| Form N-CSR Cover | 6 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Pioneer Series Trust X |
| Entity Central Index Key | 0001174520 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Sep. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Pioneer Series Trust X | |
| Entity Central Index Key | 0001174520 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Sep. 30, 2024 | |
| Pioneer Fundamental Growth Fund - Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Fundamental Growth Fund | |
| Class Name | Class A | |
| Trading Symbol | PIGFX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Fundamental Growth Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund c (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $1 0 Class A $ 1.00 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 52 | |
| Expense Ratio, Percent | 1% | [1] |
| Net Assets | $ 7,751,416,736 | |
| Holdings Count | Holding | 40 | [2] |
| Investment Company, Portfolio Turnover | 9% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 40 ^^ Portfolio turnover rate 9 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DISTRIBUTION * Information Technology 39.2 % Consumer Discretionary 17.1 % Health Care 12.6 % Financials 12.2 % Industrials 8.3 % Communication Services 5.4 % Consumer Staples 3.5 % Energy 1.7 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fun d’ s indirect The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. ard, the proposal to reorganize the Fund will be submitted to the shareholders of the Fund For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fun d’ s indirect The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. ard, the proposal to reorganize the Fund will be submitted to the shareholders of the Fund | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Fundamental Growth Fund - Class C | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Fundamental Growth Fund | |
| Class Name | Class C | |
| Trading Symbol | FUNCX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Fundamental Growth Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage Class C $ 1.72 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 89 | |
| Expense Ratio, Percent | 1.72% | [1] |
| Net Assets | $ 7,751,416,736 | |
| Holdings Count | Holding | 40 | [2] |
| Investment Company, Portfolio Turnover | 9% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 40 ^^ Portfolio turnover rate 9 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DISTRIBUTION * Information Technology 39.2 % Consumer Discretionary 17.1 % Health Care 12.6 % Financials 12.2 % Industrials 8.3 % Communication Services 5.4 % Consumer Staples 3.5 % Energy 1.7 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Fundamental Growth Fund -Class K | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Fundamental Growth Fund | |
| Class Name | Class K | |
| Trading Symbol | PFGKX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Fundamental Growth Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class K $ 0.65 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 34 | |
| Expense Ratio, Percent | 0.65% | [1] |
| Net Assets | $ 7,751,416,736 | |
| Holdings Count | Holding | 40 | [2] |
| Investment Company, Portfolio Turnover | 9% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 40 ^^ Portfolio turnover rate 9 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DISTRIBUTION * Information Technology 39.2 % Consumer Discretionary 17.1 % Health Care 12.6 % Financials 12.2 % Industrials 8.3 % Communication Services 5.4 % Consumer Staples 3.5 % Energy 1.7 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. the closing For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. the closing | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Fundamental Growth Fund- Class R | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Fundamental Growth Fund | |
| Class Name | Class R | |
| Trading Symbol | PFGRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Fundamental Growth Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R $ 1.39 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 72 | |
| Expense Ratio, Percent | 1.39% | [1] |
| Net Assets | $ 7,751,416,736 | |
| Holdings Count | Holding | 40 | [2] |
| Investment Company, Portfolio Turnover | 9% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 40 ^^ Portfolio turnover rate 9 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DISTRIBUTION * Information Technology 39.2 % Consumer Discretionary 17.1 % Health Care 12.6 % Financials 12.2 % Industrials 8.3 % Communication Services 5.4 % Consumer Staples 3.5 % Energy 1.7 % * As a percentage derivative | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. Transaction The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. Transaction The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Fundamental Growth Fund -Class Y | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Fundamental Growth Fund | |
| Class Name | Class Y | |
| Trading Symbol | FUNYX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Fundamental Growth Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage Class Y $ 0.76 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 39 | |
| Expense Ratio, Percent | 0.76% | [1] |
| Net Assets | $ 7,751,416,736 | |
| Holdings Count | Holding | 40 | [2] |
| Investment Company, Portfolio Turnover | 9% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 40 ^^ Portfolio turnover rate 9 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DISTRIBUTION * Information Technology 39.2 % Consumer Discretionary 17.1 % Health Care 12.6 % Financials 12.2 % Industrials 8.3 % Communication Services 5.4 % Consumer Staples 3.5 % Energy 1.7 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Multi-Asset Ultrashort Income Fund | |
| Class Name | Class A | |
| Trading Symbol | MAFRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Multi-Asset Ultrashort Income Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs Class A $ 0.59 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 30 | |
| Expense Ratio, Percent | 0.59% | [1] |
| Net Assets | $ 6,285,683,481 | |
| Holdings Count | Holding | 1,059 | [2] |
| Investment Company, Portfolio Turnover | 31% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 1,059 ^^ Portfolio turnover rate 31 % ^^ Excluding short-term investments and all derivative contracts | |
| Holdings [Text Block] | PORTFOLIO DIVERSIFICATION * Corporate Bonds 35.1 % Asset Backed Securities 32.3 % Collateralized Mortgage Obligations 11.7 % Commercial Mortgage-Backed Securities 9.1 % U.S. Government and Agency Obligations 8.4 % Senior Secured Floating Rate Loan Interests 2.3 % Insurance-Linked Securities 1.1 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. strategic The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. strategic The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Multi-Asset Ultrashort Income Fund | |
| Class Name | Class C | |
| Trading Symbol | MCFRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Multi-Asset Ultrashort Income Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 0.90 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 46 | |
| Expense Ratio, Percent | 0.90% | [1] |
| Net Assets | $ 6,285,683,481 | |
| Holdings Count | Holding | 1,059 | [2] |
| Investment Company, Portfolio Turnover | 31% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 1,059 ^^ Portfolio turnover rate 31 % ^^ Excluding short-term investments and erivati | |
| Holdings [Text Block] | PORTFOLIO DIVERSIFICATION * Corporate Bonds 35.1 % Asset Backed Securities 32.3 % Collateralized Mortgage Obligations 11.7 % Commercial Mortgage-Backed Securities 9.1 % U.S. Government and Agency Obligations 8.4 % Senior Secured Floating Rate Loan Interests 2.3 % Insurance-Linked Securities 1.1 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Multi-Asset Ultrashort Income Fund | |
| Class Name | Class C2 | |
| Trading Symbol | MAUCX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Multi-Asset Ultrashort Income Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C2 $ 0.88 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 45 | |
| Expense Ratio, Percent | 0.88% | [1] |
| Net Assets | $ 6,285,683,481 | |
| Holdings Count | Holding | 1,059 | [2] |
| Investment Company, Portfolio Turnover | 31% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 1,059 ^^ Portfolio turnover rate 31 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | PORTFOLIO DIVERSIFICATION * Corporate Bonds 35.1 % Asset Backed Securities 32.3 % Collateralized Mortgage Obligations 11.7 % Commercial Mortgage-Backed Securities 9.1 % U.S. Government and Agency Obligations 8.4 % Senior Secured Floating Rate Loan Interests 2.3 % Insurance-Linked Securities 1.1 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Multi-Asset Ultrashort Income Fund | |
| Class Name | Class K | |
| Trading Symbol | MAUKX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Multi-Asset Ultrashort Income Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class K $ 0.36 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 18 | |
| Expense Ratio, Percent | 0.36% | [1] |
| Net Assets | $ 6,285,683,481 | |
| Holdings Count | Holding | 1,059 | [2] |
| Investment Company, Portfolio Turnover | 31% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 1,059 ^^ Portfolio turnover rate 31 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | PORTFOLIO DIVERSIFICATION * Corporate Bonds 35.1 % Asset Backed Securities 32.3 % Collateralized Mortgage Obligations 11.7 % Commercial Mortgage-Backed Securities 9.1 % U.S. Government and Agency Obligations 8.4 % Senior Secured Floating Rate Loan Interests 2.3 % Insurance-Linked Securities 1.1 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer Multi-Asset Ultrashort Income Fund | |
| Class Name | Class Y | |
| Trading Symbol | MYFRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Pioneer Multi-Asset Ultrashort Income Fund (“Fund”) for | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-225-6292 | |
| Additional Information Website | https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Y $ 0.44 % ^ ^ Annualized | |
| Expenses Paid, Amount | $ 22 | |
| Expense Ratio, Percent | 0.44% | [1] |
| Net Assets | $ 6,285,683,481 | |
| Holdings Count | Holding | 1,059 | [2] |
| Investment Company, Portfolio Turnover | 31% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 1,059 ^^ Portfolio turnover rate 31 % ^^ Excluding short- term | |
| Holdings [Text Block] | PORTFOLIO DIVERSIFICATION * Corporate Bonds 35.1 % Asset Backed Securities 32.3 % Collateralized Mortgage Obligations 11.7 % Commercial Mortgage-Backed Securities 9.1 % U.S. Government and Agency Obligations 8.4 % Senior Secured Floating Rate Loan Interests 2.3 % Insurance-Linked Securities 1.1 % * As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | |
| Material Fund Change [Text Block] | Material Fund Changes Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. For more complete information, you may review the Fund's next prospectus, which we expect to be available by August 1, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Material Fund Change Adviser [Text Block] | Amundi Asset Management US, Inc. (the “Adviser”), the Fund’s investment adviser, is currently an indirect, wholly-owned subsidiary of Amundi. The closing of the Transaction would cause the Fund’s current investment advisory agreement with the Adviser to terminate. | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| [1]Annualized[2]Excluding short-term investments and all derivative contracts except for options purchased. | ||
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 | [1] |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 35.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.70% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | Commercial MortgageBacked Security [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | U.S. Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.40% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | Senior Secured Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS Y [Member] | Insurance-Linked Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 35.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.70% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | Commercial MortgageBacked Security [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | U.S. Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.40% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | Senior Secured Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS K [Member] | Insurance-Linked Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 35.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.70% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | Commercial MortgageBacked Security [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | U.S. Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.40% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | Senior Secured Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C2 [Member] | Insurance-Linked Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 35.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.70% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | Commercial MortgageBacked Security [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | U.S. Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.40% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | Senior Secured Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS C [Member] | Insurance-Linked Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 35.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.70% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | Commercial MortgageBacked Security [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.10% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | U.S. Government and Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.40% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | Senior Secured Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.30% | |
| Pioneer Multi-Asset Ultrashort Income Fund - CLASS A | Insurance-Linked Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | |
| Pioneer Fundamental Growth Fund -Class Y | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 39.20% | |
| Pioneer Fundamental Growth Fund -Class Y | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.10% | |
| Pioneer Fundamental Growth Fund -Class Y | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.60% | |
| Pioneer Fundamental Growth Fund -Class Y | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.20% | |
| Pioneer Fundamental Growth Fund -Class Y | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.30% | |
| Pioneer Fundamental Growth Fund -Class Y | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.40% | |
| Pioneer Fundamental Growth Fund -Class Y | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.50% | |
| Pioneer Fundamental Growth Fund -Class Y | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.70% | |
| Pioneer Fundamental Growth Fund- Class R | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 39.20% | |
| Pioneer Fundamental Growth Fund- Class R | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.10% | |
| Pioneer Fundamental Growth Fund- Class R | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.60% | |
| Pioneer Fundamental Growth Fund- Class R | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.20% | |
| Pioneer Fundamental Growth Fund- Class R | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.30% | |
| Pioneer Fundamental Growth Fund- Class R | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.40% | |
| Pioneer Fundamental Growth Fund- Class R | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.50% | |
| Pioneer Fundamental Growth Fund- Class R | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.70% | |
| Pioneer Fundamental Growth Fund -Class K | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 39.20% | |
| Pioneer Fundamental Growth Fund -Class K | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.10% | |
| Pioneer Fundamental Growth Fund -Class K | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.60% | |
| Pioneer Fundamental Growth Fund -Class K | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.20% | |
| Pioneer Fundamental Growth Fund -Class K | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.30% | |
| Pioneer Fundamental Growth Fund -Class K | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.40% | |
| Pioneer Fundamental Growth Fund -Class K | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.50% | |
| Pioneer Fundamental Growth Fund -Class K | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.70% | |
| Pioneer Fundamental Growth Fund - Class C | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 39.20% | |
| Pioneer Fundamental Growth Fund - Class C | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.10% | |
| Pioneer Fundamental Growth Fund - Class C | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.60% | |
| Pioneer Fundamental Growth Fund - Class C | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.20% | |
| Pioneer Fundamental Growth Fund - Class C | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.30% | |
| Pioneer Fundamental Growth Fund - Class C | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.40% | |
| Pioneer Fundamental Growth Fund - Class C | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.50% | |
| Pioneer Fundamental Growth Fund - Class C | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.70% | |
| Pioneer Fundamental Growth Fund - Class A | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 39.20% | |
| Pioneer Fundamental Growth Fund - Class A | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.10% | |
| Pioneer Fundamental Growth Fund - Class A | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.60% | |
| Pioneer Fundamental Growth Fund - Class A | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.20% | |
| Pioneer Fundamental Growth Fund - Class A | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.30% | |
| Pioneer Fundamental Growth Fund - Class A | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.40% | |
| Pioneer Fundamental Growth Fund - Class A | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.50% | |
| Pioneer Fundamental Growth Fund - Class A | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.70% | |
| [1]As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | ||
