v3.26.1
Shareholder Report
6 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name First Trust Exchange-Traded Fund IV
Entity Central Index Key 0001517936
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
C000102880 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust North American Energy Infrastructure Fund
Class Name First Trust North American Energy Infrastructure Fund
Trading Symbol EMLP
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust North American Energy Infrastructure Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/EMLP. 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/EMLP
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust North American Energy Infrastructure Fund $51(1) 0.94%(1) (2)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
Annualized.
Expenses Paid, Amount $ 51 [1]
Expense Ratio, Percent 0.94% [1],[2]
Net Assets $ 4,073,269,359
Holdings Count | Holding 64
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $4,073,269,359
Total number of portfolio holdings 64
Portfolio turnover rate 12%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Energy Transfer, L.P. 7.5%
Enterprise Products Partners, L.P. 7.2%
Morgan Stanley Institutional Liquidity Funds - Treasury Portfolio - Institutional Class 7.0%
MPLX, L.P. 4.0%
Plains GP Holdings, L.P., Class A 3.9%
Kinder Morgan, Inc. 3.7%
National Fuel Gas Co. 3.2%
Southern (The) Co. 2.7%
PPL Corp. 2.5%
Entergy Corp. 2.4%
Industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Energy Transfer, L.P. 7.5%
Enterprise Products Partners, L.P. 7.2%
Morgan Stanley Institutional Liquidity Funds - Treasury Portfolio - Institutional Class 7.0%
MPLX, L.P. 4.0%
Plains GP Holdings, L.P., Class A 3.9%
Kinder Morgan, Inc. 3.7%
National Fuel Gas Co. 3.2%
Southern (The) Co. 2.7%
PPL Corp. 2.5%
Entergy Corp. 2.4%
C000105232 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Senior Loan Fund
Class Name First Trust Senior Loan Fund
Trading Symbol FTSL
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Senior Loan Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTSL. 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/FTSL
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Senior Loan Fund $37(1) 0.75%(1) (2)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
Annualized.
Expenses Paid, Amount $ 37 [3]
Expense Ratio, Percent 0.75% [3],[4]
Material Change Date Feb. 01, 2026
Net Assets $ 2,286,027,902
Holdings Count | Holding 296
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $2,286,027,902
Total number of portfolio holdings 296
Portfolio turnover rate 51%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Industry Allocation
Insurance 10.7%
Money Market Funds 9.2%
Software 8.6%
Hotels, Restaurants & Leisure 7.5%
Health Care Providers & Services 5.0%
Media 4.0%
Commercial Services & Supplies 4.0%
Trading Companies & Distributors 3.9%
Machinery 3.6%
All Other 43.5%
Credit Quality (1)
Graphical Representation - Allocation 2 Chart
(1) The ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the credit worthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Credit Quality Explanation [Text Block] The ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the credit worthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Credit Ratings Selection [Text Block] The ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are privately rated.
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FTSL or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.69%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Effective March 10, 2026, the Fund amended its definition of Senior Loans to include second lien senior floating rate bank loans.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.69%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FTSL 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/FTSL
C000121641 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Tactical High Yield ETF
Class Name First Trust Tactical High Yield ETF
Trading Symbol HYLS
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Tactical High Yield ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/HYLS. 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/HYLS
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Tactical High Yield ETF $43 0.87%(1)
(1)
Annualized.
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.87% [5]
Material Change Date Feb. 01, 2026
Net Assets $ 1,638,521,326
Holdings Count | Holding 308
Investment Company Portfolio Turnover 40.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $1,638,521,326
Total number of portfolio holdings 308
Portfolio turnover rate 40%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Industry Allocation
Insurance 12.7%
Media 7.1%
Software 6.9%
Hotels, Restaurants & Leisure 6.6%
Trading Companies & Distributors 5.5%
Health Care Providers & Services 4.7%
Commercial Services & Supplies 4.1%
Financial Services 3.6%
Building Products 3.6%
All Other 45.2%
Credit Quality (1)
Graphical Representation - Allocation 2 Chart
(1) The ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the credit worthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Credit Quality Explanation [Text Block] The ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the credit worthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Credit Ratings Selection [Text Block] The ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are privately rated.
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/HYLS or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.69%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.69%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/HYLS 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/HYLS
C000142755 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Enhanced Short Maturity ETF
Class Name First Trust Enhanced Short Maturity ETF
Trading Symbol FTSM
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Enhanced Short Maturity ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTSM. 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/FTSM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Enhanced Short Maturity ETF $17 0.34%(1)
(1)
Annualized.
Expenses Paid, Amount $ 17
Expense Ratio, Percent 0.34% [6]
Material Change Date Feb. 01, 2026
Net Assets $ 6,399,095,042
Holdings Count | Holding 660
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $6,399,095,042
Total number of portfolio holdings 660
Portfolio turnover rate 36%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
AutoNation, Inc., 4.11%, 05/01/26 1.0%
U.S. Treasury Note, 3.75%, 04/30/27 1.0%
Targa Resources Corp., 3.95%, 05/01/26 0.9%
Energy Transfer, L.P., 3.93%, 05/01/26 0.6%
Quanta Services, Inc., 4.15%, 05/01/26 0.6%
Huntington National Bank (The), 4.87%, 04/12/28 0.6%
T-Mobile USA, Inc., 3.75%, 04/15/27 0.5%
Haleon US Capital LLC, 3.38%, 03/24/27 0.5%
PRA Health Sciences, Inc., 2.88%, 07/15/26 0.5%
Kinder Morgan, Inc., 1.75%, 11/15/26 0.5%
Credit Quality (1)
Graphical Representation - Allocation 2 Chart
(1) The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO. For situations in which a security is rated by more than one RSRO and the ratings are not equivalent, the highest rating is used. Ratings are measured highest to lowest on a scale that generally ranges from AAA to D for long-term ratings and A-1 to C for short-term ratings. Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher or a short-term credit rating of A-3 or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Treasury, U.S. Agency and U.S. Agency mortgage-backed securities appear under “Government & Agency.” Credit ratings are subject to change. For newly issued debt securities for which only an expected rating from a NRSRO is available, the Fund may treat such expected rating as if it were a final rating for purposes of determining the credit quality categories shown.
Credit Quality Explanation [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO. For situations in which a security is rated by more than one RSRO and the ratings are not equivalent, the highest rating is used. Ratings are measured highest to lowest on a scale that generally ranges from AAA to D for long-term ratings and A-1 to C for short-term ratings. Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher or a short-term credit rating of A-3 or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Treasury, U.S. Agency and U.S. Agency mortgage-backed securities appear under “Government & Agency.” Credit ratings are subject to change. For newly issued debt securities for which only an expected rating from a NRSRO is available, the Fund may treat such expected rating as if it were a final rating for purposes of determining the credit quality categories shown.
Credit Ratings Selection [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO.
Largest Holdings [Text Block]
Top Ten Holdings
AutoNation, Inc., 4.11%, 05/01/26 1.0%
U.S. Treasury Note, 3.75%, 04/30/27 1.0%
Targa Resources Corp., 3.95%, 05/01/26 0.9%
Energy Transfer, L.P., 3.93%, 05/01/26 0.6%
Quanta Services, Inc., 4.15%, 05/01/26 0.6%
Huntington National Bank (The), 4.87%, 04/12/28 0.6%
T-Mobile USA, Inc., 3.75%, 04/15/27 0.5%
Haleon US Capital LLC, 3.38%, 03/24/27 0.5%
PRA Health Sciences, Inc., 2.88%, 07/15/26 0.5%
Kinder Morgan, Inc., 1.75%, 11/15/26 0.5%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FTSM or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.29%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.29%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FTSM 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/FTSM
C000144296 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust High Income Strategic Focus ETF
Class Name First Trust High Income Strategic Focus ETF
Trading Symbol HISF
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust High Income Strategic Focus ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/HISF. 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/HISF
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust High Income Strategic Focus ETF $6(1) 0.12%(1) (2)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
Annualized.
Expenses Paid, Amount $ 6 [7]
Expense Ratio, Percent 0.12% [7],[8]
Material Change Date Feb. 01, 2026
Net Assets $ 91,138,271
Holdings Count | Holding 12
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $91,138,271
Total number of portfolio holdings 12
Portfolio turnover rate 21%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 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%.
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/HISF or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.10%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.10%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/HISF 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/HISF
C000144500 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Low Duration Opportunities ETF
Class Name First Trust Low Duration Opportunities ETF
Trading Symbol LMBS
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Low Duration Opportunities ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/LMBS. 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/LMBS
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Low Duration Opportunities ETF $32(1) 0.64%(1) (2)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
Annualized.
Expenses Paid, Amount $ 32 [9]
Expense Ratio, Percent 0.64% [9],[10]
Net Assets $ 6,162,856,749
Holdings Count | Holding 1,227
Investment Company Portfolio Turnover 105.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $6,162,856,749
Total number of portfolio holdings 1,227
Portfolio turnover rate 105%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
U.S. Government Agency Mortgage-Backed Securities 75.2%
U.S. Government Bonds and Notes 10.6%
Mortgage-Backed Securities 8.1%
Asset-Backed Securities 1.5%
U.S. Government Agency Securities 0.1%
Exchange-Traded Funds 0.1%
U.S. Treasury Bills 10.9%
Money Market Funds 1.0%
U.S. Government Agency Mortgage-Backed Securities Sold Short (1.3%)
Written Options (0.3%)
Net Other Assets and Liabilities(1) (5.9%)
Total 100.0%
Credit Quality (2)
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
(1) Includes variation margin on futures contracts.
(2) The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody's Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. A credit rating is an assessment provided by a NRSRO of the creditworthiness of an issuer with respect to debt obligations. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Agency, U.S. Agency mortgage-backed, and U.S. Treasury securities appear under “Government & Agency.” Credit ratings are subject to change.
Credit Quality Explanation [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody's Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. A credit rating is an assessment provided by a NRSRO of the creditworthiness of an issuer with respect to debt obligations. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Agency, U.S. Agency mortgage-backed, and U.S. Treasury securities appear under “Government & Agency.” Credit ratings are subject to change.
Credit Ratings Selection [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody's Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO.
C000159952 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust SSI Strategic Convertible Securities ETF
Class Name First Trust SSI Strategic Convertible Securities ETF
Trading Symbol FCVT
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust SSI Strategic Convertible Securities ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FCVT. 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/FCVT
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust SSI Strategic Convertible Securities ETF $50 0.95%(1)
(1)
Annualized.
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.95% [11]
Net Assets $ 116,537,560
Holdings Count | Holding 142
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $116,537,560
Total number of portfolio holdings 142
Portfolio turnover rate 44%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Western Digital Corp., 3.00%, 11/15/28 4.5%
Lumentum Holdings, Inc., 0.38%, 03/15/32 3.9%
Dreyfus Government Cash Management Fund, Institutional Shares, 3.53% 2.6%
Boeing (The) Co., 6.00%, 10/15/27 2.4%
Morgan Stanley Finance LLC, 0.13%, 02/07/28 2.0%
ON Semiconductor Corp., 0.50%, 03/01/29 1.9%
NextEra Energy Capital Holdings, Inc., 3.00%, 03/01/27 1.8%
Live Nation Entertainment, Inc., 2.88%, 01/15/30 1.8%
Morgan Stanley Finance LLC, 0.13%, 04/26/30 1.6%
Bloom Energy Corp., 0.00%, 11/15/30 1.6%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Western Digital Corp., 3.00%, 11/15/28 4.5%
Lumentum Holdings, Inc., 0.38%, 03/15/32 3.9%
Dreyfus Government Cash Management Fund, Institutional Shares, 3.53% 2.6%
Boeing (The) Co., 6.00%, 10/15/27 2.4%
Morgan Stanley Finance LLC, 0.13%, 02/07/28 2.0%
ON Semiconductor Corp., 0.50%, 03/01/29 1.9%
NextEra Energy Capital Holdings, Inc., 3.00%, 03/01/27 1.8%
Live Nation Entertainment, Inc., 2.88%, 01/15/30 1.8%
Morgan Stanley Finance LLC, 0.13%, 04/26/30 1.6%
Bloom Energy Corp., 0.00%, 11/15/30 1.6%
C000207230 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Long DurationOpportunities ETF
Class Name First Trust Long DurationOpportunities ETF
Trading Symbol LGOV
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Long Duration Opportunities ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/LGOV. 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/LGOV
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Long Duration Opportunities ETF $27(1) 0.54%(1) (2)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
Annualized.
Expenses Paid, Amount $ 27 [12]
Expense Ratio, Percent 0.54% [12],[13]
Material Change Date Feb. 01, 2026
Net Assets $ 664,498,282
Holdings Count | Holding 176
Investment Company Portfolio Turnover 92.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $664,498,282
Total number of portfolio holdings 176
Portfolio turnover rate 92%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
U.S. Government Agency Mortgage-Backed Securities 76.3%
U.S. Government Bonds and Notes 17.9%
U.S. Government Agency Securities 2.8%
Exchange-Traded Funds 0.3%
U.S. Treasury Bills 1.2%
Purchased Options 0.0%
U.S. Government Agency Mortgage-Backed Securities Sold Short (2.1%)
Written Options (0.4%)
Net Other Assets and Liabilities(1) 4.0%
Total 100.0%
Credit Quality (2)
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
(1) Includes variation margin on futures contracts.
(2) The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody's Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. A credit rating is an assessment provided by a NRSRO, of the creditworthiness of an issuer with respect to debt obligations. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Agency, U.S. Agency mortgage-backed, and U.S. Treasury securities appear under “Government & Agency.” Credit ratings are subject to change.
Credit Quality Explanation [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody's Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. A credit rating is an assessment provided by a NRSRO, of the creditworthiness of an issuer with respect to debt obligations. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Agency, U.S. Agency mortgage-backed, and U.S. Treasury securities appear under “Government & Agency.” Credit ratings are subject to change.
Credit Ratings Selection [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody's Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO.
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/LGOV or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.49%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.49%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/LGOV 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/LGOV
C000213865 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust EIP Power Solutions ETF
Class Name First Trust EIP Power Solutions ETF
Trading Symbol FPWR
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust EIP Power Solutions ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FPWR. 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/FPWR
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust EIP Power Solutions ETF $51(1) 0.95%(1) (2)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
Annualized.
Expenses Paid, Amount $ 51 [14]
Expense Ratio, Percent 0.95% [14],[15]
Net Assets $ 26,814,085
Holdings Count | Holding 60
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $26,814,085
Total number of portfolio holdings 60
Portfolio turnover rate 12%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Morgan Stanley Institutional Liquidity Funds - Treasury Portfolio - Institutional Class 5.6%
Duke Energy Corp. 3.4%
Southern (The) Co. 3.2%
Energy Transfer, L.P. 3.2%
PPL Corp. 3.2%
National Fuel Gas Co. 3.1%
Enterprise Products Partners, L.P. 3.0%
WEC Energy Group, Inc. 2.9%
American Electric Power Co., Inc. 2.9%
Cheniere Energy Partners, L.P. 2.8%
Industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Morgan Stanley Institutional Liquidity Funds - Treasury Portfolio - Institutional Class 5.6%
Duke Energy Corp. 3.4%
Southern (The) Co. 3.2%
Energy Transfer, L.P. 3.2%
PPL Corp. 3.2%
National Fuel Gas Co. 3.1%
Enterprise Products Partners, L.P. 3.0%
WEC Energy Group, Inc. 2.9%
American Electric Power Co., Inc. 2.9%
Cheniere Energy Partners, L.P. 2.8%
C000225182 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest S&P 500® Dividend Aristocrats Target Income ETF®
Class Name FT Vest S&P 500® Dividend Aristocrats Target Income ETF®
Trading Symbol KNG
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest S&P 500® Dividend Aristocrats Target Income ETF® (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/KNG. 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/KNG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 S&P 500® Dividend Aristocrats Target Income ETF® $38 0.74%(1)
(1)
Annualized.
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.74% [16]
Net Assets $ 3,369,358,909
Holdings Count | Holding 139
Investment Company Portfolio Turnover 79.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $3,369,358,909
Total number of portfolio holdings 139
Portfolio turnover rate 79%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
Common Stocks 100.2%
Money Market Funds 0.3%
Written Options (0.5%)
Net Other Assets and Liabilities 0.0%
Total 100.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
C000229146 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Limited Duration Investment Grade Corporate ETF
Class Name First Trust Limited Duration Investment Grade Corporate ETF
Trading Symbol FSIG
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Limited Duration Investment Grade Corporate ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FSIG. 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/FSIG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Limited Duration Investment Grade Corporate ETF $24 0.48%(1)
(1)
Annualized.
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.48% [17]
Material Change Date Feb. 01, 2026
Net Assets $ 1,507,235,118
Holdings Count | Holding 320
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $1,507,235,118
Total number of portfolio holdings 320
Portfolio turnover rate 30%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Crowdstrike Holdings, Inc., 3.00%, 02/15/29 1.4%
MSCI, Inc., 4.00%, 11/15/29 1.3%
Fair Isaac Corp., 6.00%, 05/15/33 1.0%
Energy Transfer, L.P., 3.93%, 05/01/26 1.0%
Vulcan Materials Co., 3.85%, 05/01/26 1.0%
United Rentals North America, Inc., 6.00%, 12/15/29 1.0%
Smurfit Kappa Treasury ULC, 5.20%, 01/15/30 0.9%
Constellation Software, Inc., 5.16%, 02/16/29 0.9%
Berry Global, Inc., 5.50%, 04/15/28 0.8%
Quanta Services, Inc., 4.50%, 01/15/31 0.8%
Credit Quality (1)
Graphical Representation - Allocation 2 Chart
(1) The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Ratings are measured highest to lowest on a scale that generally ranges from AAA to D for long-term ratings and A-1+ to C for short-term ratings. Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher or a short-term credit rating of A-3 or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Treasury, U.S. Agency and U.S. Agency mortgage-backed securities appear under “Government & Agency”. Credit ratings are subject to change.
Credit Quality Explanation [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Ratings are measured highest to lowest on a scale that generally ranges from AAA to D for long-term ratings and A-1+ to C for short-term ratings. Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher or a short-term credit rating of A-3 or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Treasury, U.S. Agency and U.S. Agency mortgage-backed securities appear under “Government & Agency”. Credit ratings are subject to change.
Credit Ratings Selection [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO.
Largest Holdings [Text Block]
Top Ten Holdings
Crowdstrike Holdings, Inc., 3.00%, 02/15/29 1.4%
MSCI, Inc., 4.00%, 11/15/29 1.3%
Fair Isaac Corp., 6.00%, 05/15/33 1.0%
Energy Transfer, L.P., 3.93%, 05/01/26 1.0%
Vulcan Materials Co., 3.85%, 05/01/26 1.0%
United Rentals North America, Inc., 6.00%, 12/15/29 1.0%
Smurfit Kappa Treasury ULC, 5.20%, 01/15/30 0.9%
Constellation Software, Inc., 5.16%, 02/16/29 0.9%
Berry Global, Inc., 5.50%, 04/15/28 0.8%
Quanta Services, Inc., 4.50%, 01/15/31 0.8%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FSIG or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.44%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.44%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FSIG 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/FSIG
C000237940 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Rising Dividend Achievers Target Income ETF
Class Name FT Vest Rising Dividend Achievers Target Income ETF
Trading Symbol RDVI
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest Rising Dividend Achievers Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RDVI. 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/RDVI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 Rising Dividend Achievers Target Income ETF $39 0.75%(1)
(1)
Annualized.
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.75% [18]
Net Assets $ 3,073,502,895
Holdings Count | Holding 75
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $3,073,502,895
Total number of portfolio holdings 75
Portfolio turnover rate 19%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
Common Stocks 100.0%
Money Market Funds 0.1%
Written Options (0.1%)
Net Other Assets and Liabilities 0.0%
Total 100.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
C000238479 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Energy Income Partners Strategy ETF
Class Name FT Energy Income Partners Strategy ETF
Trading Symbol EIPX
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Energy Income Partners Strategy ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/EIPX. 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/EIPX
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 Energy Income Partners Strategy ETF $54 0.95%(1)
(1)
Annualized.
Expenses Paid, Amount $ 54
Expense Ratio, Percent 0.95% [19]
Net Assets $ 531,813,599
Holdings Count | Holding 85
Investment Company Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $531,813,599
Total number of portfolio holdings 85
Portfolio turnover rate 22%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Morgan Stanley Institutional Liquidity Funds - Treasury Portfolio - Institutional Class 9.0%
Enterprise Products Partners, L.P. 7.1%
Energy Transfer, L.P. 6.5%
MPLX, L.P. 3.8%
National Fuel Gas Co. 2.9%
Kinder Morgan, Inc. 2.6%
Plains GP Holdings, L.P., Class A 2.6%
ONEOK, Inc. 2.5%
Shell PLC, ADR 1.9%
Exxon Mobil Corp. 1.9%
Industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Morgan Stanley Institutional Liquidity Funds - Treasury Portfolio - Institutional Class 9.0%
Enterprise Products Partners, L.P. 7.1%
Energy Transfer, L.P. 6.5%
MPLX, L.P. 3.8%
National Fuel Gas Co. 2.9%
Kinder Morgan, Inc. 2.6%
Plains GP Holdings, L.P., Class A 2.6%
ONEOK, Inc. 2.5%
Shell PLC, ADR 1.9%
Exxon Mobil Corp. 1.9%
C000241798 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest DJIA® Dogs 10 Target Income ETF
Class Name FT Vest DJIA® Dogs 10 Target Income ETF
Trading Symbol DOGG
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest DJIA® Dogs 10 Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DOGG. 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/DOGG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 DJIA® Dogs 10 Target Income ETF $39 0.75%(1)
(1)
Annualized.
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.75% [20]
Net Assets $ 65,608,406
Holdings Count | Holding 42
Investment Company Portfolio Turnover 441.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $65,608,406
Total number of portfolio holdings 42
Portfolio turnover rate 441%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
Common Stocks 50.0%
U.S. Treasury Bills 61.6%
Money Market Funds 0.1%
Purchased Options 0.5%
Written Options (25.0%)
Net Other Assets and Liabilities 12.8%
Total 100.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
C000243637 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust IntermediateGovernment Opportunities ETF
Class Name First Trust IntermediateGovernment Opportunities ETF
Trading Symbol MGOV
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Intermediate Government Opportunities ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/MGOV. 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/MGOV
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Intermediate Government Opportunities ETF $27(1) 0.54%(1) (2)
(1)
Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
(2)
Annualized.
Expenses Paid, Amount $ 27 [21]
Expense Ratio, Percent 0.54% [21],[22]
Material Change Date Feb. 01, 2026
Net Assets $ 102,266,569
Holdings Count | Holding 205
Investment Company Portfolio Turnover 71.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $102,266,569
Total number of portfolio holdings 205
Portfolio turnover rate 71%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
U.S. Government Agency Mortgage-Backed Securities 82.2%
U.S. Government Bonds and Notes 13.8%
Mortgage-Backed Securities 8.6%
Asset-Backed Securities 1.2%
Money Market Funds 1.1%
Purchased Options 0.0%
U.S. Government Agency Mortgage-Backed Securities Sold Short (3.2%)
Written Options (0.3%)
Net Other Assets and Liabilities(1) (3.4%)
Total 100.0%
Credit Quality (2)
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
(1) Includes variation margin on futures contracts.
(2) The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. A credit rating is an assessment provided by a NRSRO of the creditworthiness of an issuer with respect to debt obligations. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Agency, U.S. Agency mortgage-backed, and U.S. Treasury securities appear under “Government & Agency.” Credit ratings are subject to change.
Credit Quality Explanation [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. A credit rating is an assessment provided by a NRSRO of the creditworthiness of an issuer with respect to debt obligations. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Agency, U.S. Agency mortgage-backed, and U.S. Treasury securities appear under “Government & Agency.” Credit ratings are subject to change.
Credit Ratings Selection [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, DBRS, Inc., Kroll Bond Rating Agency, Inc. or a comparably rated NRSRO.
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/MGOV or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.49%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.49%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/MGOV 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/MGOV
C000243955 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Intermediate DurationInvestment Grade Corporate ETF
Class Name First Trust Intermediate DurationInvestment Grade Corporate ETF
Trading Symbol FIIG
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Intermediate Duration Investment Grade Corporate ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FIIG. 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/FIIG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Intermediate Duration Investment Grade Corporate ETF $27 0.54%(1)
(1)
Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.54% [23]
Material Change Date Feb. 01, 2026
Net Assets $ 670,876,034
Holdings Count | Holding 251
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $670,876,034
Total number of portfolio holdings 251
Portfolio turnover rate 23%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Icon Investments Six DAC, 6.00%, 05/08/34 1.4%
Cooperatieve Rabobank U.A., 5.71%, 01/21/33 1.3%
Fair Isaac Corp., 6.00%, 05/15/33 1.1%
Solventum Corp., 5.60%, 03/23/34 1.0%
Constellation Software, Inc., 5.46%, 02/16/34 1.0%
Sodexo, Inc., 5.80%, 08/15/35 1.0%
Vulcan Materials Co., 3.85%, 05/01/26 1.0%
Morgan Stanley, 5.25%, 04/21/34 1.0%
Raymond James Financial, Inc., 4.90%, 09/11/35 0.9%
Roper Technologies, Inc., 4.90%, 10/15/34 0.9%
Credit Quality (1)
Graphical Representation - Allocation 2 Chart
(1) The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Ratings are measured highest to lowest on a scale that generally ranges from AAA to D for long-term ratings and A-1+ to C for short-term ratings. Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher or a short-term credit rating of A-3 or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Treasury, U.S. Agency and U.S. Agency mortgage-backed securities appear under “Government & Agency”. Credit ratings are subject to change.
Credit Quality Explanation [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Ratings are measured highest to lowest on a scale that generally ranges from AAA to D for long-term ratings and A-1+ to C for short-term ratings. Investment grade is defined as those issuers that have a long-term credit rating of BBB- or higher or a short-term credit rating of A-3 or higher. “NR” indicates no rating. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. U.S. Treasury, U.S. Agency and U.S. Agency mortgage-backed securities appear under “Government & Agency”. Credit ratings are subject to change.
Credit Ratings Selection [Text Block] The ratings are by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings, or a comparably rated NRSRO.
Largest Holdings [Text Block]
Top Ten Holdings
Icon Investments Six DAC, 6.00%, 05/08/34 1.4%
Cooperatieve Rabobank U.A., 5.71%, 01/21/33 1.3%
Fair Isaac Corp., 6.00%, 05/15/33 1.1%
Solventum Corp., 5.60%, 03/23/34 1.0%
Constellation Software, Inc., 5.46%, 02/16/34 1.0%
Sodexo, Inc., 5.80%, 08/15/35 1.0%
Vulcan Materials Co., 3.85%, 05/01/26 1.0%
Morgan Stanley, 5.25%, 04/21/34 1.0%
Raymond James Financial, Inc., 4.90%, 09/11/35 0.9%
Roper Technologies, Inc., 4.90%, 10/15/34 0.9%
Material Fund Change [Text Block]
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FIIG or upon request at 1-800-621-1675 or info@ftportfolios.com.
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.49%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Material Fund Change Expenses [Text Block]
Effective February 1, 2026, the Board of Trustees has approved a permanent contractual reduction of the annual unitary management fee for the Fund. The annual unitary management fee for the Fund is now 0.49%. Additionally, under the Fund’s new fee structure, the Fund will not be eligible for any breakpoint discounts described in the Fund’s prospectus or statement of additional information.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since November 1, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FIIG 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/FIIG
C000243959 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest SMID Rising Dividend Achievers Target Income ETF
Class Name FT Vest SMID Rising Dividend Achievers Target Income ETF
Trading Symbol SDVD
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest SMID Rising Dividend Achievers Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/SDVD. 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/SDVD
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 SMID Rising Dividend Achievers Target Income ETF $45 0.85%(1)
(1)
Annualized.
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.85% [24]
Net Assets $ 834,622,758
Holdings Count | Holding 169
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $834,622,758
Total number of portfolio holdings 169
Portfolio turnover rate 21%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
Common Stocks 99.9%
Money Market Funds 0.2%
Written Options (0.1%)
Net Other Assets and Liabilities (0.0%)
Total 100.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
C000243963 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Technology Dividend Target Income ETF
Class Name FT Vest Technology Dividend Target Income ETF
Trading Symbol TDVI
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest Technology Dividend Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/TDVI. 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/TDVI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 Technology Dividend Target Income ETF $39 0.75%(1)
(1)
Annualized.
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.75% [25]
Net Assets $ 417,894,082
Holdings Count | Holding 96
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $417,894,082
Total number of portfolio holdings 96
Portfolio turnover rate 16%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
Common Stocks 99.9%
Money Market Funds 0.2%
Written Options (0.1%)
Net Other Assets and Liabilities 0.0%
Total 100.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
C000248088 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Dow Jones Internet & Target Income ETF
Class Name FT Vest Dow Jones Internet & Target Income ETF
Trading Symbol FDND
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest Dow Jones Internet & Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FDND. 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/FDND
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 Dow Jones Internet & Target Income ETF $36 0.75%(1)
(1)
Annualized.
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.75% [26]
Net Assets $ 9,595,375
Holdings Count | Holding 43
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $9,595,375
Total number of portfolio holdings 43
Portfolio turnover rate 11%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
Common Stocks 99.3%
Money Market Funds 0.1%
Written Options (0.1%)
Net Other Assets and Liabilities 0.7%
Total 100.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
C000256813 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest High Yield & Target Income ETF
Class Name FT Vest High Yield & Target Income ETF
Trading Symbol HYTI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest High Yield & Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/HYTI. 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/HYTI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 High Yield & Target Income ETF $33 0.65%(1)
(1)
Annualized.
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.65% [27]
Net Assets $ 82,318,235
Holdings Count | Holding 6
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $82,318,235
Total number of portfolio holdings 6
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
U.S. Treasury Bills 1.8%
Money Market Funds 1.1%
Purchased Options 96.3%
Written Options (0.0%)
Net Other Assets and Liabilities 0.8%
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
C000256815 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Investment Grade & Target Income ETF
Class Name FT Vest Investment Grade & Target Income ETF
Trading Symbol LQTI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest Investment Grade & Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/LQTI. 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/LQTI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 Investment Grade & Target Income ETF $32 0.65%(1)
(1)
Annualized.
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65% [28]
Net Assets $ 276,091,235
Holdings Count | Holding 6
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $276,091,235
Total number of portfolio holdings 6
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
U.S. Treasury Bills 1.3%
Money Market Funds 1.1%
Purchased Options 96.9%
Written Options (0.0%)
Net Other Assets and Liabilities 0.7%
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
C000256817 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest 20+ Year Treasury & Target Income ETF
Class Name FT Vest 20+ Year Treasury & Target Income ETF
Trading Symbol LTTI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest 20+ Year Treasury & Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/LTTI. 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/LTTI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 20+ Year Treasury & Target Income ETF $32 0.65%(1)
(1)
Annualized.
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65% [29]
Net Assets $ 13,847,279
Holdings Count | Holding 6
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $13,847,279
Total number of portfolio holdings 6
Portfolio turnover rate 0%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund.
Fund Allocation
U.S. Treasury Bills 1.1%
Money Market Funds 1.2%
Purchased Options 97.0%
Written Options (0.0%)
Net Other Assets and Liabilities 0.7%
Total 100.0%
Any amount shown as 0.0% represents less than 0.1%.
C000257988 [Member]  
Shareholder Report [Line Items]  
Fund Name FT Vest Growth Strength & Target Income ETF
Class Name FT Vest Growth Strength & Target Income ETF
Trading Symbol FGSI
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the FT Vest Growth Strength & Target Income ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FGSI. 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/FGSI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(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 Growth Strength & Target Income ETF $42 0.85%(1)
(1)
Annualized.
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.85% [30]
Net Assets $ 2,991,766
Holdings Count | Holding 52
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of April 30, 2026)
Fund net assets $2,991,766
Total number of portfolio holdings 52
Portfolio turnover rate 54%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of April 30, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of net assets and percentage of total investments, respectively, of the Fund.
Fund Allocation
Common Stocks 99.9%
Money Market Funds 0.1%
Written Options (0.1%)
Net Other Assets and Liabilities 0.1%
Total 100.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
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Excludes any Acquired Fund Fees and Expenses of the underlying investment companies in which the Fund invests.
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