Shareholder Report |
12 Months Ended | |||||||||||||||||||||||||||||||||||||
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Mar. 31, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Document Type | N-CSR | |||||||||||||||||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||||||||||||||||
| Registrant Name | First Trust Exchange-Traded Fund VI | |||||||||||||||||||||||||||||||||||||
| Entity Central Index Key | 0001552740 | |||||||||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||||||||||||||||
| Document Period End Date | Mar. 31, 2026 | |||||||||||||||||||||||||||||||||||||
| C000169744 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Nasdaq Bank ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Nasdaq Bank ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTXO | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Bank ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTXO. 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/FTXO | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 68 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [1] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 21.39% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the Nasdaq US Benchmark Banks™ Index, which returned 22.70% for the same Period. During the Period, the Fund allocated investments between two sub-industries. Diversified Banks received an average weight of 50.6% and contributed 13.4% to the Fund’s overall return, while Regional Banks received an average weight of 49.0% and contributed 8.6% to the Fund’s overall return.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 20, 2016 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Sep. 20, 2016 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTXO for more recent performance information.
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| Net Assets | $ 323,635,179 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 50 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,869,379 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 49.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000169745 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Nasdaq Food & Beverage ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Nasdaq Food & Beverage ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTXG | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Food & Beverage ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTXG. 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/FTXG | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 60 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [2] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned -3.64% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the Nasdaq US Benchmark Food, Beverage and Tobacco™ Index, which returned 4.24% for the same Period. During the Period, investments in the Food Products industry received the greatest allocation of any industry, with an average weight of 59.3%, and contributed -4.2% to the Fund’s overall return, the largest negative contribution of any industry. With an average weight of 5.5%, investments in the Chemicals industry contributed 1.5% to the Fund’s overall return, the largest positive contribution of any industry.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 20, 2016 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Sep. 20, 2016 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTXG for more recent performance information.
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| Net Assets | $ 18,810,565 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 32 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 135,047 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000169746 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Nasdaq Oil & Gas ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Nasdaq Oil & Gas ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTXN | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Oil & Gas ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTXN. 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/FTXN | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 70 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [3] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 31.05% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the Nasdaq US Benchmark Energy™ Index, which returned 36.72% for the same Period. During the Period, investments in the Oil & Gas Exploration & Production sub-industry received the greatest allocation of any sub-industry, with an average weight of 41.6%, and contributed 11.8% to the Fund’s overall return, the largest positive contribution of any sub-industry. No industry made a negative contribution to the Fund’s overall return.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 20, 2016 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Sep. 20, 2016 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTXN for more recent performance information.
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| Net Assets | $ 179,657,478 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 45 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 718,178 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 30.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments (excluding repurchase agreements held as collateral for securities lending arrangements) of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000169747 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Nasdaq Pharmaceuticals ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Nasdaq Pharmaceuticals ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTXH | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Pharmaceuticals ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTXH. 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/FTXH | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 69 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [4] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 26.44% during the 12 months ended March 31, 2026. The Fund outperformed its benchmark, the Nasdaq US Benchmark Pharmaceuticals™ Index, which returned 20.04% for the same Period. During the Period, the Fund allocated over 90% of its assets across 2 industries: Pharmaceuticals and Biotechnology. Investments in the Pharmaceuticals industry received the greatest allocation of any industry, with an average weight of 47.5%, and contributed 10.4% to the Fund’s overall return. With an average weight of 43.8%, investments in the Biotechnology industry contributed 12.3% to the Fund’s overall return, the largest positive contribution of any industry. No industry made a negative contribution to the Fund’s overall return.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 20, 2016 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Sep. 20, 2016 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTXH for more recent performance information.
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| Net Assets | $ 29,175,335 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 51 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 114,842 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 35.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000169748 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust S-Network E-Commerce ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust S-Network E-Commerce ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | ISHP | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust S-Network E-Commerce ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/ISHP. 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/ISHP | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 59 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [5] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned -7.01% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the MSCI ACWI Index, which returned 20.01% for the same Period.
During the Period, investments in the Consumer Discretionary sector received the greatest allocation of any sector, with an average weight of 38.0%, and contributed -1.9% to the Fund’s overall return. With average weights of 13.3% and 5.4%, respectively, investments in the Industrials and Consumer Staples sectors each contributed 1.4% to the Fund’s overall return, the largest positive contributions of any sectors. Investments in the Financials sector contributed -4.1% to the Fund’s overall return, the largest negative contribution of any sector, and held an average weight of 9.2%. The Fund’s currency exposure contributed 1.1% to the Fund’s overall return.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
FUND PERFORMANCE (September 20, 2016 to March 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
|
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| Average Annual Return [Table Text Block] |
|
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| Performance Inception Date | Sep. 20, 2016 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed [Text Block] | On January 26, 2022, the Fund’s underlying index changed from the Nasdaq US Smart RetailTM Index to the S-Network Global E-Commerce IndexTM. Therefore, performance and historical returns shown for the periods prior to January 26, 2022, are not necessarily indicative of the performance that the Fund, based on its current index, would have generated. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/ISHP for more recent performance information.
|
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| Net Assets | $ 4,989,041 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 61 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 35,521 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 41.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of March 31, 2026)
|
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| Holdings [Text Block] |
WHAT DID THE FUND INVEST IN? (As of March 31, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Sector Allocation
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| Largest Holdings [Text Block] |
Top Ten Holdings
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| C000169749 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Nasdaq Semiconductor ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Nasdaq Semiconductor ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTXL | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Semiconductor ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTXL. 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/FTXL | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 89 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 95.77% during the 12 months ended March 31, 2026. The Fund outperformed its benchmark, the Nasdaq US Benchmark Semiconductors™ Index, which returned 67.20% for the same Period. During the Period, investments in the Semiconductors sub-industry received the greatest allocation of any sub-industry, with an average weight of 72.2%, and contributed 61.9% to the Fund’s overall return, the largest positive contribution of any sub-industry. No sub-industry made a negative contribution to the Fund’s overall return.
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 20, 2016 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Sep. 20, 2016 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTXL for more recent performance information.
|
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| Net Assets | $ 1,484,597,387 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 35 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 4,323,980 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 43.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000169750 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Nasdaq Transportation ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Nasdaq Transportation ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTXR | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Transportation ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTXR. 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/FTXR | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 69 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 30.11% during the 12 months ended March 31, 2026. The Fund outperformed its benchmark, the Nasdaq US Benchmark Industrial Transportation™ Index, which returned 22.98% for the same Period.
During the Period, investments in the Automobiles industry received the greatest allocation of any industry, with an average weight of 26.3%, and contributed 10.7% to the Fund’s overall return, the largest positive contribution of any industry. Investments in the Distributors industry contributed
-0.4% to the Fund’s overall return, the largest negative contribution of any industry, and held an average weight of 2.4%. |
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
FUND PERFORMANCE (September 20, 2016 to March 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
|
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| Average Annual Return [Table Text Block] |
|
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| Performance Inception Date | Sep. 20, 2016 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/FTXR for more recent performance information.
|
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| Net Assets | $ 838,998,003 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 45 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 593,943 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 70.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of March 31, 2026)
|
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| Holdings [Text Block] |
WHAT DID THE FUND INVEST IN? (As of March 31, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments (excluding repurchase agreements held as collateral for securities lending arrangements) of the Fund.
Top Ten Holdings
Sector Allocation
|
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| Largest Holdings [Text Block] |
Top Ten Holdings
|
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| C000190378 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | Emerging Markets Equity Select ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | Emerging Markets Equity Select ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | RNEM | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Emerging Markets Equity Select ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RNEM. 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/RNEM | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 79 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.76% | [6] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.75%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.75% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 7.96% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the Nasdaq Emerging Large Mid Cap™ Index, which returned 20.88% for the same Period. During the Period, investments in India received the greatest allocation of any country, with an average weight of 36.3%, and contributed -3.2% to the Fund’s overall return, the largest negative contribution of any country. With an average weight of 8.6%, investments in Brazil contributed 3.8% to the Fund’s overall return, the largest positive contribution of any country. The Fund’s currency exposure contributed -1.0% to the Fund’s overall return.
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (June 20, 2017 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
|
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| Performance Inception Date | Jun. 20, 2017 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/RNEM for more recent performance information.
|
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| Net Assets | $ 16,227,259 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 278 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 124,636 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 64.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
|
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000190379 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Bloomberg ShareholderYield ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Bloomberg ShareholderYield ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | SHRY | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Bloomberg Shareholder Yield ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/SHRY. 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/SHRY | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
|
|||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 64 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [7] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 9.15% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 17.80% for the same Period.
During the Period, investments in the Financials sector received the greatest allocation of any sector, with an average weight of 21.6%, and contributed -3.6% to the Fund’s overall return, the largest negative contribution of any sector. With an average weight of 9.4%, investments in the Energy sector contributed 5.6% to the Fund’s overall return, the largest positive contribution of any sector.
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
FUND PERFORMANCE (June 20, 2017 to March 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
|
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| Average Annual Return [Table Text Block] |
|
|||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Jun. 20, 2017 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed [Text Block] | On March 4, 2024, the Fund’s underlying index changed from the Nasdaq Riskalyze US Large CapTM Index to the Bloomberg Shareholder Yield Index. Therefore, any Fund performance and historical returns shown above that incorporate Fund performance prior to March 4, 2024, reflect performance of the Fund based on the Nasdaq Riskalyze US Large CapTM Index and are not necessarily indicative of the performance that the Fund, based on the Bloomberg Shareholder Yield Index, would have generated. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/SHRY for more recent performance information.
|
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| Net Assets | $ 17,395,897 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 52 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 104,672 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 149.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of March 31, 2026)
|
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| Holdings [Text Block] |
WHAT DID THE FUND INVEST IN? (As of March 31, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Sector Allocation
|
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| Largest Holdings [Text Block] |
Top Ten Holdings
|
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| C000190380 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust SMID Capital Strength ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust SMID Capital Strength ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FSCS | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust SMID Capital Strength ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FSCS. 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/FSCS | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 62 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [8] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 2.92% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the Russell 3000® Index, which returned 18.09% for the same Period.
During the Period, investments in the Financials sector received the greatest allocation of any sector, with an average weight of 30.0%, and contributed 1.1% to the Fund’s overall return. With an average weight of 28.7%, investments in the Industrials sector contributed 1.9% to the Fund’s overall return, the largest positive contribution of any sector. Investments in the Health Care sector contributed -0.4% to the Fund’s overall return, the largest negative contribution of any sector, and held an average weight of 6.0%.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
FUND PERFORMANCE (June 20, 2017 to March 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
|
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Jun. 20, 2017 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed [Text Block] | On June 7, 2024, the Fund’s underlying index changed from the Nasdaq Riskalyze US Mid CapTM Index to The SMID Capital Strength Index. Therefore, the Fund’s performance and historical returns shown for the periods prior to this date are not necessarily indicative of the performance that the Fund, based on its current index, would have generated. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/FSCS for more recent performance information.
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| Net Assets | $ 56,332,976 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 101 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 288,267 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 123.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] |
WHAT DID THE FUND INVEST IN? (As of March 31, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Sector Allocation
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| Largest Holdings [Text Block] |
Top Ten Holdings
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| C000190381 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust SMID Growth Strength ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust SMID Growth Strength ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FSGS | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust SMID Growth Strength ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FSGS. 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/FSGS | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 63 | [9] | ||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [9],[10] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 6.68% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the Russell 3000® Index, which returned 18.09% for the same Period. During the Period, investments in the Industrials sector received the greatest allocation of any sector, with an average weight of 26.0%, and contributed 5.9% to the Fund’s overall return, the largest positive contribution of any sector. Investments in the Information Technology sector contributed -2.1% to the Fund’s overall return, the largest negative contribution of any sector, and held an average weight of 12.0%.
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (June 20, 2017 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Jun. 20, 2017 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed [Text Block] | On December 3, 2024, the Fund’s underlying index changed from the Nasdaq Riskalyze US Small CapTM Index to The SMID Growth Strength Index. Therefore, the Fund’s performance and historical returns shown for the periods prior to this date are not necessarily indicative of the performance that the Fund, based on its current index, would have generated. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/FSGS for more recent performance information.
|
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| Net Assets | $ 27,758,169 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 102 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 176,199 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 135.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments (excluding repurchase agreements held as collateral for securities lending arrangements) of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000190382 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust S&P 500 DiversifiedDividend Aristocrats ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust S&P 500 DiversifiedDividend Aristocrats ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | KNGZ | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust S&P 500 Diversified Dividend Aristocrats ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/KNGZ. 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/KNGZ | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 55 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.51% | [11] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.50%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.50% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 15.20% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 17.80% for the same Period.
During the Period, investments in the Information Technology sector received the greatest allocation of any sector, with an average weight of 33.6%, and contributed 10.4% to the Fund’s overall return, the largest positive contribution of any sector. Investments in the Consumer Staples sector contributed -0.8% to the Fund’s overall return, the largest negative contribution of any sector, and held an average weight of 5.2%.
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
FUND PERFORMANCE (June 20, 2017 to March 31, 2026)
The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods.
Investment Performance of $10,000
|
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| Average Annual Return [Table Text Block] |
|
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| Performance Inception Date | Jun. 20, 2017 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed [Text Block] | On October 3, 2023, the Fund’s underlying index changed from the Nasdaq Riskalyze US Large Cap Select DividendTM Index to the S&P 500® Sector-Neutral Dividend Aristocrats Index. Therefore, the Fund’s performance and historical returns shown for the periods prior to this date are not necessarily indicative of the performance that the Fund, based on its current index, would have generated. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/KNGZ for more recent performance information.
|
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| Net Assets | $ 55,888,100 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 101 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 262,923 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 46.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of March 31, 2026)
|
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| Holdings [Text Block] |
WHAT DID THE FUND INVEST IN? (As of March 31, 2026)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Sector Allocation
|
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| Largest Holdings [Text Block] |
Top Ten Holdings
|
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| C000227379 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust S-Network Streaming & Gaming ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust S-Network Streaming & Gaming ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | BNGE | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust S-Network Streaming & Gaming ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/BNGE. 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/BNGE | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 73 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.71% | [12] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.70%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.70% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 4.69% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the MSCI ACWI Index, which returned 20.01% for the same Period. During the Period, investments in the United States received the greatest allocation of any country, with an average weight of 44.8%, and contributed 13.0% to the Fund’s overall return, the largest positive contribution of any country. Investments in Ireland contributed -2.7% to the Fund’s overall return, the largest negative contribution of any country, and held an average weight of 3.9%. The Fund’s currency exposure contributed -0.2% to the Fund’s overall return.
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (January 25, 2022 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Jan. 25, 2022 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/BNGE for more recent performance information.
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| Net Assets | $ 4,557,883 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 47 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 48,067 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 27.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments (excluding repurchase agreements held as collateral for securities lending arrangements) of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000227613 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Indxx Medical Devices ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Indxx Medical Devices ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | MDEV | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | CboeBZX | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Indxx Medical Devices ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/MDEV. 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/MDEV | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 69 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.71% | [13] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.70%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.70% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned -5.46% during the 12 months ended March 31, 2026. The Fund underperformed its benchmark, the MSCI World Health Care Index, which returned 4.23% for the same Period. During the Period, investments in the United States received the greatest allocation of any country, with an average weight of 58.4%, and contributed -0.6% to the Fund’s overall return. With an average weight of 2.6%, investments in China contributed 1.4% to the Fund’s overall return, the largest positive contribution of any country. Investments in Germany contributed -1.6% to the Fund’s overall return, the largest negative contribution of any country, and held an average weight of 3.7%. The Fund’s currency exposure contributed 1.4% to the Fund’s overall return.
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (June 22, 2021 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Jun. 22, 2021 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/MDEV for more recent performance information.
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| Net Assets | $ 1,905,994 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 50 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 14,281 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 20.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000248907 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Bloomberg R&D Leaders ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Bloomberg R&D Leaders ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | RND | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Bloomberg R&D Leaders ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RND. 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/RND | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 68 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [14] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 21.52% during the 12 months ended March 31, 2026. The Fund outperformed its benchmark, the S&P 500® Index, which returned 17.80% for the same Period. During the Period, investments in the Information Technology sector received the greatest allocation of any sector, with an average weight of 42.6%, and contributed 15.7% to the Fund’s overall return, the largest positive contribution of any sector. Investments in the Health Care sector contributed
-0.6% to the Fund’s overall return, the largest negative contribution of any sector, and held an average weight of 17.5%. |
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (April 30, 2024 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Apr. 30, 2024 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/RND for more recent performance information.
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| Net Assets | $ 4,108,110 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 50 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 20,765 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 46.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000251153 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust New Constructs Core Earnings Leaders ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust New Constructs Core Earnings Leaders ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTCE | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust New Constructs Core Earnings Leaders ETF (the “Fund”) for the year of April 1, 2025 to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTCE. 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/FTCE | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 67 | |||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.61% | [15] | ||||||||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 0.60%. | |||||||||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.60% | |||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 19.82% during the 12 months ended March 31, 2026. The Fund outperformed its benchmark, the S&P 500® Index, which returned 17.80% for the same Period. During the Period, investments in the Information Technology sector received the greatest allocation of any sector, with an average weight of 34.2%, and contributed 14.7% to the Fund’s overall return, the largest positive contribution of any sector. Investments in the Financials sector contributed
-1.7% to the Fund’s overall return, the largest negative contribution of any sector, and held an average weight of 13.0%. |
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (October 2, 2024 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | Oct. 02, 2024 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTCE for more recent performance information.
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| Net Assets | $ 63,855,616 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 101 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 307,669 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 110.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
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| Largest Holdings [Text Block] | Top Ten Holdings
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| C000259078 [Member] | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Fund Name | First Trust Balanced Income ETF | |||||||||||||||||||||||||||||||||||||
| Class Name | First Trust Balanced Income ETF | |||||||||||||||||||||||||||||||||||||
| Trading Symbol | FTBI | |||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Balanced Income ETF (the “Fund”) for the period of May 28, 2025 (commencement of investment operations) to March 31, 2026 (the “Period”). | |||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTBI. 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/FTBI | |||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 22 | [16],[17] | ||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.25% | [16],[18] | ||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund’s inception date was May 28, 2025. The Fund returned 11.34% since its inception through March 31, 2026. The Fund underperformed its benchmark, the S&P 500® Index, which returned 12.03% for the same Period. During the Period, the Fund allocated investments across 14 ETFs. FTHI received the greatest allocation in the Fund, with an average weight of 19.8%, and contributed 2.3% to the Fund’s overall return, the largest positive contribution of any investment. No single investment represented a negative contribution to the Fund’s overall return. Investments in the Information Technology sector received the greatest allocation of any sector, with an average weight of 21.5%, and contributed 4.0% to the Fund’s overall return, the largest positive contribution of any sector. No sector made a negative contribution to the Fund’s overall return.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (May 28, 2025 to March 31, 2026) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
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| Average Annual Return [Table Text Block] |
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| Performance Inception Date | May 28, 2025 | |||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTBI for more recent performance information.
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| Net Assets | $ 18,766,819 | |||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 14 | |||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 23,294 | |||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 5.00% | |||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of March 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of March 31, 2026) The table below shows the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
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| Largest Holdings [Text Block] | Top Ten Holdings
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