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Shareholder Report
 6 Months Ended
Jan. 31, 2025
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 Jan. 31, 2025
C000246109 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Core Investment Grade ETF
Class Name First Trust Core Investment Grade ETF
Trading Symbol FTCB
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Core Investment Grade ETF (the “Fund”) for the period of August 1, 2024 to January 31, 2025.
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/FTCB. 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/FTCB
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 Core Investment Grade ETF $28(1) 0.55%(1) (2)
​(1)
Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.
​(2)
Annualized.
Expenses Paid, Amount $ 28 [1]
Expense Ratio, Percent 0.55% [1],[2]
Net Assets $ 526,490,950
Holdings Count | Holding 457
Investment Company Portfolio Turnover 98.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of January 31, 2025)
Fund net assets $526,490,950
Total number of portfolio holdings 457
Portfolio turnover rate 98%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of January 31, 2025)
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 38.5%
Corporate Bonds and Notes 20.7%
Mortgage-Backed Securities 16.4%
U.S. Government Bonds and Notes 16.1%
Asset-Backed Securities 6.7%
Foreign Corporate Bonds and Notes 4.2%
Money Market Funds 2.0%
Purchased Options 0.0%
U.S. Government Agency Mortgage-Backed Securities Sold Short (0.8%)
Written Options (0.2%)
Net Other Assets and Liabilities(1) (3.6%)
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.
C000248162 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Commercial Mortgage Opportunities ETF
Class Name First Trust Commercial Mortgage Opportunities ETF
Trading Symbol CAAA
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Commercial Mortgage Opportunities ETF (the “Fund”) for the period of August 1, 2024 to January 31, 2025.
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/CAAA. 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/CAAA
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 Commercial Mortgage Opportunities ETF $28 0.55%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55% [3]
Net Assets $ 15,163,434
Holdings Count | Holding 56
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of January 31, 2025)
Fund net assets $15,163,434
Total number of portfolio holdings 56
Portfolio turnover rate 24%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of January 31, 2025)
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
Mortgage-Backed Securities 97.3%
U.S. Government Agency Mortgage-Backed Securities 1.0%
Money Market Funds 4.5%
Net Other Assets and Liabilities(1) (2.8%)
Total 100.0%
Credit Quality (2)
Graphical Representation - Allocation 2 Chart
(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.
C000248350 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Structured Credit Income Opportunities ETF
Class Name First Trust Structured Credit Income Opportunities ETF
Trading Symbol SCIO
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Structured Credit Income Opportunities ETF (the “Fund”) for the period of August 1, 2024 to January 31, 2025.
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/SCIO. 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/SCIO
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 Structured Credit Income Opportunities ETF $49 0.95%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.95% [4]
Net Assets $ 15,224,212
Holdings Count | Holding 61
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of January 31, 2025)
Fund net assets $15,224,212
Total number of portfolio holdings 61
Portfolio turnover rate 30%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of January 31, 2025)
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
Mortgage-Backed Securities 75.2%
Asset-Backed Securities 17.0%
U.S. Government Agency Mortgage-Backed Securities 6.5%
Money Market Funds 0.5%
Net Other Assets and Liabilities(1) 0.8%
Total 100.0%
Credit Quality (2)
Graphical Representation - Allocation 2 Chart
(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.
[1] Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.
[2] Annualized.
[3] Annualized.
[4] Annualized.