fund Class A
Trading Symbol	FFRAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Floating Rate High Income Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.94 %
Expenses Paid, Amount	$ 99
Expense Ratio, Percent	0.94%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B358">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class A $9,725 $9,674 $10,252 $10,703 $11,089 $11,380 $11,329 $12,376 $12,133 $13,413 $14,733 Morningstar® LSTA® US Performing Loans $10,000 $10,151 $10,824 $11,392 $11,936 $12,235 $12,491 $13,602 $13,349 $14,977 $16,603 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class A (incl. 2.75% sales charge)   6.82% 4.72% 3.95% Class A (without 2.75% sales charge) 9.85% 5.30% 4.24% Morningstar® LSTA® US Performing Loans 10.86% 6.29% 5.20% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 14,682,141,753
Holdings Count | shares	623
Advisory Fees Paid, Amount	$ 84,188,738
Investment Company Portfolio Turnover	41%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 623 Total Advisory Fee $ Portfolio Turnover 41 %
Holdings [Text Block]	BBB 1.3 BB 22.5 B 59.8 CCC,CC,C 6.1 Not Rated 5.4 Equities 2.3 Short-Term Investments and Net Other Assets (Liabilities) 2.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Bank Loan Obligations 90.1 Corporate Bonds 4.5 Common Stocks 1.5 Alternative Funds 0.8 Preferred Securities 0.3 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 2.6 ASSET ALLOCATION (% of Fund's net assets)   United States 90.3 United Kingdom 2.5 Canada 2.0 Netherlands 1.1 France 0.8 Puerto Rico 0.7 Luxembourg 0.6 Ireland 0.4 Grand Cayman (UK Overseas Ter) 0.4 Others 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     Asurion LLC 2.2   Great Outdoors Group LLC 2.2   Fertitta Entertainment LLC/NV 1.2   Acrisure LLC 1.2   Caesars Entertainment Inc 1.2   Polaris Newco LLC 1.0   MH Sub I LLC 1.0   TransDigm Inc 1.0   Medline Borrower LP 0.9   UKG Inc 0.9     12.8
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B372">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B373">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B374">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor High Income Advantage Fund - Class I
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® High Income Advantage Fund
Class Name	Fidelity Advisor® High Income Advantage Fund Class I
Trading Symbol	FAHCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® High Income Advantage Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.73 %
Expenses Paid, Amount	$ 80
Expense Ratio, Percent	0.73%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B391">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000. Class I $10,000 $10,031 $10,686 $12,082 $12,178 $13,113 $13,466 $16,447 $14,710 $15,497 $18,315 ICE® BofA® US High Yield Constrained Index $10,000 $9,797 $10,795 $11,781 $11,883 $12,872 $13,187 $14,602 $12,932 $13,683 $15,939 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class I 18.18% 6.91% 6.24% ICE® BofA® US High Yield Constrained Index 16.49% 4.37% 4.77% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 2,310,946,691
Holdings Count | shares	717
Advisory Fees Paid, Amount	$ 13,652,978
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 717 Total Advisory Fee $ Portfolio Turnover 29 %
Holdings [Text Block]	BBB 4.8 BB 20.7 B 30.9 CCC,CC,C 6.6 Not Rated 2.9 Equities 22.3 Short-Term Investments and Net Other Assets (Liabilities) 11.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Corporate Bonds 51.5 Common Stocks 20.1 Bank Loan Obligations 10.1 Preferred Securities 4.1 Alternative Funds 2.2 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 11.8 ASSET ALLOCATION (% of Fund's net assets)   United States 91.1 Canada 1.9 United Kingdom 1.8 France 1.4 Netherlands 0.5 China 0.5 Luxembourg 0.4 Zambia 0.4 Taiwan 0.3 Others 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     TransDigm Inc 2.6   Fidelity Private Credit Company LLC 2.2   Energy Transfer LP 2.1   NVIDIA Corp 1.4   Tenet Healthcare Corp 1.4   LBM Acquisition LLC 1.2   Altice France SA 1.1   eG Global Finance PLC 1.1   Carnival Corp 1.1   Meta Platforms Inc Class A 1.1     15.3
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B405">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B406">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B407">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Floating Rate High Income Fund - Class M
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Floating Rate High Income Fund
Class Name	Fidelity Advisor® Floating Rate High Income Fund Class M
Trading Symbol	FFRTX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Floating Rate High Income Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 0.93 %
Expenses Paid, Amount	$ 97
Expense Ratio, Percent	0.93%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B424">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class M $9,725 $9,655 $10,223 $10,670 $11,053 $11,354 $11,301 $12,332 $12,089 $13,381 $14,700 Morningstar® LSTA® US Performing Loans $10,000 $10,151 $10,824 $11,392 $11,936 $12,235 $12,491 $13,602 $13,349 $14,977 $16,603 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class M (incl. 2.75% sales charge)   6.84% 4.72% 3.93% Class M (without 2.75% sales charge) 9.86% 5.30% 4.22% Morningstar® LSTA® US Performing Loans 10.86% 6.29% 5.20% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 14,682,141,753
Holdings Count | shares	623
Advisory Fees Paid, Amount	$ 84,188,738
Investment Company Portfolio Turnover	41%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 623 Total Advisory Fee $ Portfolio Turnover 41 %
Holdings [Text Block]	BBB 1.3 BB 22.5 B 59.8 CCC,CC,C 6.1 Not Rated 5.4 Equities 2.3 Short-Term Investments and Net Other Assets (Liabilities) 2.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Bank Loan Obligations 90.1 Corporate Bonds 4.5 Common Stocks 1.5 Alternative Funds 0.8 Preferred Securities 0.3 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 2.6 ASSET ALLOCATION (% of Fund's net assets)   United States 90.3 United Kingdom 2.5 Canada 2.0 Netherlands 1.1 France 0.8 Puerto Rico 0.7 Luxembourg 0.6 Ireland 0.4 Grand Cayman (UK Overseas Ter) 0.4 Others 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     Asurion LLC 2.2   Great Outdoors Group LLC 2.2   Fertitta Entertainment LLC/NV 1.2   Acrisure LLC 1.2   Caesars Entertainment Inc 1.2   Polaris Newco LLC 1.0   MH Sub I LLC 1.0   TransDigm Inc 1.0   Medline Borrower LP 0.9   UKG Inc 0.9     12.8
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B438">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B439">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B440">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Floating Rate High Income Fund - Class C
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Floating Rate High Income Fund
Class Name	Fidelity Advisor® Floating Rate High Income Fund Class C
Trading Symbol	FFRCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Floating Rate High Income Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.69 %
Expenses Paid, Amount	$ 177
Expense Ratio, Percent	1.69%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B457">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000. Class C $10,000 $9,862 $10,374 $10,761 $11,065 $11,271 $11,137 $12,075 $11,736 $12,974 $14,251 Morningstar® LSTA® US Performing Loans $10,000 $10,151 $10,824 $11,392 $11,936 $12,235 $12,491 $13,602 $13,349 $14,977 $16,603 Bloomberg U.S. Universal Bond Index $10,000 $10,167 $10,682 $10,870 $10,658 $11,869 $12,576 $12,636 $10,641 $10,768 $11,974   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class C  (incl. contingent deferred sales charge) 8.03% 4.51% 3.61% Class C 9.03% 4.51% 3.61% Morningstar® LSTA® US Performing Loans 10.86% 6.29% 5.20% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.82%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 14,682,141,753
Holdings Count | shares	623
Advisory Fees Paid, Amount	$ 84,188,738
Investment Company Portfolio Turnover	41%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 623 Total Advisory Fee $ Portfolio Turnover 41 %
Holdings [Text Block]	BBB 1.3 BB 22.5 B 59.8 CCC,CC,C 6.1 Not Rated 5.4 Equities 2.3 Short-Term Investments and Net Other Assets (Liabilities) 2.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Bank Loan Obligations 90.1 Corporate Bonds 4.5 Common Stocks 1.5 Alternative Funds 0.8 Preferred Securities 0.3 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 2.6 ASSET ALLOCATION (% of Fund's net assets)   United States 90.3 United Kingdom 2.5 Canada 2.0 Netherlands 1.1 France 0.8 Puerto Rico 0.7 Luxembourg 0.6 Ireland 0.4 Grand Cayman (UK Overseas Ter) 0.4 Others 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     Asurion LLC 2.2   Great Outdoors Group LLC 2.2   Fertitta Entertainment LLC/NV 1.2   Acrisure LLC 1.2   Caesars Entertainment Inc 1.2   Polaris Newco LLC 1.0   MH Sub I LLC 1.0   TransDigm Inc 1.0   Medline Borrower LP 0.9   UKG Inc 0.9     12.8
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B471">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B472">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B473">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor Value Fund - Class M
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® Value Fund
Class Name	Fidelity Advisor® Value Fund Class M
Trading Symbol	FTVFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® Value Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 1.40 %
Expenses Paid, Amount	$ 161
Expense Ratio, Percent	1.40%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B490">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE October 31, 2014 through October 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,608 $9,827 $11,673 $11,088 $12,058 $11,268 $18,571 $17,186 $17,271 $22,514 Russell Midcap® Value Index $10,000 $10,047 $10,834 $12,689 $12,710 $13,990 $13,020 $19,347 $17,379 $16,759 $22,463 Russell 3000® Index $10,000 $10,449 $10,892 $13,504 $14,395 $16,337 $17,995 $25,894 $21,617 $23,429 $32,298   2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class M (incl. 3.50% sales charge)   25.80% 12.50% 8.45% Class M (without 3.50% sales charge) 30.36% 13.30% 8.84% Russell Midcap® Value Index 34.03% 9.93% 8.43% Russell 3000® Index 37.86% 14.60% 12.44%   Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 380,025,415
Holdings Count | shares	268
Advisory Fees Paid, Amount	$ 2,906,123
Investment Company Portfolio Turnover	80%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 268 Total Advisory Fee $ Portfolio Turnover 80 %
Holdings [Text Block]	MARKET SECTORS (% of Fund's net assets)     Industrials 19.2   Financials 16.7   Consumer Discretionary 10.3   Materials 10.3   Energy 9.2   Health Care 8.8   Utilities 6.9   Real Estate 5.3   Consumer Staples 5.2   Information Technology 4.3   Communication Services 2.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 86.3 Canada 6.0 United Kingdom 1.2 Germany 1.1 Puerto Rico 0.6 Belgium 0.6 Zambia 0.6 India 0.5 France 0.5 Others 2.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     PG&E Corp 1.2   Vistra Corp 1.2   Ventas Inc 1.0   Global Payments Inc 1.0   Molina Healthcare Inc 0.9   Smurfit WestRock PLC 0.9   Lithia Motors Inc Class A 0.9   Lumentum Holdings Inc 0.8   International Paper Co 0.8   Lamb Weston Holdings Inc 0.8     9.5
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a basic fee rate that may vary by class (subject to a performance adjustment). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B504">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B505">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B506">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>
Fidelity Advisor High Income Advantage Fund - Class Z
Shareholder Report [Line Items]
Fund Name	Fidelity Advisor® High Income Advantage Fund
Class Name	Fidelity Advisor® High Income Advantage Fund Class Z
Trading Symbol	FIQTX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity Advisor® High Income Advantage Fund for the period November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-877-208-0098
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.63 %
Expenses Paid, Amount	$ 69
Expense Ratio, Percent	0.63%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B523">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.&lt;/span>
Line Graph [Table Text Block]	How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE October 2, 2018 through October 31, 2024. Initial investment of $10,000. Class Z $10,000 $9,622 $10,371 $10,661 $13,032 $11,668 $12,304 ICE® BofA® US High Yield Constrained Index $10,000 $9,813 $10,630 $10,890 $12,058 $10,679 $11,299 Bloomberg U.S. Universal Bond Index $10,000 $9,913 $11,039 $11,697 $11,754 $9,898 $10,016   2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Class Z 18.20% 6.99% 6.35% ICE® BofA® US High Yield Constrained Index 16.49% 4.37% 4.62% Bloomberg U.S. Universal Bond Index 11.20% 0.18% 1.79% A   From October 2, 2018 Visit institutional.fidelity.com for more recent performance information.   The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Performance Inception Date	Oct. 02, 2018
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 2,310,946,691
Holdings Count | shares	717
Advisory Fees Paid, Amount	$ 13,652,978
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 717 Total Advisory Fee $ Portfolio Turnover 29 %
Holdings [Text Block]	BBB 4.8 BB 20.7 B 30.9 CCC,CC,C 6.6 Not Rated 2.9 Equities 22.3 Short-Term Investments and Net Other Assets (Liabilities) 11.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.     Corporate Bonds 51.5 Common Stocks 20.1 Bank Loan Obligations 10.1 Preferred Securities 4.1 Alternative Funds 2.2 Asset-Backed Securities 0.2 Short-Term Investments and Net Other Assets (Liabilities) 11.8 ASSET ALLOCATION (% of Fund's net assets)   United States 91.1 Canada 1.9 United Kingdom 1.8 France 1.4 Netherlands 0.5 China 0.5 Luxembourg 0.4 Zambia 0.4 Taiwan 0.3 Others 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets)     TransDigm Inc 2.6   Fidelity Private Credit Company LLC 2.2   Energy Transfer LP 2.1   NVIDIA Corp 1.4   Tenet Healthcare Corp 1.4   LBM Acquisition LLC 1.2   Altice France SA 1.1   eG Global Finance PLC 1.1   Carnival Corp 1.1   Meta Platforms Inc Class A 1.1     15.3
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	The fund's transfer agent and pricing and bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing and bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since November 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by December 30, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com .
Updated Prospectus Phone Number	1-877-208-0098</span>" id="sjs-B538">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098&lt;/span>
Updated Prospectus Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B539">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com&lt;/span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B540">&lt;span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec&lt;/span>

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)

12 Months Ended

60 Months Ended

84 Months Ended

96 Months Ended

120 Months Ended

132 Months Ended

Oct. 31, 2024

Oct. 31, 2024

Oct. 31, 2024

Oct. 31, 2024

Oct. 31, 2024

Oct. 31, 2024

Oct. 31, 2023

Oct. 31, 2022

Oct. 31, 2021

Oct. 31, 2020

Oct. 31, 2019

Oct. 31, 2018

Oct. 31, 2017

Oct. 31, 2016

Oct. 31, 2015

Oct. 31, 2014

C000177521_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

37.86%

C000177521_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

14.60%

C000177521_1_BBIndexMember_LOCMember

Account Value [Line Items]

Average Annual Return, Percent

13.84%

C000048868_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048868_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048868_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048866_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048866_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048866_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048863_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048863_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048863_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048862_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048862_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048862_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048883_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

37.86%

C000048883_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

14.60%

C000048883_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.44%

C000048864_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048864_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048864_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000205047_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000205047_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000205047_1_BBIndexMember_LOCMember

Account Value [Line Items]

Average Annual Return, Percent

1.79%

C000048879_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

37.86%

C000048879_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

14.60%

C000048879_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.44%

C000048881_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

37.86%

C000048881_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

14.60%

C000048881_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.44%

C000048858_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048858_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048858_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048865_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048865_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048865_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048861_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048861_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048861_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048860_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000048860_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000048860_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.82%

C000048882_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

37.86%

C000048882_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

14.60%

C000048882_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.44%

C000205048_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

11.20%

C000205048_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.18%

C000205048_1_BBIndexMember_LOCMember

Account Value [Line Items]

Average Annual Return, Percent

1.79%

C000177521_LG_ClassMember_8YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class Z</span>" id="sjs-E149">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z&lt;/span>

C000177521_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

$ 10,000

C000177521_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

$ 10,891

C000177521_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

$ 10,416

C000177521_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

$ 11,400

C000177521_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

$ 10,734

C000177521_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

$ 17,805

C000177521_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

$ 16,584

C000177521_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 16,773

$ 16,773

$ 16,773

$ 16,773

$ 16,773

$ 16,773

C000177521_LG_1_AdditionalIndexMember_8YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell Midcap® Value Index</span>" id="sjs-E176">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell Midcap® Value Index&lt;/span>

C000177521_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,000

C000177521_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,684

C000177521_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

10,701

C000177521_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,780

C000177521_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

10,963

C000177521_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

16,290

C000177521_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,633

C000177521_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

14,111

14,111

14,111

$ 14,111

14,111

14,111

C000177521_LG_2_AdditionalIndexMember_8YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell 3000® Index</span>" id="sjs-E203">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index&lt;/span>

C000177521_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,000

C000177521_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,422

C000177521_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,175

C000177521_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,818

C000177521_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

15,220

C000177521_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

21,902

C000177521_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

18,284

C000177521_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 19,816

$ 19,816

19,816

$ 19,816

19,816

$ 19,816

C000177521_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

31.21%

C000177521_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

14.06%

C000177521_NoLoadClassMember_2023-11-01_2024-10-31Member

Account Value [Line Items]

Average Annual Return, Percent

10.71%

C000177521_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

34.03%

C000177521_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.93%

C000177521_0_AdditionalIndexMember_LOCMember

Account Value [Line Items]

Average Annual Return, Percent

8.57%

C000048868_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class C</span>" id="sjs-G248">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C&lt;/span>

C000048868_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

$ 10,000

C000048868_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

$ 9,930

C000048868_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

$ 10,477

C000048868_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,725

C000048868_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,694

C000048868_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,466

C000048868_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,669

C000048868_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

15,323

C000048868_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,568

C000048868_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,269

C000048868_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 16,806

$ 16,806

16,806

16,806

16,806

$ 16,806

C000048868_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

ICE® BofA® US High Yield Constrained Index</span>" id="sjs-G284">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index&lt;/span>

C000048868_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048868_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,797

C000048868_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,795

C000048868_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,781

C000048868_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,883

C000048868_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,872

C000048868_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,187

C000048868_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

14,602

C000048868_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,932

C000048868_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

13,683

C000048868_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

15,939

15,939

15,939

15,939

15,939

$ 15,939

C000048868_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G320">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048868_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048868_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048868_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048868_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048868_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048868_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048868_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048868_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048868_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048868_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048868_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048868_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

16.04%

C000048868_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.84%

C000048868_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.33%

C000048868_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

17.04%

C000048868_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.84%

C000048868_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.33%

C000048868_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

16.49%

C000048868_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.37%

C000048868_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.77%

C000048866_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class A</span>" id="sjs-G383">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A&lt;/span>

C000048866_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

9,600

C000048866_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,606

C000048866_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,211

C000048866_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,513

C000048866_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,571

C000048866_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,428

C000048866_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,728

C000048866_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

15,509

C000048866_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,841

C000048866_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,555

C000048866_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 17,144

$ 17,144

17,144

17,144

$ 17,144

$ 17,144

C000048866_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

ICE® BofA® US High Yield Constrained Index</span>" id="sjs-G419">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index&lt;/span>

C000048866_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048866_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,797

C000048866_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,795

C000048866_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,781

C000048866_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,883

C000048866_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,872

C000048866_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,187

C000048866_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

14,602

C000048866_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,932

C000048866_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

13,683

C000048866_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

15,939

15,939

15,939

15,939

15,939

$ 15,939

C000048866_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G455">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048866_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048866_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048866_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048866_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048866_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048866_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048866_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048866_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048866_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048866_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048866_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048866_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

13.07%

C000048866_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.78%

C000048866_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.54%

C000048866_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

17.78%

C000048866_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.64%

C000048866_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.97%

C000048866_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

16.49%

C000048866_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.37%

C000048866_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.77%

C000048863_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Fidelity® Floating Rate High Income Fund</span>" id="sjs-G518">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Floating Rate High Income Fund&lt;/span>

C000048863_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048863_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,964

C000048863_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,590

C000048863_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,088

C000048863_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,533

C000048863_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,870

C000048863_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,853

C000048863_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,988

C000048863_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,756

C000048863_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,158

C000048863_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 15,597

$ 15,597

15,597

15,597

$ 15,597

$ 15,597

C000048863_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Morningstar® LSTA® US Performing Loans</span>" id="sjs-G554">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Morningstar® LSTA® US Performing Loans&lt;/span>

C000048863_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048863_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,151

C000048863_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,824

C000048863_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,392

C000048863_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,936

C000048863_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,235

C000048863_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,491

C000048863_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

13,602

C000048863_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,349

C000048863_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,977

C000048863_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

16,603

16,603

16,603

16,603

16,603

$ 16,603

C000048863_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G590">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048863_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048863_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048863_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048863_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048863_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048863_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048863_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048863_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048863_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048863_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048863_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048863_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.16%

C000048863_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.61%

C000048863_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.54%

C000048863_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.86%

C000048863_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.29%

C000048863_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.20%

C000048862_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class I</span>" id="sjs-G644">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I&lt;/span>

C000048862_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048862_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,970

C000048862_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,591

C000048862_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,083

C000048862_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,508

C000048862_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,839

C000048862_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,816

C000048862_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,942

C000048862_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,718

C000048862_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,097

C000048862_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 15,525

$ 15,525

15,525

15,525

$ 15,525

$ 15,525

C000048862_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Morningstar® LSTA® US Performing Loans</span>" id="sjs-G680">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Morningstar® LSTA® US Performing Loans&lt;/span>

C000048862_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048862_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,151

C000048862_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,824

C000048862_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,392

C000048862_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,936

C000048862_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,235

C000048862_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,491

C000048862_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

13,602

C000048862_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,349

C000048862_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,977

C000048862_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

16,603

16,603

16,603

16,603

16,603

$ 16,603

C000048862_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G716">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048862_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048862_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048862_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048862_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048862_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048862_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048862_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048862_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048862_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048862_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048862_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048862_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.13%

C000048862_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.57%

C000048862_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.50%

C000048862_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.86%

C000048862_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.29%

C000048862_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.20%

C000048883_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class I</span>" id="sjs-G770">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I&lt;/span>

C000048883_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048883_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,013

C000048883_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,295

C000048883_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

12,307

C000048883_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,755

C000048883_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,852

C000048883_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,087

C000048883_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

20,026

C000048883_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

18,626

C000048883_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

18,806

C000048883_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 24,643

$ 24,643

24,643

24,643

$ 24,643

$ 24,643

C000048883_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell Midcap® Value Index</span>" id="sjs-G806">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell Midcap® Value Index&lt;/span>

C000048883_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048883_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,047

C000048883_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,834

C000048883_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

12,689

C000048883_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

12,710

C000048883_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

13,990

C000048883_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,020

C000048883_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

19,347

C000048883_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

17,379

C000048883_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

16,759

C000048883_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

22,463

22,463

22,463

22,463

22,463

$ 22,463

C000048883_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell 3000® Index</span>" id="sjs-G842">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index&lt;/span>

C000048883_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048883_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,449

C000048883_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,892

C000048883_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

13,504

C000048883_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

14,395

C000048883_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

16,337

C000048883_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

17,995

C000048883_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

25,894

C000048883_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

21,617

C000048883_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

23,429

C000048883_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 32,298

$ 32,298

32,298

32,298

$ 32,298

$ 32,298

C000048883_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

31.04%

C000048883_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

13.90%

C000048883_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.44%

C000048883_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

34.03%

C000048883_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.93%

C000048883_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.43%

C000048864_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class M</span>" id="sjs-G896">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M&lt;/span>

C000048864_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

9,600

C000048864_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,617

C000048864_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,223

C000048864_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,523

C000048864_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,584

C000048864_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,440

C000048864_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,742

C000048864_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

15,525

C000048864_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,856

C000048864_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,572

C000048864_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 17,168

$ 17,168

17,168

17,168

$ 17,168

$ 17,168

C000048864_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

ICE® BofA® US High Yield Constrained Index</span>" id="sjs-G932">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index&lt;/span>

C000048864_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048864_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,797

C000048864_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,795

C000048864_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,781

C000048864_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,883

C000048864_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,872

C000048864_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,187

C000048864_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

14,602

C000048864_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,932

C000048864_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

13,683

C000048864_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

15,939

15,939

15,939

15,939

15,939

$ 15,939

C000048864_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G968">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048864_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048864_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048864_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048864_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048864_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048864_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048864_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048864_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048864_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048864_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048864_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

$ 11,974

11,974

$ 11,974

$ 11,974

C000048864_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

13.10%

C000048864_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.79%

C000048864_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.55%

C000048864_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

17.82%

C000048864_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.65%

C000048864_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.98%

C000048864_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

16.49%

C000048864_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.37%

C000048864_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.77%

C000205047_LG_ClassMember_7YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class Z</span>" id="sjs-D1031">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z&lt;/span>

C000205047_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,000

C000205047_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

9,974

C000205047_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

10,271

C000205047_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

10,272

C000205047_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,249

C000205047_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

11,066

C000205047_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 12,289

$ 12,289

$ 12,289

12,289

$ 12,289

12,289

C000205047_LG_1_AdditionalIndexMember_7YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Morningstar® LSTA® US Performing Loans</span>" id="sjs-D1055">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Morningstar® LSTA® US Performing Loans&lt;/span>

C000205047_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,000

C000205047_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

9,991

C000205047_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

10,242

C000205047_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

10,456

C000205047_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,386

C000205047_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

11,174

C000205047_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

12,536

12,536

$ 12,536

12,536

12,536

12,536

C000205047_LG_2_AdditionalIndexMember_7YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-D1079">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000205047_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,000

C000205047_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

9,913

C000205047_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,039

C000205047_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

11,697

C000205047_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,754

C000205047_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

9,898

C000205047_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 10,016

$ 10,016

$ 10,016

10,016

10,016

$ 10,016

C000205047_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.24%

C000205047_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.69%

C000205047_NoLoadClassMember_2023-11-01_2024-10-31Member

Account Value [Line Items]

Average Annual Return, Percent

5.12%

C000205047_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.86%

C000205047_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.29%

C000205047_0_AdditionalIndexMember_LOCMember

Account Value [Line Items]

Average Annual Return, Percent

5.56%

C000048879_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class A</span>" id="sjs-G1121">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A&lt;/span>

C000048879_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

9,425

C000048879_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,414

C000048879_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

9,652

C000048879_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,497

C000048879_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,953

C000048879_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,939

C000048879_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,194

C000048879_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

18,493

C000048879_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

17,152

C000048879_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

17,277

C000048879_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 22,584

$ 22,584

22,584

22,584

22,584

$ 22,584

C000048879_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell Midcap® Value Index</span>" id="sjs-G1157">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell Midcap® Value Index&lt;/span>

C000048879_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048879_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,047

C000048879_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,834

C000048879_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

12,689

C000048879_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

12,710

C000048879_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

13,990

C000048879_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,020

C000048879_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

19,347

C000048879_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

17,379

C000048879_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

16,759

C000048879_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

22,463

22,463

22,463

22,463

22,463

$ 22,463

C000048879_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell 3000® Index</span>" id="sjs-G1193">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index&lt;/span>

C000048879_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048879_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,449

C000048879_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,892

C000048879_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

13,504

C000048879_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

14,395

C000048879_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

16,337

C000048879_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

17,995

C000048879_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

25,894

C000048879_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

21,617

C000048879_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

23,429

C000048879_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 32,298

$ 32,298

32,298

32,298

$ 32,298

$ 32,298

C000048879_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

23.20%

C000048879_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.26%

C000048879_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.49%

C000048879_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

30.72%

C000048879_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

13.60%

C000048879_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.13%

C000048879_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

34.03%

C000048879_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.93%

C000048879_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.43%

C000048881_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class C</span>" id="sjs-G1256">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C&lt;/span>

C000048881_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048881_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,911

C000048881_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,082

C000048881_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,917

C000048881_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,256

C000048881_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,171

C000048881_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,317

C000048881_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

18,557

C000048881_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

17,084

C000048881_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

17,208

C000048881_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 22,494

$ 22,494

22,494

22,494

$ 22,494

$ 22,494

C000048881_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell Midcap® Value Index</span>" id="sjs-G1292">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell Midcap® Value Index&lt;/span>

C000048881_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048881_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,047

C000048881_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,834

C000048881_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

12,689

C000048881_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

12,710

C000048881_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

13,990

C000048881_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,020

C000048881_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

19,347

C000048881_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

17,379

C000048881_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

16,759

C000048881_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

22,463

22,463

22,463

22,463

22,463

$ 22,463

C000048881_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell 3000® Index</span>" id="sjs-G1328">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index&lt;/span>

C000048881_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048881_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,449

C000048881_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,892

C000048881_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

13,504

C000048881_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

14,395

C000048881_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

16,337

C000048881_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

17,995

C000048881_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

25,894

C000048881_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

21,617

C000048881_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

23,429

C000048881_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 32,298

$ 32,298

32,298

32,298

$ 32,298

$ 32,298

C000048881_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

28.70%

C000048881_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.73%

C000048881_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.44%

C000048881_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

29.70%

C000048881_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.73%

C000048881_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.44%

C000048881_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

34.03%

C000048881_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.93%

C000048881_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.43%

C000048858_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class A</span>" id="sjs-G1391">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A&lt;/span>

C000048858_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

9,725

C000048858_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,674

C000048858_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,252

C000048858_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,703

C000048858_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,089

C000048858_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,380

C000048858_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,329

C000048858_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,376

C000048858_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,133

C000048858_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

13,413

C000048858_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 14,733

$ 14,733

14,733

14,733

$ 14,733

$ 14,733

C000048858_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Morningstar® LSTA® US Performing Loans</span>" id="sjs-G1427">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Morningstar® LSTA® US Performing Loans&lt;/span>

C000048858_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048858_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,151

C000048858_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,824

C000048858_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,392

C000048858_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,936

C000048858_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,235

C000048858_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,491

C000048858_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

13,602

C000048858_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,349

C000048858_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,977

C000048858_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

16,603

16,603

16,603

16,603

16,603

$ 16,603

C000048858_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G1463">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048858_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048858_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048858_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048858_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048858_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048858_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048858_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048858_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048858_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048858_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048858_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048858_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.82%

C000048858_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.72%

C000048858_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

3.95%

C000048858_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.85%

C000048858_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.30%

C000048858_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.24%

C000048858_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.86%

C000048858_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.29%

C000048858_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.20%

C000048865_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class I</span>" id="sjs-G1526">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I&lt;/span>

C000048865_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048865_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,031

C000048865_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,686

C000048865_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

12,082

C000048865_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

12,178

C000048865_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

13,113

C000048865_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,466

C000048865_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

16,447

C000048865_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

14,710

C000048865_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

15,497

C000048865_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 18,315

$ 18,315

18,315

18,315

$ 18,315

$ 18,315

C000048865_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

ICE® BofA® US High Yield Constrained Index</span>" id="sjs-G1562">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index&lt;/span>

C000048865_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048865_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,797

C000048865_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,795

C000048865_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,781

C000048865_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,883

C000048865_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,872

C000048865_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,187

C000048865_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

14,602

C000048865_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,932

C000048865_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

13,683

C000048865_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

15,939

15,939

15,939

15,939

15,939

$ 15,939

C000048865_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G1598">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048865_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048865_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048865_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048865_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048865_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048865_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048865_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048865_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048865_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048865_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048865_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048865_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

18.18%

C000048865_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.91%

C000048865_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.24%

C000048865_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

16.49%

C000048865_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.37%

C000048865_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.77%

C000048861_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class M</span>" id="sjs-G1652">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M&lt;/span>

C000048861_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

9,725

C000048861_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,655

C000048861_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,223

C000048861_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,670

C000048861_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,053

C000048861_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,354

C000048861_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,301

C000048861_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,332

C000048861_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,089

C000048861_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

13,381

C000048861_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 14,700

$ 14,700

14,700

14,700

$ 14,700

$ 14,700

C000048861_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Morningstar® LSTA® US Performing Loans</span>" id="sjs-G1688">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Morningstar® LSTA® US Performing Loans&lt;/span>

C000048861_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048861_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,151

C000048861_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,824

C000048861_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,392

C000048861_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,936

C000048861_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,235

C000048861_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,491

C000048861_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

13,602

C000048861_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,349

C000048861_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,977

C000048861_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

16,603

16,603

16,603

16,603

16,603

$ 16,603

C000048861_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G1724">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048861_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048861_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048861_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048861_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048861_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048861_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048861_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048861_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048861_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048861_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048861_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048861_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.84%

C000048861_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.72%

C000048861_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

3.93%

C000048861_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.86%

C000048861_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.30%

C000048861_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.22%

C000048861_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.86%

C000048861_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.29%

C000048861_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.20%

C000048860_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class C</span>" id="sjs-G1787">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C&lt;/span>

C000048860_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048860_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,862

C000048860_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,374

C000048860_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,761

C000048860_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,065

C000048860_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,271

C000048860_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,137

C000048860_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,075

C000048860_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,736

C000048860_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

12,974

C000048860_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 14,251

$ 14,251

14,251

14,251

$ 14,251

$ 14,251

C000048860_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Morningstar® LSTA® US Performing Loans</span>" id="sjs-G1823">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Morningstar® LSTA® US Performing Loans&lt;/span>

C000048860_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048860_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,151

C000048860_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,824

C000048860_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,392

C000048860_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,936

C000048860_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,235

C000048860_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,491

C000048860_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

13,602

C000048860_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,349

C000048860_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

14,977

C000048860_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

16,603

16,603

16,603

16,603

16,603

$ 16,603

C000048860_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-G1859">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000048860_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048860_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,167

C000048860_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,682

C000048860_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

10,870

C000048860_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,658

C000048860_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,869

C000048860_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,576

C000048860_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,636

C000048860_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

10,641

C000048860_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,768

C000048860_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 11,974

$ 11,974

11,974

11,974

$ 11,974

$ 11,974

C000048860_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.03%

C000048860_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.51%

C000048860_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

3.61%

C000048860_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.03%

C000048860_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.51%

C000048860_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

3.61%

C000048860_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

10.86%

C000048860_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.29%

C000048860_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.20%

C000048882_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class M</span>" id="sjs-G1922">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M&lt;/span>

C000048882_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

9,650

C000048882_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

9,608

C000048882_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

9,827

C000048882_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,673

C000048882_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,088

C000048882_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,058

C000048882_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

11,268

C000048882_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

18,571

C000048882_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

17,186

C000048882_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

17,271

C000048882_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 22,514

$ 22,514

22,514

22,514

$ 22,514

$ 22,514

C000048882_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell Midcap® Value Index</span>" id="sjs-G1958">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell Midcap® Value Index&lt;/span>

C000048882_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000048882_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,047

C000048882_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,834

C000048882_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

12,689

C000048882_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

12,710

C000048882_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

13,990

C000048882_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

13,020

C000048882_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

19,347

C000048882_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

17,379

C000048882_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

16,759

C000048882_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

22,463

22,463

22,463

22,463

22,463

$ 22,463

C000048882_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Russell 3000® Index</span>" id="sjs-G1994">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index&lt;/span>

C000048882_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

$ 10,000

C000048882_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

$ 10,449

C000048882_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

$ 10,892

C000048882_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

$ 13,504

C000048882_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

14,395

C000048882_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

16,337

C000048882_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

17,995

C000048882_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

25,894

C000048882_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

21,617

C000048882_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

23,429

C000048882_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 32,298

$ 32,298

$ 32,298

32,298

$ 32,298

$ 32,298

C000048882_ClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

25.80%

C000048882_ClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

12.50%

C000048882_ClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.45%

C000048882_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

30.36%

C000048882_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

13.30%

C000048882_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.84%

C000048882_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

34.03%

C000048882_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

9.93%

C000048882_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

8.43%

C000205048_LG_ClassMember_7YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Class Z</span>" id="sjs-D2057">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z&lt;/span>

C000205048_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,000

C000205048_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

9,622

C000205048_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

10,371

C000205048_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

10,661

C000205048_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

13,032

C000205048_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

11,668

C000205048_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 12,304

$ 12,304

$ 12,304

12,304

$ 12,304

12,304

C000205048_LG_1_AdditionalIndexMember_7YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

ICE® BofA® US High Yield Constrained Index</span>" id="sjs-D2081">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index&lt;/span>

C000205048_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

10,000

C000205048_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

9,813

C000205048_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

10,630

C000205048_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

10,890

C000205048_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

12,058

C000205048_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

10,679

C000205048_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

11,299

11,299

$ 11,299

11,299

11,299

11,299

C000205048_LG_2_AdditionalIndexMember_7YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Universal Bond Index</span>" id="sjs-D2105">&lt;span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index&lt;/span>

C000205048_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

$ 10,000

C000205048_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

$ 9,913

C000205048_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

$ 11,039

C000205048_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

$ 11,697

C000205048_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

$ 11,754

C000205048_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

$ 9,898

C000205048_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 10,016

$ 10,016

$ 10,016

$ 10,016

$ 10,016

$ 10,016

C000205048_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

18.20%

C000205048_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.99%

C000205048_NoLoadClassMember_2023-11-01_2024-10-31Member

Account Value [Line Items]

Average Annual Return, Percent

6.35%

C000205048_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

16.49%

C000205048_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

4.37%

C000205048_0_AdditionalIndexMember_LOCMember

Account Value [Line Items]

Average Annual Return, Percent

4.62%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Oct. 31, 2024
Fidelity Advisor Value Fund - Class Z | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class Z | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class Z | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class Z | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class Z | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class Z | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class Z | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class Z | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class Z | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class Z | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class Z | MSFinancialsSectorMember
Holdings [Line Items]
Percent of Net Asset Value	16.70%
Fidelity Advisor Value Fund - Class Z | Information Technology Member
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Fidelity Advisor Value Fund - Class Z | Healthcare Sector
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Fidelity Advisor Value Fund - Class Z | Real Estate Sector
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Fidelity Advisor Value Fund - Class Z | Industrial Sector Member
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Fidelity Advisor Value Fund - Class Z | Materials Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class Z | Consumer Discretionary Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class Z | Consumer Staples Sector Member
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Fidelity Advisor Value Fund - Class Z | Communications Sector Member
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Fidelity Advisor Value Fund - Class Z | Energy Sector
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Fidelity Advisor Value Fund - Class Z | Utilities Sector Member
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Fidelity Advisor Value Fund - Class Z | United States
Holdings [Line Items]
Percent of Net Asset Value	86.30%
Fidelity Advisor Value Fund - Class Z | Canada
Holdings [Line Items]
Percent of Net Asset Value	6%
Fidelity Advisor Value Fund - Class Z | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class Z | Germany
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Value Fund - Class Z | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class Z | Belgium
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class Z | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class Z | India
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class Z | France
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class Z | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Value Fund - Class Z | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	99%
Fidelity Advisor Value Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor High Income Advantage Fund - Class C | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor High Income Advantage Fund - Class C | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class C | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Fidelity Advisor High Income Advantage Fund - Class C | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class C | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class C | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor High Income Advantage Fund - Class C | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class C | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class C | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class C | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class C | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity Advisor High Income Advantage Fund - Class C | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	20.70%
Fidelity Advisor High Income Advantage Fund - Class C | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	30.90%
Fidelity Advisor High Income Advantage Fund - Class C | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Fidelity Advisor High Income Advantage Fund - Class C | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Fidelity Advisor High Income Advantage Fund - Class C | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	22.30%
Fidelity Advisor High Income Advantage Fund - Class C | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class C | United States
Holdings [Line Items]
Percent of Net Asset Value	91.10%
Fidelity Advisor High Income Advantage Fund - Class C | Canada
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Fidelity Advisor High Income Advantage Fund - Class C | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity Advisor High Income Advantage Fund - Class C | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class C | France
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class C | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Fidelity Advisor High Income Advantage Fund - Class C | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class C | China
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class C | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class C | Taiwan
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor High Income Advantage Fund - Class C | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	20.10%
Fidelity Advisor High Income Advantage Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class C | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	51.50%
Fidelity Advisor High Income Advantage Fund - Class C | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Fidelity Advisor High Income Advantage Fund - Class C | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Fidelity Advisor High Income Advantage Fund - Class C | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class C | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor High Income Advantage Fund - Class A | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor High Income Advantage Fund - Class A | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class A | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Fidelity Advisor High Income Advantage Fund - Class A | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class A | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class A | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor High Income Advantage Fund - Class A | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class A | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class A | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class A | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class A | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity Advisor High Income Advantage Fund - Class A | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	20.70%
Fidelity Advisor High Income Advantage Fund - Class A | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	30.90%
Fidelity Advisor High Income Advantage Fund - Class A | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Fidelity Advisor High Income Advantage Fund - Class A | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Fidelity Advisor High Income Advantage Fund - Class A | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	22.30%
Fidelity Advisor High Income Advantage Fund - Class A | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class A | United States
Holdings [Line Items]
Percent of Net Asset Value	91.10%
Fidelity Advisor High Income Advantage Fund - Class A | Canada
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Fidelity Advisor High Income Advantage Fund - Class A | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity Advisor High Income Advantage Fund - Class A | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class A | France
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class A | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Fidelity Advisor High Income Advantage Fund - Class A | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class A | China
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class A | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class A | Taiwan
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor High Income Advantage Fund - Class A | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	20.10%
Fidelity Advisor High Income Advantage Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class A | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	51.50%
Fidelity Advisor High Income Advantage Fund - Class A | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Fidelity Advisor High Income Advantage Fund - Class A | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Fidelity Advisor High Income Advantage Fund - Class A | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class A | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Floating Rate High Income Fund | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Floating Rate High Income Fund | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Floating Rate High Income Fund | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Floating Rate High Income Fund | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Floating Rate High Income Fund | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Floating Rate High Income Fund | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Floating Rate High Income Fund | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Floating Rate High Income Fund | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Floating Rate High Income Fund | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Floating Rate High Income Fund | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Floating Rate High Income Fund | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity Floating Rate High Income Fund | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	22.50%
Fidelity Floating Rate High Income Fund | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	59.80%
Fidelity Floating Rate High Income Fund | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.10%
Fidelity Floating Rate High Income Fund | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Fidelity Floating Rate High Income Fund | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Fidelity Floating Rate High Income Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Floating Rate High Income Fund | United States
Holdings [Line Items]
Percent of Net Asset Value	90.30%
Fidelity Floating Rate High Income Fund | Canada
Holdings [Line Items]
Percent of Net Asset Value	2%
Fidelity Floating Rate High Income Fund | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Fidelity Floating Rate High Income Fund | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Fidelity Floating Rate High Income Fund | France
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Floating Rate High Income Fund | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Floating Rate High Income Fund | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Floating Rate High Income Fund | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Floating Rate High Income Fund | Ireland
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Floating Rate High Income Fund | GrandCaymanUKOverseasTerMember
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Floating Rate High Income Fund | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Fidelity Floating Rate High Income Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Floating Rate High Income Fund | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Fidelity Floating Rate High Income Fund | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	90.10%
Fidelity Floating Rate High Income Fund | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Floating Rate High Income Fund | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Floating Rate High Income Fund | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class I | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class I | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity Advisor Floating Rate High Income Fund - Class I | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	22.50%
Fidelity Advisor Floating Rate High Income Fund - Class I | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	59.80%
Fidelity Advisor Floating Rate High Income Fund - Class I | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.10%
Fidelity Advisor Floating Rate High Income Fund - Class I | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Fidelity Advisor Floating Rate High Income Fund - Class I | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Fidelity Advisor Floating Rate High Income Fund - Class I | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class I | United States
Holdings [Line Items]
Percent of Net Asset Value	90.30%
Fidelity Advisor Floating Rate High Income Fund - Class I | Canada
Holdings [Line Items]
Percent of Net Asset Value	2%
Fidelity Advisor Floating Rate High Income Fund - Class I | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Fidelity Advisor Floating Rate High Income Fund - Class I | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Fidelity Advisor Floating Rate High Income Fund - Class I | France
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class I | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class I | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Floating Rate High Income Fund - Class I | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Floating Rate High Income Fund - Class I | Ireland
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class I | GrandCaymanUKOverseasTerMember
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class I | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Fidelity Advisor Floating Rate High Income Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class I | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Fidelity Advisor Floating Rate High Income Fund - Class I | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	90.10%
Fidelity Advisor Floating Rate High Income Fund - Class I | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor Floating Rate High Income Fund - Class I | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class I | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor Value Fund - Class I | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class I | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class I | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class I | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class I | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class I | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class I | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class I | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class I | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class I | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class I | MSFinancialsSectorMember
Holdings [Line Items]
Percent of Net Asset Value	16.70%
Fidelity Advisor Value Fund - Class I | Information Technology Member
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Fidelity Advisor Value Fund - Class I | Healthcare Sector
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Fidelity Advisor Value Fund - Class I | Real Estate Sector
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Fidelity Advisor Value Fund - Class I | Industrial Sector Member
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Fidelity Advisor Value Fund - Class I | Materials Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class I | Consumer Discretionary Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class I | Consumer Staples Sector Member
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Fidelity Advisor Value Fund - Class I | Communications Sector Member
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Fidelity Advisor Value Fund - Class I | Energy Sector
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Fidelity Advisor Value Fund - Class I | Utilities Sector Member
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Fidelity Advisor Value Fund - Class I | United States
Holdings [Line Items]
Percent of Net Asset Value	86.30%
Fidelity Advisor Value Fund - Class I | Canada
Holdings [Line Items]
Percent of Net Asset Value	6%
Fidelity Advisor Value Fund - Class I | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class I | Germany
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Value Fund - Class I | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class I | Belgium
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class I | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class I | India
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class I | France
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class I | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Value Fund - Class I | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	99%
Fidelity Advisor Value Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor High Income Advantage Fund - Class M | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor High Income Advantage Fund - Class M | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class M | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Fidelity Advisor High Income Advantage Fund - Class M | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class M | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class M | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor High Income Advantage Fund - Class M | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class M | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class M | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class M | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class M | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity Advisor High Income Advantage Fund - Class M | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	20.70%
Fidelity Advisor High Income Advantage Fund - Class M | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	30.90%
Fidelity Advisor High Income Advantage Fund - Class M | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Fidelity Advisor High Income Advantage Fund - Class M | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Fidelity Advisor High Income Advantage Fund - Class M | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	22.30%
Fidelity Advisor High Income Advantage Fund - Class M | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class M | United States
Holdings [Line Items]
Percent of Net Asset Value	91.10%
Fidelity Advisor High Income Advantage Fund - Class M | Canada
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Fidelity Advisor High Income Advantage Fund - Class M | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity Advisor High Income Advantage Fund - Class M | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class M | France
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class M | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Fidelity Advisor High Income Advantage Fund - Class M | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class M | China
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class M | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class M | Taiwan
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor High Income Advantage Fund - Class M | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	20.10%
Fidelity Advisor High Income Advantage Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class M | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	51.50%
Fidelity Advisor High Income Advantage Fund - Class M | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Fidelity Advisor High Income Advantage Fund - Class M | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Fidelity Advisor High Income Advantage Fund - Class M | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class M | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class Z | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class Z | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity Advisor Floating Rate High Income Fund - Class Z | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	22.50%
Fidelity Advisor Floating Rate High Income Fund - Class Z | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	59.80%
Fidelity Advisor Floating Rate High Income Fund - Class Z | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.10%
Fidelity Advisor Floating Rate High Income Fund - Class Z | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Fidelity Advisor Floating Rate High Income Fund - Class Z | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Fidelity Advisor Floating Rate High Income Fund - Class Z | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class Z | United States
Holdings [Line Items]
Percent of Net Asset Value	90.30%
Fidelity Advisor Floating Rate High Income Fund - Class Z | Canada
Holdings [Line Items]
Percent of Net Asset Value	2%
Fidelity Advisor Floating Rate High Income Fund - Class Z | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Fidelity Advisor Floating Rate High Income Fund - Class Z | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Fidelity Advisor Floating Rate High Income Fund - Class Z | France
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class Z | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class Z | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Floating Rate High Income Fund - Class Z | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Floating Rate High Income Fund - Class Z | Ireland
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class Z | GrandCaymanUKOverseasTerMember
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class Z | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Fidelity Advisor Floating Rate High Income Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class Z | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Fidelity Advisor Floating Rate High Income Fund - Class Z | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	90.10%
Fidelity Advisor Floating Rate High Income Fund - Class Z | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor Floating Rate High Income Fund - Class Z | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class Z | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor Value Fund - Class A | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class A | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class A | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class A | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class A | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class A | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class A | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class A | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class A | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class A | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class A | MSFinancialsSectorMember
Holdings [Line Items]
Percent of Net Asset Value	16.70%
Fidelity Advisor Value Fund - Class A | Information Technology Member
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Fidelity Advisor Value Fund - Class A | Healthcare Sector
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Fidelity Advisor Value Fund - Class A | Real Estate Sector
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Fidelity Advisor Value Fund - Class A | Industrial Sector Member
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Fidelity Advisor Value Fund - Class A | Materials Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class A | Consumer Discretionary Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class A | Consumer Staples Sector Member
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Fidelity Advisor Value Fund - Class A | Communications Sector Member
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Fidelity Advisor Value Fund - Class A | Energy Sector
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Fidelity Advisor Value Fund - Class A | Utilities Sector Member
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Fidelity Advisor Value Fund - Class A | United States
Holdings [Line Items]
Percent of Net Asset Value	86.30%
Fidelity Advisor Value Fund - Class A | Canada
Holdings [Line Items]
Percent of Net Asset Value	6%
Fidelity Advisor Value Fund - Class A | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class A | Germany
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Value Fund - Class A | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class A | Belgium
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class A | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class A | India
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class A | France
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class A | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Value Fund - Class A | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	99%
Fidelity Advisor Value Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class C | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class C | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class C | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class C | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class C | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class C | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class C | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class C | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class C | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class C | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class C | MSFinancialsSectorMember
Holdings [Line Items]
Percent of Net Asset Value	16.70%
Fidelity Advisor Value Fund - Class C | Information Technology Member
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Fidelity Advisor Value Fund - Class C | Healthcare Sector
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Fidelity Advisor Value Fund - Class C | Real Estate Sector
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Fidelity Advisor Value Fund - Class C | Industrial Sector Member
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Fidelity Advisor Value Fund - Class C | Materials Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class C | Consumer Discretionary Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class C | Consumer Staples Sector Member
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Fidelity Advisor Value Fund - Class C | Communications Sector Member
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Fidelity Advisor Value Fund - Class C | Energy Sector
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Fidelity Advisor Value Fund - Class C | Utilities Sector Member
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Fidelity Advisor Value Fund - Class C | United States
Holdings [Line Items]
Percent of Net Asset Value	86.30%
Fidelity Advisor Value Fund - Class C | Canada
Holdings [Line Items]
Percent of Net Asset Value	6%
Fidelity Advisor Value Fund - Class C | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class C | Germany
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Value Fund - Class C | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class C | Belgium
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class C | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class C | India
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class C | France
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class C | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Value Fund - Class C | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	99%
Fidelity Advisor Value Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class A | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class A | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity Advisor Floating Rate High Income Fund - Class A | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	22.50%
Fidelity Advisor Floating Rate High Income Fund - Class A | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	59.80%
Fidelity Advisor Floating Rate High Income Fund - Class A | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.10%
Fidelity Advisor Floating Rate High Income Fund - Class A | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Fidelity Advisor Floating Rate High Income Fund - Class A | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Fidelity Advisor Floating Rate High Income Fund - Class A | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class A | United States
Holdings [Line Items]
Percent of Net Asset Value	90.30%
Fidelity Advisor Floating Rate High Income Fund - Class A | Canada
Holdings [Line Items]
Percent of Net Asset Value	2%
Fidelity Advisor Floating Rate High Income Fund - Class A | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Fidelity Advisor Floating Rate High Income Fund - Class A | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Fidelity Advisor Floating Rate High Income Fund - Class A | France
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class A | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class A | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Floating Rate High Income Fund - Class A | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Floating Rate High Income Fund - Class A | Ireland
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class A | GrandCaymanUKOverseasTerMember
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class A | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Fidelity Advisor Floating Rate High Income Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class A | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Fidelity Advisor Floating Rate High Income Fund - Class A | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	90.10%
Fidelity Advisor Floating Rate High Income Fund - Class A | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor Floating Rate High Income Fund - Class A | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class A | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor High Income Advantage Fund - Class I | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor High Income Advantage Fund - Class I | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class I | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Fidelity Advisor High Income Advantage Fund - Class I | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class I | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class I | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor High Income Advantage Fund - Class I | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class I | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class I | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class I | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class I | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity Advisor High Income Advantage Fund - Class I | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	20.70%
Fidelity Advisor High Income Advantage Fund - Class I | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	30.90%
Fidelity Advisor High Income Advantage Fund - Class I | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Fidelity Advisor High Income Advantage Fund - Class I | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Fidelity Advisor High Income Advantage Fund - Class I | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	22.30%
Fidelity Advisor High Income Advantage Fund - Class I | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class I | United States
Holdings [Line Items]
Percent of Net Asset Value	91.10%
Fidelity Advisor High Income Advantage Fund - Class I | Canada
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Fidelity Advisor High Income Advantage Fund - Class I | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity Advisor High Income Advantage Fund - Class I | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class I | France
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class I | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Fidelity Advisor High Income Advantage Fund - Class I | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class I | China
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class I | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class I | Taiwan
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor High Income Advantage Fund - Class I | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	20.10%
Fidelity Advisor High Income Advantage Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class I | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	51.50%
Fidelity Advisor High Income Advantage Fund - Class I | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Fidelity Advisor High Income Advantage Fund - Class I | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Fidelity Advisor High Income Advantage Fund - Class I | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class I | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class M | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class M | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity Advisor Floating Rate High Income Fund - Class M | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	22.50%
Fidelity Advisor Floating Rate High Income Fund - Class M | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	59.80%
Fidelity Advisor Floating Rate High Income Fund - Class M | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.10%
Fidelity Advisor Floating Rate High Income Fund - Class M | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Fidelity Advisor Floating Rate High Income Fund - Class M | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Fidelity Advisor Floating Rate High Income Fund - Class M | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class M | United States
Holdings [Line Items]
Percent of Net Asset Value	90.30%
Fidelity Advisor Floating Rate High Income Fund - Class M | Canada
Holdings [Line Items]
Percent of Net Asset Value	2%
Fidelity Advisor Floating Rate High Income Fund - Class M | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Fidelity Advisor Floating Rate High Income Fund - Class M | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Fidelity Advisor Floating Rate High Income Fund - Class M | France
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class M | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class M | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Floating Rate High Income Fund - Class M | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Floating Rate High Income Fund - Class M | Ireland
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class M | GrandCaymanUKOverseasTerMember
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class M | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Fidelity Advisor Floating Rate High Income Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class M | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Fidelity Advisor Floating Rate High Income Fund - Class M | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	90.10%
Fidelity Advisor Floating Rate High Income Fund - Class M | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor Floating Rate High Income Fund - Class M | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class M | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class C | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Floating Rate High Income Fund - Class C | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity Advisor Floating Rate High Income Fund - Class C | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	22.50%
Fidelity Advisor Floating Rate High Income Fund - Class C | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	59.80%
Fidelity Advisor Floating Rate High Income Fund - Class C | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.10%
Fidelity Advisor Floating Rate High Income Fund - Class C | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Fidelity Advisor Floating Rate High Income Fund - Class C | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Fidelity Advisor Floating Rate High Income Fund - Class C | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class C | United States
Holdings [Line Items]
Percent of Net Asset Value	90.30%
Fidelity Advisor Floating Rate High Income Fund - Class C | Canada
Holdings [Line Items]
Percent of Net Asset Value	2%
Fidelity Advisor Floating Rate High Income Fund - Class C | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Fidelity Advisor Floating Rate High Income Fund - Class C | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Fidelity Advisor Floating Rate High Income Fund - Class C | France
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class C | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Floating Rate High Income Fund - Class C | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Floating Rate High Income Fund - Class C | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Floating Rate High Income Fund - Class C | Ireland
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class C | GrandCaymanUKOverseasTerMember
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor Floating Rate High Income Fund - Class C | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Fidelity Advisor Floating Rate High Income Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Floating Rate High Income Fund - Class C | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Fidelity Advisor Floating Rate High Income Fund - Class C | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	90.10%
Fidelity Advisor Floating Rate High Income Fund - Class C | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor Floating Rate High Income Fund - Class C | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Floating Rate High Income Fund - Class C | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Fidelity Advisor Value Fund - Class M | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class M | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class M | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class M | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor Value Fund - Class M | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class M | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class M | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Advisor Value Fund - Class M | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class M | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class M | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Fidelity Advisor Value Fund - Class M | MSFinancialsSectorMember
Holdings [Line Items]
Percent of Net Asset Value	16.70%
Fidelity Advisor Value Fund - Class M | Information Technology Member
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Fidelity Advisor Value Fund - Class M | Healthcare Sector
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Fidelity Advisor Value Fund - Class M | Real Estate Sector
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Fidelity Advisor Value Fund - Class M | Industrial Sector Member
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Fidelity Advisor Value Fund - Class M | Materials Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class M | Consumer Discretionary Sector Member
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Fidelity Advisor Value Fund - Class M | Consumer Staples Sector Member
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Fidelity Advisor Value Fund - Class M | Communications Sector Member
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Fidelity Advisor Value Fund - Class M | Energy Sector
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Fidelity Advisor Value Fund - Class M | Utilities Sector Member
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Fidelity Advisor Value Fund - Class M | United States
Holdings [Line Items]
Percent of Net Asset Value	86.30%
Fidelity Advisor Value Fund - Class M | Canada
Holdings [Line Items]
Percent of Net Asset Value	6%
Fidelity Advisor Value Fund - Class M | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor Value Fund - Class M | Germany
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor Value Fund - Class M | Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class M | Belgium
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class M | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Fidelity Advisor Value Fund - Class M | India
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class M | France
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor Value Fund - Class M | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor Value Fund - Class M | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	99%
Fidelity Advisor Value Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	1%
Fidelity Advisor High Income Advantage Fund - Class Z | TH0Member
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Fidelity Advisor High Income Advantage Fund - Class Z | TH1Member
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class Z | TH2Member
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Fidelity Advisor High Income Advantage Fund - Class Z | TH3Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class Z | TH4Member
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class Z | TH5Member
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Fidelity Advisor High Income Advantage Fund - Class Z | TH6Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class Z | TH7Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class Z | TH8Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class Z | TH9Member
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Fidelity Advisor High Income Advantage Fund - Class Z | QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity Advisor High Income Advantage Fund - Class Z | QDBBMember
Holdings [Line Items]
Percent of Net Asset Value	20.70%
Fidelity Advisor High Income Advantage Fund - Class Z | QDBMember
Holdings [Line Items]
Percent of Net Asset Value	30.90%
Fidelity Advisor High Income Advantage Fund - Class Z | QDCCCCCCMember
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Fidelity Advisor High Income Advantage Fund - Class Z | QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Fidelity Advisor High Income Advantage Fund - Class Z | QDEquitiesMember
Holdings [Line Items]
Percent of Net Asset Value	22.30%
Fidelity Advisor High Income Advantage Fund - Class Z | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class Z | United States
Holdings [Line Items]
Percent of Net Asset Value	91.10%
Fidelity Advisor High Income Advantage Fund - Class Z | Canada
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Fidelity Advisor High Income Advantage Fund - Class Z | United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity Advisor High Income Advantage Fund - Class Z | Zambia
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class Z | France
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Fidelity Advisor High Income Advantage Fund - Class Z | OtherMember
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Fidelity Advisor High Income Advantage Fund - Class Z | Netherlands
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class Z | China
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Fidelity Advisor High Income Advantage Fund - Class Z | Luxembourg
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Advisor High Income Advantage Fund - Class Z | Taiwan
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Fidelity Advisor High Income Advantage Fund - Class Z | AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	20.10%
Fidelity Advisor High Income Advantage Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	11.80%
Fidelity Advisor High Income Advantage Fund - Class Z | AACorporateBondsMember
Holdings [Line Items]
Percent of Net Asset Value	51.50%
Fidelity Advisor High Income Advantage Fund - Class Z | AABankLoanObligationsMember
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Fidelity Advisor High Income Advantage Fund - Class Z | AAPreferredSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Fidelity Advisor High Income Advantage Fund - Class Z | AAAlternativeFundsMember
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Advisor High Income Advantage Fund - Class Z | AAAssetBackedSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%