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 | Pioneer Series Trust VII |
| Entity Central Index Key | 0001140157 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
Shareholder Report
| Shareholder Report | 12 Months Ended | |
| Oct. 31, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | Pioneer Series Trust VII | |
| Entity Central Index Key | 0001140157 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Oct. 31, 2024 | |
| C000239822 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer CAT Bond Fund | |
| Class Name | Class A | |
| Trading Symbol | ACBAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Pioneer CAT Bond Fund (“Fund”) for the period of 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 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 year? (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 A $ 1.70 % | |
| Expenses Paid, Amount | $ 182 | |
| Expense Ratio, Percent | 1.70% | |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected the Fund performance? For the fiscal year ended October 31, 2024, the Fund’s Class A shares at NAV returned 13.98%. For the same period, the Fund’s broad-based benchmark, the Bloomberg US Aggregate Bond Total Return Index, returned 10.55%. The performance benchmark, the ICE BofA 3-Month US Treasury Bill Total Return Index, returned 5.39% during the period. The continued elevated pricing trends associated with underwriting catastrophe risk, along with increased loss retention levels by insurance companies, helped drive the Fund’s positive performance during the period, but there were a few catastrophic events to which the Fund had exposure over the course of the reporting period. Hurricane Helene made landfall on September 26 in the “Big Bend” area of Florida, as a Category 4 event. Expected insured losses, including the National Flood Insurance Program (NFIP), are estimated to be below $15 billion. Primary insurers will retain most of the losses and impact on the event-linked bonds in which the Fund invests is expected to be very limited. Hurricane Milton made landfall on October 9 south of Tampa, Florida, as a Category 3 hurricane. Preliminary insured loss estimates, excluding NFIP, are between $25 billion and $40 billion. NFIP losses are anticipated to range from the low to mid-single billions, which means the NFIP CAT bonds will not be activated. A significant share of the insured losses is likely to be absorbed by the primary insurance companies. The catastrophe bonds held by the Fund tend to remain above these loss levels, which we believe will have a negligible impact on the Fund. As of October 31, 2024, the North Atlantic hurricane season resulted in 15 named storms 10 hurricanes and 4 major hurricanes. Many of these events did not make landfall in the U.S. For those making U.S. landfall, most of the insured losses were retained by insurance companies with de minimis impact on the reinsurance industry. As a result, the Fund's catastrophe bond investments generally were not significantly negatively affected by the North Atlantic hurricane season. | |
| Performance Past Does Not Indicate Future [Text] | The performance data quoted represents past performance, which is no guarantee of future results. | |
| Line Graph [Table Text Block] | Fund Performance The line graph below shows the change in value of a $10,000 investment made in Class A shares of the Fund at public offering price during the periods shown, compared to that of the Bloomberg US Aggregate Bond Total Return Index and the ICE BofA 3-Month US Treasury Bill Total Return Index. GROWTH OF $10,000 | |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year Since Inception * Class A (with sales charge) 8.89 % 11.48 % Class A (without sales charge) 13.98 % 14.43 % Bloomberg US Aggregate Bond Total Return Index 10.55 % 2.46 % ICE BofA 3-Month US Treasury Bill Total Return Index 5.39 % 5.28 % * Performance of Class A shares of the Fund shown in the graph above is from the inception of Class A shares on 1/27/23 through 10/31/24. Index information shown in the graph above is from 1/31/23 through 10/31/24. | |
| Performance Inception Date | Jan. 27, 2023 | |
| 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. | |
| Updated Performance Information Location [Text Block] | Call 1-800-225-6292 or visit https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Net Assets | $ 439,152,721 | |
| Holdings Count | Holding | 151 | [1] |
| Advisory Fees Paid, Amount | $ 3,235,416 | |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 151 ^^ Total advisory fee paid $ Portfolio turnover rate 25 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DIVERSIFICATION BY RISK (as of October 31, 2024 ) * Event Linked Bonds 92.1 Collateralized Reinsurance 7.9 * 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 March 3, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Summary of Change Legend [Text Block] | For more complete information, you may review the Fund's next prospectus, which we expect to be available by March 3, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| C000239824 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer CAT Bond Fund | |
| Class Name | Class K | |
| Trading Symbol | ACBKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Pioneer CAT Bond Fund (“Fund”) for the period of 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 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 year? (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 $ 1.33 % | |
| Expenses Paid, Amount | $ 143 | |
| Expense Ratio, Percent | 1.33% | |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected the Fund performance? For the fiscal year ended October 31, 2024, the Fund’s Class K shares at NAV returned 14.43%. For the same period, the Fund’s broad-based benchmark, the Bloomberg US Aggregate Bond Total Return Index, returned 10.55%. The performance benchmark, the ICE BofA 3-Month US Treasury Bill Total Return Index, returned 5.39% during the period. The continued elevated pricing trends associated with underwriting catastrophe risk, along with increased loss retention levels by insurance companies, helped drive the Fund’s positive performance during the period, but there were a few catastrophic events to which the Fund had exposure over the course of the reporting period. Hurricane Helene made landfall on September 26 in the “Big Bend” area of Florida, as a Category 4 event. Expected insured losses, including the National Flood Insurance Program (NFIP), are estimated to be below $15 billion. Primary insurers will retain most of the losses and impact on the event-linked bonds in which the Fund invests is expected to be very limited. Hurricane Milton made landfall on October 9 south of Tampa, Florida, as a Category 3 hurricane. Preliminary insured loss estimates, excluding NFIP, are between $25 billion and $40 billion. NFIP losses are anticipated to range from the low to mid-single billions, which means the NFIP CAT bonds will not be activated. A significant share of the insured losses is likely to be absorbed by the primary insurance companies. The catastrophe bonds held by the Fund tend to remain above these loss levels, which we believe will have a negligible impact on the Fund. As of October 31, 2024, the North Atlantic hurricane season resulted in 15 named storms 10 hurricanes and 4 major hurricanes. Many of these events did not make landfall in the U.S. For those making U.S. landfall, most of the insured losses were retained by insurance companies with de minimis impact on the reinsurance industry. As a result, the Fund's catastrophe bond investments generally were not significantly negatively affected by the North Atlantic hurricane season. | |
| Performance Past Does Not Indicate Future [Text] | The performance data quoted represents past performance, which is no guarantee of future results. | |
| Line Graph [Table Text Block] | Fund Performance The line graph below shows the change in value of a $5 million investment made in Class K shares of the Fund during the periods shown, compared to that of the Bloomberg US Aggregate Bond Total Return Index and the ICE BofA 3-Month US Treasury Bill Total Return Index. GROWTH OF $5 million | |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year Since Inception * Class K 14.43 % 14.86 % Bloomberg US Aggregate Bond Total Return Index 10.55 % 2.46 % ICE BofA 3-Month US Treasury Bill Total Return Index 5.39 % 5.28 % * Performance of Class K shares of the Fund shown in the graph above is from the inception of Class K shares on 1/27/23 through 10/31/24. Index information shown in the graph above is from 1/31/23 through 10/31/24. | |
| Performance Inception Date | Jan. 27, 2023 | |
| 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. | |
| Updated Performance Information Location [Text Block] | Call 1-800-225-6292 or visit https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Net Assets | $ 439,152,721 | |
| Holdings Count | Holding | 151 | [2] |
| Advisory Fees Paid, Amount | $ 3,235,416 | |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 151 ^^ Total advisory fee paid $ Portfolio turnover rate 25 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DIVERSIFICATION BY RISK (as of October 31, 2024 ) * Event Linked Bonds 92.1 Collateralized Reinsurance 7.9 * 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 March 3, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Summary of Change Legend [Text Block] | For more complete information, you may review the Fund's next prospectus, which we expect to be available by March 3, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| C000239821 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Pioneer CAT Bond Fund | |
| Class Name | Class Y | |
| Trading Symbol | CBYYX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Pioneer CAT Bond Fund (“Fund”) for the period of 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 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 year? (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 $ 1.46 % | |
| Expenses Paid, Amount | $ 156 | |
| Expense Ratio, Percent | 1.46% | |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected the Fund performance? For the fiscal year ended October 31, 2024, the Fund’s Class Y shares at NAV returned 14.27%. For the same period, the Fund’s broad-based benchmark, the Bloomberg US Aggregate Bond Total Return Index, returned 10.55%. The performance benchmark, the ICE BofA 3-Month US Treasury Bill Total Return Index, returned 5.39% during the period. The continued elevated pricing trends associated with underwriting catastrophe risk, along with increased loss retention levels by insurance companies, helped drive the Fund’s positive performance during the period, but there were a few catastrophic events to which the Fund had exposure over the course of the reporting period. Hurricane Helene made landfall on September 26 in the “Big Bend” area of Florida, as a Category 4 event. Expected insured losses, including the National Flood Insurance Program (NFIP), are estimated to be below $15 billion. Primary insurers will retain most of the losses and impact on the event-linked bonds in which the Fund invests is expected to be very limited. Hurricane Milton made landfall on October 9 south of Tampa, Florida, as a Category 3 hurricane. Preliminary insured loss estimates, excluding NFIP, are between $25 billion and $40 billion. NFIP losses are anticipated to range from the low to mid-single billions, which means the NFIP CAT bonds will not be activated. A significant share of the insured losses is likely to be absorbed by the primary insurance companies. The catastrophe bonds held by the Fund tend to remain above these loss levels, which we believe will have a negligible impact on the Fund. As of October 31, 2024, the North Atlantic hurricane season resulted in 15 named storms 10 hurricanes and 4 major hurricanes. Many of these events did not make landfall in the U.S. For those making U.S. landfall, most of the insured losses were retained by insurance companies with de minimis impact on the reinsurance industry. As a result, the Fund's catastrophe bond investments generally were not significantly negatively affected by the North Atlantic hurricane season. | |
| Performance Past Does Not Indicate Future [Text] | The performance data quoted represents past performance, which is no guarantee of future results. | |
| Line Graph [Table Text Block] | Fund Performance The line graph below shows the change in value of a $5 million investment made in Class Y shares of the Fund during the periods shown, compared to that of the Bloomberg US Aggregate Bond Total Return Index and the ICE BofA 3-Month US Treasury Bill Total Return Index. GROWTH OF $5 million | |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year Since Inception * Class Y 14.27 % 14.71 % Bloomberg US Aggregate Bond Total Return Index 10.55 % 2.46 % ICE BofA 3-Month US Treasury Bill Total Return Index 5.39 % 5.28 % * Performance of Class Y shares of the Fund shown in the graph above is from the inception of Class Y shares on 1/27/23 through 10/31/24. Index information shown in the graph above is from 1/31/23 through 10/31/24. | |
| Performance Inception Date | Jan. 27, 2023 | |
| 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. | |
| Updated Performance Information Location [Text Block] | Call 1-800-225-6292 or visit https://www.amundi.com/usinvestors/Resources/Shareholder-Reports | |
| Net Assets | $ 439,152,721 | |
| Holdings Count | Holding | 151 | [3] |
| Advisory Fees Paid, Amount | $ 3,235,416 | |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets $ % Total number of portfolio holdings 151 ^^ Total advisory fee paid $ Portfolio turnover rate 25 % ^^ Excluding short-term investments and all derivative contracts except for options purchased. | |
| Holdings [Text Block] | SECTOR DIVERSIFICATION BY RISK (as of October 31, 2024 ) * Event Linked Bonds 92.1 Collateralized Reinsurance 7.9 * 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 March 3, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Summary of Change Legend [Text Block] | For more complete information, you may review the Fund's next prospectus, which we expect to be available by March 3, 2025 at https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| Updated Prospectus Phone Number | 1-800-225-6292 | |
| Updated Prospectus Web Address | https://www.amundi.com/usinvestors/Products/Mutual-Funds | |
| [1]Excluding short-term investments and all derivative contracts except for options purchased.[2]Excluding short-term investments and all derivative contracts except for options purchased.[3]Excluding short-term investments and all derivative contracts except for options purchased. | ||
Shareholder Report, Line Graph
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 21 Months Ended | |||
| Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2023 | Jan. 27, 2023 | ||
| C000239822 [Member] | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Class A (with sales charge) | ||||
| Account Value | $ 12,105.82 | $ 12,105.82 | $ 10,620.82 | $ 9,550 | |
| Average Annual Return, Percent | 8.89% | 11.48% | [1] | ||
| C000239822 [Member] | Without Sales Load [Member] | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Class A (without sales charge) | ||||
| Average Annual Return, Percent | 13.98% | 14.43% | [1] | ||
| C000239824 [Member] | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Class K | ||||
| Account Value | $ 6,374,204.68 | $ 6,374,204.68 | 5,575,000 | 5,000,000 | |
| Average Annual Return, Percent | 14.43% | 14.86% | [2] | ||
| C000239821 [Member] | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Class Y | ||||
| Account Value | $ 6,364,647.86 | $ 6,364,647.86 | 5,570,000 | 5,000,000 | |
| Average Annual Return, Percent | 14.27% | 14.71% | [3] | ||
| Bloomberg US Aggregate Bond Total Return Index [Member] | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg US Aggregate Bond Total Return Index | ||||
| Account Value | $ 10,428.13482 | $ 10,428.13482 | 9,433.276299 | 10,000 | |
| Average Annual Return, Percent | 10.55% | 2.46% | [1],[2],[3] | ||
| ICE BofA 3 Month US Treasury Bill Total Return Index [Member] | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | ICE BofA 3-Month US Treasury Bill Total Return Index | ||||
| Account Value | $ 10,932.32394 | $ 10,932.32394 | $ 10,373.56805 | $ 10,000 | |
| Average Annual Return, Percent | 5.39% | 5.28% | [1],[2],[3] | ||
| [1]Performance of Class A shares of the Fund shown in the graph above is from the inception of Class A shares on 1/27/23 through 10/31/24. Index information shown in the graph above is from 1/31/23 through 10/31/24.[2]Performance of Class K shares of the Fund shown in the graph above is from the inception of Class K shares on 1/27/23 through 10/31/24. Index information shown in the graph above is from 1/31/23 through 10/31/24.[3]Performance of Class Y shares of the Fund shown in the graph above is from the inception of Class Y shares on 1/27/23 through 10/31/24. Index information shown in the graph above is from 1/31/23 through 10/31/24. | |||||
Shareholder Report, Holdings (D
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 | |
| C000239822 [Member] | Event Linked Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 92.10% | [1] |
| C000239822 [Member] | Collateralized Reinsurance [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.90% | [1] |
| C000239824 [Member] | Event Linked Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 92.10% | [2] |
| C000239824 [Member] | Collateralized Reinsurance [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.90% | [2] |
| C000239821 [Member] | Event Linked Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 92.10% | [3] |
| C000239821 [Member] | Collateralized Reinsurance [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.90% | [3] |
| [1]As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased.[2]As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased.[3]As a percentage of total investments excluding short-term investments and all derivative contracts except for options purchased. | ||