v3.26.1
Shareholder Report
12 Months Ended
May 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name First Trust Exchange-Traded Fund VIII
Entity Central Index Key 0001667919
Entity Investment Company Type N-1A
Document Period End Date May 31, 2026
C000248655 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - March
Class Name FT Vest U.S. Equity Max Buffer ETF - March
Trading Symbol MARM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - March (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/MARM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/MARM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - March $89 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.86% [1]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 7.37% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 2.48 %
Changes in other Variables 5.75 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (March 26, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(3/26/24)
FT Vest U.S. Equity Max Buffer ETF - March 7.37% 7.63%
S&P 500® Index 29.78% 20.36%
Performance Inception Date Mar. 26, 2024
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]
Visit www.ftportfolios.com/etf/MARM for more recent performance information.
Net Assets $ 107,419,036
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 1,044,585
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $107,419,036
Total number of portfolio holdings 5
Total advisory fee paid $1,044,585
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.0%
Purchased Options 114.5%
Written Options (15.4%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/MARM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/MARM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/MARM
C000250280 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Equal Weight Buffer ETF - June
Class Name FT Vest U.S. Equity Equal Weight Buffer ETF - June
Trading Symbol RSJN
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Equal Weight Buffer ETF - June (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RSJN. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/RSJN
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Equal Weight Buffer ETF - June $92 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.86% [2]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 14.60% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Equal Weight Index, which returned 20.43% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 11.91 %
Changes in other Variables 3.55 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (June 21, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(6/21/24)
FT Vest U.S. Equity Equal Weight Buffer ETF - June 14.60% 10.61%
S&P 500® Equal Weight Index 20.43% 14.81%
S&P 500® Index 29.78% 19.85%
Performance Inception Date Jun. 21, 2024
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]
Visit www.ftportfolios.com/etf/RSJN for more recent performance information.
Net Assets $ 18,328,858
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 199,980
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $18,328,858
Total number of portfolio holdings 5
Total advisory fee paid $199,980
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.4%
Purchased Options 102.1%
Written Options (2.4%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSJN or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSJN or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/RSJN
C000250354 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - June
Class Name FT Vest U.S. Equity Max Buffer ETF - June
Trading Symbol JUNM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - June (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/JUNM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/JUNM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - June $89 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.86% [3]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.02% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 3.14 %
Changes in other Variables 5.74 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (June 21, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(6/21/24)
FT Vest U.S. Equity Max Buffer ETF - June 8.02% 7.36%
S&P 500® Index 29.78% 19.85%
Performance Inception Date Jun. 21, 2024
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]
Visit www.ftportfolios.com/etf/JUNM for more recent performance information.
Net Assets $ 62,993,406
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 547,839
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $62,993,406
Total number of portfolio holdings 5
Total advisory fee paid $547,839
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.3%
Purchased Options 118.9%
Written Options (19.1%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/JUNM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/JUNM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/JUNM
C000251231 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - July
Class Name FT Vest U.S. Equity Max Buffer ETF - July
Trading Symbol JULM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - July (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/JULM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/JULM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - July $89 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.86% [4]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 7.72% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 4.34 %
Changes in other Variables 4.24 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (July 24, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(7/24/24)
FT Vest U.S. Equity Max Buffer ETF - July 7.72% 7.19%
S&P 500® Index 29.78% 21.31%
Performance Inception Date Jul. 24, 2024
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]
Visit www.ftportfolios.com/etf/JULM for more recent performance information.
Net Assets $ 24,992,949
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 220,366
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $24,992,949
Total number of portfolio holdings 5
Total advisory fee paid $220,366
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.4%
Purchased Options 113.1%
Written Options (13.4%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/JULM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/JULM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/JULM
C000252052 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - August
Class Name FT Vest U.S. Equity Max Buffer ETF - August
Trading Symbol AUGM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - August (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/AUGM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/AUGM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - August $88 0.85%
Expenses Paid, Amount $ 88
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.00% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 4.84 %
Changes in other Variables 4.01 %
Fees and Expenses -0.85 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (August 16, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(8/16/24)
FT Vest U.S. Equity Max Buffer ETF - August 8.00% 6.86%
S&P 500® Index 29.78% 20.49%
Performance Inception Date Aug. 16, 2024
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]
Visit www.ftportfolios.com/etf/AUGM for more recent performance information.
Net Assets $ 32,330,442
Holdings Count | Holding 4
Advisory Fees Paid, Amount $ 264,923
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $32,330,442
Total number of portfolio holdings 4
Total advisory fee paid $264,923
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Purchased Options 111.1%
Written Options (11.6%)
Net Other Assets and Liabilities 0.5%
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/AUGM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/AUGM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/AUGM
C000252053 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - September
Class Name FT Vest U.S. Equity Max Buffer ETF - September
Trading Symbol SEPM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - September (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/SEPM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/SEPM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - September $89 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.86% [5]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.05% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 5.42 %
Changes in other Variables 3.49 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (September 20, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(9/20/24)
FT Vest U.S. Equity Max Buffer ETF - September 8.05% 6.28%
S&P 500® Index 29.78% 19.79%
Performance Inception Date Sep. 20, 2024
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]
Visit www.ftportfolios.com/etf/SEPM for more recent performance information.
Net Assets $ 31,124,722
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 236,728
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $31,124,722
Total number of portfolio holdings 5
Total advisory fee paid $236,728
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.6%
Purchased Options 108.6%
Written Options (9.1%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/SEPM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/SEPM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/SEPM
C000252245 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Emerging Markets Buffer ETF - December
Class Name FT Vest Emerging Markets Buffer ETF - December
Trading Symbol TDEC
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Emerging Markets Buffer ETF - December (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/TDEC. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/TDEC
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Emerging Markets Buffer ETF - December $109 0.97%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.95%.
Expenses Paid, Amount $ 109
Expense Ratio, Percent 0.97% [6]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.95%.
Expenses Excluding Extraordinary Expenses, Percent 0.95%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 24.29% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 54.31% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 22.15 %
Changes in other Variables 3.11 %
Fees and Expenses -0.97 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (December 20, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(12/20/24)
FT Vest Emerging Markets Buffer ETF - December 24.29% 20.61%
MSCI Emerging Markets Index 54.31% 43.46%
Performance Inception Date Dec. 20, 2024
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]
Visit www.ftportfolios.com/etf/TDEC for more recent performance information.
Net Assets $ 10,460,324
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 65,595
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $10,460,324
Total number of portfolio holdings 5
Total advisory fee paid $65,595
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.9%
Purchased Options 116.2%
Written Options (17.0%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/TDEC or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/TDEC or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/TDEC
C000252246 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Emerging Markets Buffer ETF - March
Class Name FT Vest Emerging Markets Buffer ETF - March
Trading Symbol TMAR
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Emerging Markets Buffer ETF - March (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/TMAR. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/TMAR
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Emerging Markets Buffer ETF - March $110 0.96%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.95%.
Expenses Paid, Amount $ 110
Expense Ratio, Percent 0.96% [7]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.95%.
Expenses Excluding Extraordinary Expenses, Percent 0.95%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 29.74% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 54.31% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 19.89 %
Changes in other Variables 10.81 %
Fees and Expenses -0.96 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (March 21, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(3/21/25)
FT Vest Emerging Markets Buffer ETF - March 29.74% 24.72%
MSCI Emerging Markets Index 54.31% 47.28%
Performance Inception Date Mar. 21, 2025
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]
Visit www.ftportfolios.com/etf/TMAR for more recent performance information.
Net Assets $ 7,798,885
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 35,055
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $7,798,885
Total number of portfolio holdings 5
Total advisory fee paid $35,055
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.1%
Purchased Options 111.6%
Written Options (12.6%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/TMAR or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/TMAR or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/TMAR
C000252247 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Emerging Markets Buffer ETF - September
Class Name FT Vest Emerging Markets Buffer ETF - September
Trading Symbol TSEP
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Emerging Markets Buffer ETF - September (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/TSEP. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/TSEP
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Emerging Markets Buffer ETF - September $107 0.95%
Expenses Paid, Amount $ 107
Expense Ratio, Percent 0.95%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 24.63% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 54.31% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 27.43 %
Changes in other Variables -1.85 %
Fees and Expenses -0.95 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (September 20, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(9/20/24)
FT Vest Emerging Markets Buffer ETF - September 24.63% 16.35%
MSCI Emerging Markets Index 54.31% 33.65%
Performance Inception Date Sep. 20, 2024
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]
Visit www.ftportfolios.com/etf/TSEP for more recent performance information.
Net Assets $ 16,807,752
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 92,151
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $16,807,752
Total number of portfolio holdings 5
Total advisory fee paid $92,151
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.7%
Purchased Options 115.4%
Written Options (16.0%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/TSEP or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/TSEP or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/TSEP
C000252364 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Uncapped Accelerator ETF - January
Class Name FT Vest U.S. Equity Uncapped Accelerator ETF - January
Trading Symbol UXJA
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Uncapped Accelerator ETF - January (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/UXJA. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/UXJA
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Uncapped Accelerator ETF - January $100 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 100
Expense Ratio, Percent 0.86% [8]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 31.64% for the twelve months ended May 31, 2026. The Fund outperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This outperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 34.50 %
Changes in other Variables -2.00 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (January 17, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(1/17/25)
FT Vest U.S. Equity Uncapped Accelerator ETF - January 31.64% 20.44%
S&P 500® Index 29.78% 20.18%
Performance Inception Date Jan. 17, 2025
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]
Visit www.ftportfolios.com/etf/UXJA for more recent performance information.
Net Assets $ 13,486,276
Holdings Count | Holding 4
Advisory Fees Paid, Amount $ 54,129
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $13,486,276
Total number of portfolio holdings 4
Total advisory fee paid $54,129
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.9%
Purchased Options 110.8%
Written Options (12.6%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/UXJA or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside rate of return on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/UXJA or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/UXJA
C000252365 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Uncapped Accelerator ETF - April
Class Name FT Vest U.S. Equity Uncapped Accelerator ETF - April
Trading Symbol UXAP
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Uncapped Accelerator ETF - April (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/UXAP. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/UXAP
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Uncapped Accelerator ETF - April $99 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 99
Expense Ratio, Percent 0.86% [9]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 31.24% for the twelve months ended May 31, 2026. The Fund outperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This outperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 34.27 %
Changes in other Variables -2.17 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (April 17, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(4/17/25)
FT Vest U.S. Equity Uncapped Accelerator ETF - April 31.24% 41.57%
S&P 500® Index 29.78% 39.71%
Performance Inception Date Apr. 17, 2025
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]
Visit www.ftportfolios.com/etf/UXAP for more recent performance information.
Net Assets $ 8,704,083
Holdings Count | Holding 4
Advisory Fees Paid, Amount $ 69,558
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $8,704,083
Total number of portfolio holdings 4
Total advisory fee paid $69,558
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 2.6%
Purchased Options 109.8%
Written Options (12.3%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/UXAP or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside rate of return on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/UXAP or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/UXAP
C000252366 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Uncapped Accelerator ETF - October
Class Name FT Vest U.S. Equity Uncapped Accelerator ETF - October
Trading Symbol UXOC
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Uncapped Accelerator ETF - October (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/UXOC. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/UXOC
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Uncapped Accelerator ETF - October $98 0.85%
Expenses Paid, Amount $ 98
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 30.96% for the twelve months ended May 31, 2026. The Fund outperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This outperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 33.72 %
Changes in other Variables -1.91 %
Fees and Expenses -0.85 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (October 18, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(10/18/24)
FT Vest U.S. Equity Uncapped Accelerator ETF - October 30.96% 17.99%
S&P 500® Index 29.78% 18.68%
Performance Inception Date Oct. 18, 2024
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]
Visit www.ftportfolios.com/etf/UXOC for more recent performance information.
Net Assets $ 21,844,927
Holdings Count | Holding 4
Advisory Fees Paid, Amount $ 273,311
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $21,844,927
Total number of portfolio holdings 4
Total advisory fee paid $273,311
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.6%
Purchased Options 112.5%
Written Options (14.0%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/UXOC or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside rate of return on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/UXOC or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/UXOC
C000252370 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Equal Weight Buffer ETF - December
Class Name FT Vest U.S. Equity Equal Weight Buffer ETF - December
Trading Symbol RSDE
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Equal Weight Buffer ETF - December (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RSDE. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/RSDE
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Equal Weight Buffer ETF - December $91 0.85%
Expenses Paid, Amount $ 91
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 13.90% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Equal Weight Index, which returned 20.43% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 13.66 %
Changes in other Variables 1.09 %
Fees and Expenses -0.85 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (December 20, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(12/20/24)
FT Vest U.S. Equity Equal Weight Buffer ETF - December 13.90% 10.00%
S&P 500® Equal Weight Index 20.43% 14.43%
S&P 500® Index 29.78% 20.00%
Performance Inception Date Dec. 20, 2024
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]
Visit www.ftportfolios.com/etf/RSDE for more recent performance information.
Net Assets $ 67,012,992
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 357,640
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $67,012,992
Total number of portfolio holdings 5
Total advisory fee paid $357,640
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.9%
Purchased Options 102.9%
Written Options (3.7%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSDE or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSDE or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/RSDE
C000252371 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Equal Weight Buffer ETF - March
Class Name FT Vest U.S. Equity Equal Weight Buffer ETF - March
Trading Symbol RSMR
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Equal Weight Buffer ETF - March (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RSMR. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/RSMR
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Equal Weight Buffer ETF - March $92 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.86% [10]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 14.73% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Equal Weight Index, which returned 20.43% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 10.63 %
Changes in other Variables 4.96 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (March 21, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(3/21/25)
FT Vest U.S. Equity Equal Weight Buffer ETF - March 14.73% 13.08%
S&P 500® Equal Weight Index 20.43% 18.86%
S&P 500® Index 29.78% 29.11%
Performance Inception Date Mar. 21, 2025
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]
Visit www.ftportfolios.com/etf/RSMR for more recent performance information.
Net Assets $ 10,510,815
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 62,622
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $10,510,815
Total number of portfolio holdings 5
Total advisory fee paid $62,622
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.9%
Purchased Options 103.8%
Written Options (4.7%)
Net Other Assets and Liabilities (0.0%)
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSMR or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSMR or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/RSMR
C000252372 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Equal Weight Buffer ETF - September
Class Name FT Vest U.S. Equity Equal Weight Buffer ETF - September
Trading Symbol RSSE
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Equal Weight Buffer ETF - September (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RSSE. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/RSSE
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Equal Weight Buffer ETF - September $92 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.86% [11]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 14.00% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Equal Weight Index, which returned 20.43% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 13.54 %
Changes in other Variables 1.32 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (September 20, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(9/20/24)
FT Vest U.S. Equity Equal Weight Buffer ETF - September 14.00% 8.46%
S&P 500® Equal Weight Index 20.43% 12.17%
S&P 500® Index 29.78% 19.79%
Performance Inception Date Sep. 20, 2024
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]
Visit www.ftportfolios.com/etf/RSSE for more recent performance information.
Net Assets $ 37,620,610
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 253,956
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $37,620,610
Total number of portfolio holdings 5
Total advisory fee paid $253,956
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.6%
Purchased Options 101.8%
Written Options (2.3%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSSE or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/RSSE or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/RSSE
C000254273 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - April
Class Name FT Vest U.S. Equity Max Buffer ETF - April
Trading Symbol APXM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - April (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/APXM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/APXM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - April $88 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 88
Expense Ratio, Percent 0.86% [12]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 5.63% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 1.77 %
Changes in other Variables 4.72 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (April 17, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(4/17/25)
FT Vest U.S. Equity Max Buffer ETF - April 5.63% 6.66%
S&P 500® Index 29.78% 39.71%
Performance Inception Date Apr. 17, 2025
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]
Visit www.ftportfolios.com/etf/APXM for more recent performance information.
Net Assets $ 18,223,115
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 67,197
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $18,223,115
Total number of portfolio holdings 5
Total advisory fee paid $67,197
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Money Market Funds 1.2%
Purchased Options 107.4%
Written Options (8.5%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/APXM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/APXM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/APXM
C000254274 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - December
Class Name FT Vest U.S. Equity Max Buffer ETF - December
Trading Symbol DECM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - December (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DECM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DECM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - December $90 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 90
Expense Ratio, Percent 0.86% [13]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.30% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 5.16 %
Changes in other Variables 4.00 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (December 20, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(12/20/24)
FT Vest U.S. Equity Max Buffer ETF - December 8.30% 6.53%
S&P 500® Index 29.78% 20.00%
Performance Inception Date Dec. 20, 2024
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]
Visit www.ftportfolios.com/etf/DECM for more recent performance information.
Net Assets $ 53,895,820
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 368,399
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $53,895,820
Total number of portfolio holdings 5
Total advisory fee paid $368,399
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.8%
Purchased Options 108.4%
Written Options (9.1%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/DECM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/DECM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/DECM
C000254275 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - February
Class Name FT Vest U.S. Equity Max Buffer ETF - February
Trading Symbol FEBM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - February (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FEBM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FEBM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - February $89 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.86% [14]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 7.88% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 4.51 %
Changes in other Variables 4.23 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (February 21, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(2/21/25)
FT Vest U.S. Equity Max Buffer ETF - February 7.88% 6.53%
S&P 500® Index 29.78% 21.48%
Performance Inception Date Feb. 21, 2025
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]
Visit www.ftportfolios.com/etf/FEBM for more recent performance information.
Net Assets $ 47,597,851
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 434,162
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $47,597,851
Total number of portfolio holdings 5
Total advisory fee paid $434,162
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.0%
Purchased Options 108.8%
Written Options (9.7%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FEBM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FEBM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/FEBM
C000254276 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - January
Class Name FT Vest U.S. Equity Max Buffer ETF - January
Trading Symbol JANM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - January (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/JANM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/JANM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - January $89 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.86% [15]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.08% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 5.12 %
Changes in other Variables 3.82 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (January 17, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(1/17/25)
FT Vest U.S. Equity Max Buffer ETF - January 8.08% 6.42%
S&P 500® Index 29.78% 20.18%
Performance Inception Date Jan. 17, 2025
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]
Visit www.ftportfolios.com/etf/JANM for more recent performance information.
Net Assets $ 36,369,930
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 279,627
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $36,369,930
Total number of portfolio holdings 5
Total advisory fee paid $279,627
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.9%
Purchased Options 107.8%
Written Options (8.6%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/JANM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/JANM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/JANM
C000254277 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - May
Class Name FT Vest U.S. Equity Max Buffer ETF - May
Trading Symbol MAYM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - May (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/MAYM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/MAYM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - May $89 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.86% [16]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 6.60% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 3.41 %
Changes in other Variables 4.05 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (May 16, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(5/16/25)
FT Vest U.S. Equity Max Buffer ETF - May 6.60% 6.36%
S&P 500® Index 29.78% 27.54%
Performance Inception Date May 16, 2025
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]
Visit www.ftportfolios.com/etf/MAYM for more recent performance information.
Net Assets $ 35,417,087
Holdings Count | Holding 4
Advisory Fees Paid, Amount $ 160,579
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $35,417,087
Total number of portfolio holdings 4
Total advisory fee paid $160,579
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.3%
Purchased Options 105.0%
Written Options (6.2%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/MAYM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/MAYM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/MAYM
C000254278 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - November
Class Name FT Vest U.S. Equity Max Buffer ETF - November
Trading Symbol NOVM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - November (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/NOVM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/NOVM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - November $90 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 90
Expense Ratio, Percent 0.86% [17]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.69% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 4.83 %
Changes in other Variables 4.72 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (November 15, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(11/15/24)
FT Vest U.S. Equity Max Buffer ETF - November 8.69% 6.70%
S&P 500® Index 29.78% 19.55%
Performance Inception Date Nov. 15, 2024
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]
Visit www.ftportfolios.com/etf/NOVM for more recent performance information.
Net Assets $ 27,771,668
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 201,699
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $27,771,668
Total number of portfolio holdings 5
Total advisory fee paid $201,699
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.7%
Purchased Options 110.8%
Written Options (11.4%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/NOVM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/NOVM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/NOVM
C000254279 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Max Buffer ETF - October
Class Name FT Vest U.S. Equity Max Buffer ETF - October
Trading Symbol OCTM
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Max Buffer ETF - October (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/OCTM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/OCTM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Max Buffer ETF - October $90 0.86%(1)
(1)
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Paid, Amount $ 90
Expense Ratio, Percent 0.86% [18]
Extraordinary Expenses Footnote [Text Block] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
Expenses Excluding Extraordinary Expenses, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.60% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 5.63 %
Changes in other Variables 3.83 %
Fees and Expenses -0.86 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (October 18, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(10/18/24)
FT Vest U.S. Equity Max Buffer ETF - October 8.60% 6.35%
S&P 500® Index 29.78% 18.68%
Performance Inception Date Oct. 18, 2024
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]
Visit www.ftportfolios.com/etf/OCTM for more recent performance information.
Net Assets $ 31,899,424
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 246,190
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $31,899,424
Total number of portfolio holdings 5
Total advisory fee paid $246,190
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.6%
Purchased Options 109.3%
Written Options (9.8%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/OCTM or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of the new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/OCTM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/OCTM
C000254587 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Quarterly Dynamic Buffer ETF
Class Name FT Vest U.S. Equity Quarterly Dynamic Buffer ETF
Trading Symbol FHDG
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Quarterly Dynamic Buffer ETF (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FHDG. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FHDG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Quarterly Dynamic Buffer ETF $92 0.85%
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 16.72% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 10.71 %
Changes in other Variables 6.86 %
Fees and Expenses -0.85 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (November 15, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(11/15/24)
FT Vest U.S. Equity Quarterly Dynamic Buffer ETF 16.72% 11.93%
S&P 500® Index 29.78% 19.55%
Performance Inception Date Nov. 15, 2024
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]
Visit www.ftportfolios.com/etf/FHDG for more recent performance information.
Net Assets $ 65,218,943
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 562,387
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $65,218,943
Total number of portfolio holdings 5
Total advisory fee paid $562,387
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.1%
Purchased Options 101.6%
Written Options (2.6%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FHDG or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of each new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FHDG or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/FHDG
C000254589 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF
Class Name FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF
Trading Symbol DHDG
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DHDG. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DHDG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF $92 0.85%
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 15.45% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 11.69 %
Changes in other Variables 4.61 %
Fees and Expenses -0.85 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (October 18, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(10/18/24)
FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF 15.45% 11.79%
S&P 500® Index 29.78% 18.68%
Performance Inception Date Oct. 18, 2024
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]
Visit www.ftportfolios.com/etf/DHDG for more recent performance information.
Net Assets $ 143,763,141
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 505,380
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $143,763,141
Total number of portfolio holdings 5
Total advisory fee paid $505,380
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.0%
Purchased Options 102.9%
Written Options (3.8%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/DHDG or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of each new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/DHDG or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/DHDG
C000255841 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Quarterly Max Buffer ETF
Class Name FT Vest U.S. Equity Quarterly Max Buffer ETF
Trading Symbol SQMX
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Quarterly Max Buffer ETF (the “Fund”) for the year of June 1, 2025 to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/SQMX. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during or after the reporting period.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/SQMX
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Quarterly Max Buffer ETF $89 0.85%
Expenses Paid, Amount $ 89
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.78% for the twelve months ended May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 29.78% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 6.01 %
Changes in other Variables 3.62 %
Fees and Expenses -0.85 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (December 20, 2024 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) 1 Year Since
Inception
(12/20/24)
FT Vest U.S. Equity Quarterly Max Buffer ETF 8.78% 7.38%
S&P 500® Index 29.78% 20.00%
Performance Inception Date Dec. 20, 2024
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]
Visit www.ftportfolios.com/etf/SQMX for more recent performance information.
Net Assets $ 45,144,109
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 185,840
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $45,144,109
Total number of portfolio holdings 5
Total advisory fee paid $185,840
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.0%
Purchased Options 112.4%
Written Options (13.3%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/SQMX or upon request at 1-800-621-1675 or info@ftportfolios.com.
During the fiscal year ended May 31, 2026, the Fund’s predetermined upside cap and downside buffer on Underlying ETF returns was reset based upon prevailing market conditions at the start of each new Target Outcome Period.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since June 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/SQMX or upon request at 1-800-621-1675 or info@ftportfolios.com.
Updated Prospectus Phone Number 1-800-621-1675
Updated Prospectus Email Address info@ftportfolios.com
Updated Prospectus Web Address www.ftportfolios.com/fund-documents/etf/SQMX
C000260997 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Emerging Markets Buffer ETF - June
Class Name FT Vest Emerging Markets Buffer ETF - June
Trading Symbol TJUN
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Emerging Markets Buffer ETF - June (the “Fund”) for the period of June 20, 2025 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/TJUN. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/TJUN
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Emerging Markets Buffer ETF - June $98(1) 0.95%(2)
(1)
The Fund commenced investment operations on June 20, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 98 [19]
Expense Ratio, Percent 0.95% [20]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 17.64% for the period from the Fund’s inception on June 20, 2025 through May 31, 2026. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 49.77% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 17.89 %
Changes in other Variables 0.65 %
Fees and Expenses (pro-rated annual expense ratio) -0.90 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (June 20, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(6/20/25)
FT Vest Emerging Markets Buffer ETF - June 17.64%
MSCI Emerging Markets Index 49.77%
Performance Inception Date Jun. 20, 2025
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]
Visit www.ftportfolios.com/etf/TJUN for more recent performance information.
Net Assets $ 2,354,272
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 18,846
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $2,354,272
Total number of portfolio holdings 5
Total advisory fee paid $18,846
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.4%
Purchased Options 124.2%
Written Options (24.5%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000261392 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Laddered Max Buffer ETF
Class Name FT Vest Laddered Max Buffer ETF
Trading Symbol BUFH
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Laddered Max Buffer ETF (the “Fund”) for the period of June 24, 2025 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/BUFH. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/BUFH
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Laddered Max Buffer ETF $10(1) (2) 0.10%(1) (3)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
The Fund commenced investment operations on June 24, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(3)
Annualized.
Expenses Paid, Amount $ 10 [21],[22]
Expense Ratio, Percent 0.10% [21],[23]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 6.48% for the period from the Fund’s inception on June 24, 2025 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 25.81% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 3.66 %
Changes in other Variables 3.71 %
Fees and Expenses (pro-rated annual expense ratio)** -0.89 %
The Fund holds a portfolio that consists of a number of buffer funds, and thus is exposed to the combinations of FLexible EXchange® Options (“FLEX Options”) held by the funds in its portfolio.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the underlying buffer funds’ Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
** Includes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (June 24, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(6/24/25)
FT Vest Laddered Max Buffer ETF 6.48%
S&P 500® Index 25.81%
Performance Inception Date Jun. 24, 2025
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]
Visit www.ftportfolios.com/etf/BUFH for more recent performance information.
Net Assets $ 54,467,191
Holdings Count | Holding 13
Advisory Fees Paid, Amount $ 24,764
Investment Company Portfolio Turnover 1.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $54,467,191
Total number of portfolio holdings 13
Total advisory fee paid $24,764
Portfolio turnover rate 1%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Exchange-Traded Funds 100.0%
Money Market Funds 0.0%
Net Other Assets and Liabilities (0.0%)
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
C000261996 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Uncapped Accelerator ETF - July
Class Name FT Vest U.S. Equity Uncapped Accelerator ETF - July
Trading Symbol UXJL
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Uncapped Accelerator ETF - July (the “Fund”) for the period of July 18, 2025 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/UXJL. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/UXJL
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Uncapped Accelerator ETF - July $82(1) 0.85%(2)
(1)
The Fund commenced investment operations on July 18, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 82 [24]
Expense Ratio, Percent 0.85% [25]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 22.64% for the period from the Fund’s inception on July 18, 2025 through May 31, 2026. The Fund outperformed its benchmark, the S&P 500® Index, which returned 21.63% for the same Period.
This outperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 24.78 %
Changes in other Variables -1.40 %
Fees and Expenses (pro-rated annual expense ratio) -0.74 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (July 18, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(7/18/25)
FT Vest U.S. Equity Uncapped Accelerator ETF - July 22.64%
S&P 500® Index 21.63%
Performance Inception Date Jul. 18, 2025
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]
Visit www.ftportfolios.com/etf/UXJL for more recent performance information.
Net Assets $ 5,540,794
Holdings Count | Holding 4
Advisory Fees Paid, Amount $ 57,625
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $5,540,794
Total number of portfolio holdings 4
Total advisory fee paid $57,625
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.3%
Purchased Options 115.9%
Written Options (17.1%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000263943 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Dual Directional Buffer ETF - August
Class Name FT Vest U.S. Equity Dual Directional Buffer ETF - August
Trading Symbol DLAG
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Dual Directional Buffer ETF - August (the “Fund”) for the period of September 19, 2025 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DLAG. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DLAG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Dual Directional Buffer ETF - August $62(1) 0.85%(2)
(1)
The Fund commenced investment operations on September 19, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 62 [26]
Expense Ratio, Percent 0.85% [27]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 7.89% for the period from the Fund’s inception on September 19, 2025 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 14.66% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 6.26 %
Changes in other Variables 2.22 %
Fees and Expenses (pro-rated annual expense ratio) -0.59 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (September 19, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(9/19/25)
FT Vest U.S. Equity Dual Directional Buffer ETF - August 7.89%
S&P 500® Index 14.66%
Performance Inception Date Sep. 19, 2025
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]
Visit www.ftportfolios.com/etf/DLAG for more recent performance information.
Net Assets $ 16,468,459
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 118,079
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $16,468,459
Total number of portfolio holdings 6
Total advisory fee paid $118,079
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.6%
Purchased Options 106.4%
Written Options (6.9%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000263944 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Dual Directional Buffer ETF - February
Class Name FT Vest U.S. Equity Dual Directional Buffer ETF - February
Trading Symbol DLFE
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Dual Directional Buffer ETF - February (the “Fund”) for the period of February 20, 2026 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DLFE. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DLFE
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Dual Directional Buffer ETF - February $24(1) 0.85%(2)
(1)
The Fund commenced investment operations on February 20, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 24 [28]
Expense Ratio, Percent 0.85% [29]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 4.48% for the period from the Fund’s inception on February 20, 2026 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 10.05% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 4.85 %
Changes in other Variables -0.14 %
Fees and Expenses (pro-rated annual expense ratio) -0.23 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (February 20, 2026 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(2/20/26)
FT Vest U.S. Equity Dual Directional Buffer ETF - February 4.48%
S&P 500® Index 10.05%
Performance Inception Date Feb. 20, 2026
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]
Visit www.ftportfolios.com/etf/DLFE for more recent performance information.
Net Assets $ 64,965,983
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 127,904
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $64,965,983
Total number of portfolio holdings 6
Total advisory fee paid $127,904
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.0%
Purchased Options 114.1%
Written Options (15.0%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000263945 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Dual Directional Buffer ETF - May
Class Name FT Vest U.S. Equity Dual Directional Buffer ETF - May
Trading Symbol DLMY
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Dual Directional Buffer ETF - May (the “Fund”) for the period of May 15, 2026 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DLMY. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DLMY
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Dual Directional Buffer ETF - May $4(1) 0.85%(2)
(1)
The Fund commenced investment operations on May 15, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 4 [30]
Expense Ratio, Percent 0.85% [31]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 1.29% for the period from the Fund’s inception on May 15, 2026 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 2.36% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 1.19 %
Changes in other Variables 0.14 %
Fees and Expenses (pro-rated annual expense ratio) -0.04 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (May 15, 2026 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(5/15/26)
FT Vest U.S. Equity Dual Directional Buffer ETF - May 1.29%
S&P 500® Index 2.36%
Performance Inception Date May 15, 2026
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]
Visit www.ftportfolios.com/etf/DLMY for more recent performance information.
Net Assets $ 38,938,877
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 5,420
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $38,938,877
Total number of portfolio holdings 6
Total advisory fee paid $5,420
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.1%
Purchased Options 118.7%
Written Options (19.8%)
Net Other Assets and Liabilities (0.0%)
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
C000263946 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Dual Directional Buffer ETF - November
Class Name FT Vest U.S. Equity Dual Directional Buffer ETF - November
Trading Symbol DLNV
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Dual Directional Buffer ETF - November (the “Fund”) for the period of November 21, 2025 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DLNV. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DLNV
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Dual Directional Buffer ETF - November $47(1) 0.85%(2)
(1)
The Fund commenced investment operations on November 21, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 47 [32]
Expense Ratio, Percent 0.85% [33]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 8.34% for the period from the Fund’s inception on November 21, 2025 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 15.50% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 7.35 %
Changes in other Variables 1.43 %
Fees and Expenses (pro-rated annual expense ratio) -0.44 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (November 21, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(11/21/25)
FT Vest U.S. Equity Dual Directional Buffer ETF - November 8.34%
S&P 500® Index 15.50%
Performance Inception Date Nov. 21, 2025
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]
Visit www.ftportfolios.com/etf/DLNV for more recent performance information.
Net Assets $ 19,709,123
Holdings Count | Holding 6
Advisory Fees Paid, Amount $ 71,599
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $19,709,123
Total number of portfolio holdings 6
Total advisory fee paid $71,599
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.7%
Purchased Options 109.7%
Written Options (10.3%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000263950 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Buffer & Digital Return ETF - April
Class Name FT Vest U.S. Equity Buffer & Digital Return ETF - April
Trading Symbol DGAP
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Buffer & Digital Return ETF - April (the “Fund”) for the period of April 17, 2026 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DGAP. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DGAP
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Buffer & Digital Return ETF - April $11(1) 0.85%(2)
(1)
The Fund commenced investment operations on April 17, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 11 [34]
Expense Ratio, Percent 0.85% [35]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 1.91% for the period from the Fund’s inception on April 17, 2026 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 6.50% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 1.93 %
Changes in other Variables 0.08 %
Fees and Expenses (pro-rated annual expense ratio) -0.10 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (April 17, 2026 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(4/17/26)
FT Vest U.S. Equity Buffer & Digital Return ETF - April 1.91%
S&P 500® Index 6.50%
Performance Inception Date Apr. 17, 2026
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]
Visit www.ftportfolios.com/etf/DGAP for more recent performance information.
Net Assets $ 6,079,461
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 4,140
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $6,079,461
Total number of portfolio holdings 7
Total advisory fee paid $4,140
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 1.1%
Purchased Options 189.3%
Written Options (90.3%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000263951 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Buffer & Digital Return ETF - January
Class Name FT Vest U.S. Equity Buffer & Digital Return ETF - January
Trading Symbol DGJA
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Buffer & Digital Return ETF - January (the “Fund”) for the period of January 16, 2026 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DGJA. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DGJA
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Buffer & Digital Return ETF - January $32(1) 0.85%(2)
(1)
The Fund commenced investment operations on January 16, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 32 [36]
Expense Ratio, Percent 0.85% [37]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 3.45% for the period from the Fund’s inception on January 16, 2026 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 9.69% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 3.29 %
Changes in other Variables 0.47 %
Fees and Expenses (pro-rated annual expense ratio) -0.31 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (January 16, 2026 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(1/16/26)
FT Vest U.S. Equity Buffer & Digital Return ETF - January 3.45%
S&P 500® Index 9.69%
Performance Inception Date Jan. 16, 2026
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]
Visit www.ftportfolios.com/etf/DGJA for more recent performance information.
Net Assets $ 4,722,671
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 12,292
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $4,722,671
Total number of portfolio holdings 7
Total advisory fee paid $12,292
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.9%
Purchased Options 187.7%
Written Options (88.5%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000263952 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest U.S. Equity Buffer & Digital Return ETF - October
Class Name FT Vest U.S. Equity Buffer & Digital Return ETF - October
Trading Symbol DGOC
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest U.S. Equity Buffer & Digital Return ETF - October (the “Fund”) for the period of October 17, 2025 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DGOC. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DGOC
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest U.S. Equity Buffer & Digital Return ETF - October $54(1) 0.85%(2)
(1)
The Fund commenced investment operations on October 17, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(2)
Annualized.
Expenses Paid, Amount $ 54 [38]
Expense Ratio, Percent 0.85% [39]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 5.86% for the period from the Fund’s inception on October 17, 2025 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 14.58% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 4.03 %
Changes in other Variables 2.35 %
Fees and Expenses (pro-rated annual expense ratio) -0.52 %
The Fund holds a combination of FLexible EXchange® Options (“FLEX Options”) designed to target the Fund’s objective.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the Fund’s Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (October 17, 2025 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(10/17/25)
FT Vest U.S. Equity Buffer & Digital Return ETF - October 5.86%
S&P 500® Index 14.58%
Performance Inception Date Oct. 17, 2025
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]
Visit www.ftportfolios.com/etf/DGOC for more recent performance information.
Net Assets $ 4,852,463
Holdings Count | Holding 7
Advisory Fees Paid, Amount $ 17,375
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $4,852,463
Total number of portfolio holdings 7
Total advisory fee paid $17,375
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Money Market Funds 0.7%
Purchased Options 199.5%
Written Options (100.1%)
Net Other Assets and Liabilities (0.1%)
Total 100.0%
C000272279 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Laddered U.S. Equity Uncapped Accelerator ETF
Class Name FT Vest Laddered U.S. Equity Uncapped Accelerator ETF
Trading Symbol BFXU
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Laddered U.S. Equity Uncapped Accelerator ETF (the “Fund”) for the period of April 7, 2026 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/BFXU. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/BFXU
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Laddered U.S. Equity Uncapped Accelerator ETF $2(1) (2) 0.10%(1) (3)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
The Fund commenced investment operations on April 7, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(3)
Annualized.
Expenses Paid, Amount $ 2 [40],[41]
Expense Ratio, Percent 0.10% [40],[42]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 16.62% for the period from the Fund’s inception on April 7, 2026 through May 31, 2026. The Fund outperformed its benchmark, the S&P 500® Index, which returned 14.73% for the same Period.
This outperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 16.90 %
Changes in other Variables -0.14 %
Fees and Expenses (pro-rated annual expense ratio)** -0.14 %
The Fund holds a portfolio that consists of a number of buffer funds, and thus is exposed to the combinations of FLexible EXchange® Options (“FLEX Options”) held by the funds in its portfolio.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the underlying buffer funds’ Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
** Includes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (April 7, 2026 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(4/7/26)
FT Vest Laddered U.S. Equity Uncapped Accelerator ETF 16.62%
S&P 500® Index 14.73%
Performance Inception Date Apr. 07, 2026
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]
Visit www.ftportfolios.com/etf/BFXU for more recent performance information.
Net Assets $ 1,175,513
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 165
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $1,175,513
Total number of portfolio holdings 5
Total advisory fee paid $165
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Exchange-Traded Funds 100.0%
Money Market Funds 0.0%
Net Other Assets and Liabilities (0.0%)
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
C000272281 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Laddered U.S. Equity Equal Weight Buffer ETF
Class Name FT Vest Laddered U.S. Equity Equal Weight Buffer ETF
Trading Symbol BFEW
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Laddered U.S. Equity Equal Weight Buffer ETF (the “Fund”) for the period of April 7, 2026 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/BFEW. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/BFEW
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Laddered U.S. Equity Equal Weight Buffer ETF $2(1) (2) 0.10%(1) (3)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
The Fund commenced investment operations on April 7, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(3)
Annualized.
Expenses Paid, Amount $ 2 [43],[44]
Expense Ratio, Percent 0.10% [43],[45]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 5.01% for the period from the Fund’s inception on April 7, 2026 through May 31, 2026. The Fund underperformed its benchmark, the S&P 500® Equal Weight Index, which returned 7.93% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 8.97 %
Changes in other Variables -3.82 %
Fees and Expenses (pro-rated annual expense ratio)** -0.14 %
The Fund holds a portfolio that consists of a number of buffer funds, and thus is exposed to the combinations of FLexible EXchange® Options (“FLEX Options”) held by the funds in its portfolio.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the underlying buffer funds’ Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
** Includes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (April 7, 2026 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(4/7/26)
FT Vest Laddered U.S. Equity Equal Weight Buffer ETF 5.01%
S&P 500® Index 14.73%
S&P 500® Equal Weight Index 7.93%
Performance Inception Date Apr. 07, 2026
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]
Visit www.ftportfolios.com/etf/BFEW for more recent performance information.
Net Assets $ 1,048,829
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 152
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $1,048,829
Total number of portfolio holdings 5
Total advisory fee paid $152
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Exchange-Traded Funds 100.0%
Money Market Funds 0.0%
Net Other Assets and Liabilities (0.0%)
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
C000272535 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Laddered Emerging Markets Buffer ETF
Class Name FT Vest Laddered Emerging Markets Buffer ETF
Trading Symbol BUFE
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FT Vest Laddered Emerging Markets Buffer ETF (the “Fund”) for the period of April 7, 2026 (commencement of investment operations) to May 31, 2026 (the “Period”).
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/BUFE. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/BUFE
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
FT Vest Laddered Emerging Markets Buffer ETF $2(1) (2) 0.10%(1) (3)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
The Fund commenced investment operations on April 7, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
(3)
Annualized.
Expenses Paid, Amount $ 2 [46],[47]
Expense Ratio, Percent 0.10% [46],[48]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 6.88% for the period from the Fund’s inception on April 7, 2026 through May 31, 2026. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 20.39% for the same Period.
This underperformance was due to the following:
Fund Net Asset Value Performance Attributed to*:
Changes in Reference Asset 8.35 %
Changes in other Variables -1.31 %
Fees and Expenses (pro-rated annual expense ratio)** -0.16 %
The Fund holds a portfolio that consists of a number of buffer funds, and thus is exposed to the combinations of FLexible EXchange® Options (“FLEX Options”) held by the funds in its portfolio.
* The Fund’s performance is impacted by changes in the values of the FLEX Options to which it is exposed. We attribute (allocate) the impact on the Fund’s performance into three components. The first of the three components is the impact on the Fund’s performance due to changes in the underlying buffer funds’ Reference Asset. The second component is the aggregate impact on the Fund’s performance due to changes in other variables that impact FLEX Options prices - these include changes in a) the Reference Asset’s dividends, b) interest rates, c) implied volatility, and d) time to option expiration. The third component is from the Fund’s fees and expenses incurred during the Period.
** Includes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
FUND PERFORMANCE (April 7, 2026 to May 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (as of May 31, 2026) Since
Inception
(4/7/26)
FT Vest Laddered Emerging Markets Buffer ETF 6.88%
MSCI Emerging Markets Index 20.39%
Performance Inception Date Apr. 07, 2026
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]
Visit www.ftportfolios.com/etf/BUFE for more recent performance information.
Net Assets $ 1,072,035
Holdings Count | Holding 5
Advisory Fees Paid, Amount $ 157
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of May 31, 2026)
Fund net assets $1,072,035
Total number of portfolio holdings 5
Total advisory fee paid $157
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of May 31, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
Exchange-Traded Funds 100.0%
Money Market Funds 0.0%
Net Other Assets and Liabilities (0.0%)
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
[1]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[2]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[3]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[4]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[5]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[6]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.95%.
[7]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.95%.
[8]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[9]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[10]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[11]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[12] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[13] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[14]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[15]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[16] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[17] Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[18]
Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.85%.
[19]
The Fund commenced investment operations on June 20, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[20]
Annualized.
[21] Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
[22] The Fund commenced investment operations on June 24, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[23] Annualized.
[24]
The Fund commenced investment operations on July 18, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[25]
Annualized.
[26]
The Fund commenced investment operations on September 19, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[27]
Annualized.
[28]
The Fund commenced investment operations on February 20, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[29]
Annualized.
[30]
The Fund commenced investment operations on May 15, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[31]
Annualized.
[32]
The Fund commenced investment operations on November 21, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[33]
Annualized.
[34]
The Fund commenced investment operations on April 17, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[35]
Annualized.
[36] The Fund commenced investment operations on January 16, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[37] Annualized.
[38]
The Fund commenced investment operations on October 17, 2025. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[39]
Annualized.
[40] Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
[41] The Fund commenced investment operations on April 7, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[42] Annualized.
[43] Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
[44] The Fund commenced investment operations on April 7, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[45] Annualized.
[46] Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
[47] The Fund commenced investment operations on April 7, 2026. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.
[48] Annualized.