| Form N-CSR Cover | 12 Months Ended |
| Dec. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | First Trust Exchange-Traded Fund |
| Entity Central Index Key | 0001329377 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Dec. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Dec. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | First Trust Exchange-Traded Fund |
| Entity Central Index Key | 0001329377 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Dec. 31, 2024 |
| C000029773 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Dow Jones SelectMicroCap Index Fund |
| Class Name | First Trust Dow Jones SelectMicroCap Index Fund |
| Trading Symbol | FDM |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dow Jones Select MicroCap Index Fund (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FDM 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/FDM |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow Jones Select MicroCap Index Fund $ 0.60 % |
| Expenses Paid, Amount | $ 64 |
| 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 12.73% during the 12 months ended December 31, 2024. The Fund outperformed its benchmark, the Russell 2000 ® During the Period, the greatest allocation in the Fund went to securities in the Financials sector. This sector’s average weight in the Fund was 27.2% and contributed 5.1% to the Fund’s overall return. The greatest contribution to the Fund’s return was 6.9% from the allocation to the Industrials sector. The greatest source of drag for the Fund came from investments in the Consumer Discretionary sector, which caused a -2.2% drag in the Fund. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Dow Jones Select MicroCap Index Fund 12.73 % 7.76 % 9.08 % Dow Jones Select MicroCap Index SM 13.43 % 8.60 % 9.82 % Russell 2000 ® 11.54 % 7.40 % 7.82 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/FDM for more recent performance information. |
| Net Assets | $ 177,447,912 |
| Holdings Count | Holding | 143 |
| Advisory Fees Paid, Amount | $ 789,760 |
| Investment Company Portfolio Turnover | 71% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 143 Total advisory fee paid $ Portfolio turnover rate 71 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Turning Point Brands, Inc. 1.8 % Vimeo, Inc. 1.7 % Solaris Energy Infrastructure, Inc. 1.7 % Centrus Energy Corp., Class A 1.7 % Limbach Holdings, Inc. 1.5 % Mizuho Financial Group, Inc. 1.5 % RBC Dominion Securities, Inc. 1.4 % BJ's Restaurants, Inc. 1.4 % Central Pacific Financial Corp. 1.4 % Hackett Group (The), Inc. 1.3 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Turning Point Brands, Inc. 1.8 % Vimeo, Inc. 1.7 % Solaris Energy Infrastructure, Inc. 1.7 % Centrus Energy Corp., Class A 1.7 % Limbach Holdings, Inc. 1.5 % Mizuho Financial Group, Inc. 1.5 % RBC Dominion Securities, Inc. 1.4 % BJ's Restaurants, Inc. 1.4 % Central Pacific Financial Corp. 1.4 % Hackett Group (The), Inc. 1.3 % |
| C000030350 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust MorningstarDividend Leaders Index Fund |
| Class Name | First Trust MorningstarDividend Leaders Index Fund |
| Trading Symbol | FDL |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Morningstar Dividend Leaders Index Fund (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FDL 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/FDL |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Morningstar Dividend Leaders Index Fund $ 0.43 % |
| Expenses Paid, Amount | $ 47 |
| Expense Ratio, Percent | 0.43% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 16.98% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® During the Period, the greatest allocation in the Fund was 19.4% to the Financials sector, which contributed 3.9% to the Fund’s overall return and were greatest source of return for the Fund. The most negative contribution to the Fund’s return came from investments in the Materials sector, which caused a |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Morningstar Dividend Leaders Index Fund 16.98 % 8.90 % 9.55 % Morningstar ® SM 17.49 % 9.45 % 10.10 % S&P 500 ® 25.02 % 14.53 % 13.10 % Russell 1000 ® 14.37 % 8.68 % 8.49 % |
| 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/FDL for more recent performance information. |
| Net Assets | $ 4,451,266,050 |
| Holdings Count | Holding | 96 |
| Advisory Fees Paid, Amount | $ 12,291,397 |
| Investment Company Portfolio Turnover | 46% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 96 Total advisory fee paid $ Portfolio turnover rate 46 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings AbbVie, Inc. 8.4 % Verizon Communications, Inc. 8.2 % Chevron Corp. 7.6 % Pfizer, Inc. 7.5 % Philip Morris International, Inc. 6.0 % Altria Group, Inc. 5.0 % International Business Machines Corp. 4.4 % United Parcel Service, Inc., Class B 3.5 % Gilead Sciences, Inc. 2.9 % Duke Energy Corp. 2.4 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings AbbVie, Inc. 8.4 % Verizon Communications, Inc. 8.2 % Chevron Corp. 7.6 % Pfizer, Inc. 7.5 % Philip Morris International, Inc. 6.0 % Altria Group, Inc. 5.0 % International Business Machines Corp. 4.4 % United Parcel Service, Inc., Class B 3.5 % Gilead Sciences, Inc. 2.9 % Duke Energy Corp. 2.4 % |
| C000030351 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust US Equity Opportunities ETF |
| Class Name | First Trust US Equity Opportunities ETF |
| Trading Symbol | FPX |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust US Equity Opportunities ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FPX 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/FPX |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust US Equity Opportunities ETF $ 0.56 % |
| Expenses Paid, Amount | $ 63 |
| Expense Ratio, Percent | 0.56% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 25.02% during the 12 months ended December 31, 2024. The Fund outperformed its benchmark, the Russell 3000 ® During the Period, the two sectors with the greatest allocation were also the most positive contributors to the Fund’s overall return. The Fund allocated 25.4% to the Industrials sector, which contributed 5.8% to the Fund’s overall return. The Fund also allocated 23.6% to the Information Technology sector, which contributed 12.1% to the Fund’s overall return. The most negative contribution to return came from the Health Care sector, which caused -1.5% drag in the Fund. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust US Equity Opportunities ETF 25.02 % 8.70 % 9.66 % IPOX ® 25.71 % 9.24 % 10.21 % S&P 500 ® 25.02 % 14.53 % 13.10 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/FPX for more recent performance information. |
| Net Assets | $ 783,452,632 |
| Holdings Count | Holding | 103 |
| Advisory Fees Paid, Amount | $ 2,961,296 |
| Investment Company Portfolio Turnover | 77% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 103 Total advisory fee paid $ Portfolio turnover rate 77 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Palantir Technologies, Inc., Class A 6.9 % AppLovin Corp., Class A 6.8 % Carrier Global Corp. 6.4 % Samsara, Inc., Class A 6.1 % DoorDash, Inc., Class A 4.3 % GE Vernova, Inc. 3.8 % Constellation Energy Corp. 3.6 % Kenvue, Inc. 3.0 % Duolingo, Inc. 2.7 % CrowdStrike Holdings, Inc., Class A 2.6 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Palantir Technologies, Inc., Class A 6.9 % AppLovin Corp., Class A 6.8 % Carrier Global Corp. 6.4 % Samsara, Inc., Class A 6.1 % DoorDash, Inc., Class A 4.3 % GE Vernova, Inc. 3.8 % Constellation Energy Corp. 3.6 % Kenvue, Inc. 3.0 % Duolingo, Inc. 2.7 % CrowdStrike Holdings, Inc., Class A 2.6 % |
| C000030477 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust NASDAQ-100Equal Weighted Index Fund |
| Class Name | First Trust NASDAQ-100Equal Weighted Index Fund |
| Trading Symbol | QQEW |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NASDAQ-100 Equal Weighted Index Fund (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/QQEW 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/QQEW |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ-100 Equal Weighted Index Fund $ 0.55 % |
| Expenses Paid, Amount | $ 57 |
| Expense Ratio, Percent | 0.55% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 6.81% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the Nasdaq-100 ® During the Period, the Fund allocated 38.1% to the Information Technology sector, by far the greatest allocation to any sector in the Fund. The Consumer Discretionary sector had the most positive contribution to return of any sector during the Period, with a 2.5% contribution to the Fund’s overall return. The most negative contribution to the Fund’s return came from investments in the Consumer Staples sector, which caused a -1.3% drag in the Fund. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust NASDAQ-100 Equal Weighted Index Fund 6.81 % 11.68 % 11.92 % Nasdaq-100 Equal Weighted TM 7.31 % 12.24 % 12.55 % S&P 500 ® 25.02 % 14.53 % 13.10 % Nasdaq-100 Index ® 25.88 % 20.18 % 18.53 % |
| 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/QQEW for more recent performance information. |
| Net Assets | $ 1,859,605,340 |
| Holdings Count | Holding | 103 |
| Advisory Fees Paid, Amount | $ 8,232,091 |
| Investment Company Portfolio Turnover | 26% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 103 Total advisory fee paid $ Portfolio turnover rate 26 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Diamondback Energy, Inc. 1.1 % Broadcom, Inc. 1.1 % Biogen, Inc. 1.1 % Starbucks Corp. 1.0 % Microchip Technology, Inc. 1.0 % GLOBALFOUNDRIES, Inc. 1.0 % Intel Corp. 1.0 % Coca-Cola Europacific Partners PLC 1.0 % Baker Hughes Co. 1.0 % Exelon Corp. 1.0 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Diamondback Energy, Inc. 1.1 % Broadcom, Inc. 1.1 % Biogen, Inc. 1.1 % Starbucks Corp. 1.0 % Microchip Technology, Inc. 1.0 % GLOBALFOUNDRIES, Inc. 1.0 % Intel Corp. 1.0 % Coca-Cola Europacific Partners PLC 1.0 % Baker Hughes Co. 1.0 % Exelon Corp. 1.0 % |
| C000030478 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust NASDAQ-100-Technology Sector Index Fund |
| Class Name | First Trust NASDAQ-100-Technology Sector Index Fund |
| Trading Symbol | QTEC |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NASDAQ-100-Technology Sector Index Fund (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/QTEC 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/QTEC |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ-100-Technology Sector Index Fund $ 0.54 % |
| Expenses Paid, Amount | $ 56 |
| Expense Ratio, Percent | 0.54% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 7.12% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® The largest industry allocations during the Period were the Semiconductors & Semiconductor Equipment industry at 42.3% and the Software industry at 37.4%. They contributed 3.3% and 2.7%, respectively, to the Fund’s return, which were the largest contributions to the Fund’s return since the Fund is so concentrated in these two industries. The most negative contribution to the Fund’s return came from investments in the IT Services industry which caused a -0.9% drag in the Fund. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust NASDAQ-100-Technology Sector Index Fund 7.12 % 13.65 % 16.40 % Nasdaq-100 Technology Sector TM 7.72 % 14.32 % 17.11 % S&P 500 ® 25.02 % 14.53 % 13.10 % S&P 500 ® 36.61 % 24.55 % 22.35 % |
| 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/QTEC for more recent performance information. |
| Net Assets | $ 3,806,918,142 |
| Holdings Count | Holding | 48 |
| Advisory Fees Paid, Amount | $ 15,522,440 |
| Investment Company Portfolio Turnover | 28% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 48 Total advisory fee paid $ Portfolio turnover rate 28 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Broadcom, Inc. 2.4 % Microchip Technology, Inc. 2.4 % GLOBALFOUNDRIES, Inc. 2.4 % Intel Corp. 2.4 % Advanced Micro Devices, Inc. 2.3 % Lam Research Corp. 2.3 % QUALCOMM, Inc. 2.3 % Texas Instruments, Inc. 2.3 % Analog Devices, Inc. 2.3 % KLA Corp. 2.3 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. |
| Largest Holdings [Text Block] | Top Ten Holdings Broadcom, Inc. 2.4 % Microchip Technology, Inc. 2.4 % GLOBALFOUNDRIES, Inc. 2.4 % Intel Corp. 2.4 % Advanced Micro Devices, Inc. 2.3 % Lam Research Corp. 2.3 % QUALCOMM, Inc. 2.3 % Texas Instruments, Inc. 2.3 % Analog Devices, Inc. 2.3 % KLA Corp. 2.3 % |
| C000033929 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust NYSE® Arca®Biotechnology Index Fund |
| Class Name | First Trust NYSE® Arca®Biotechnology Index Fund |
| Trading Symbol | FBT |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NYSE ® ® |
| 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/FBT 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/FBT |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NYSE ® ® $ 0.54 % |
| Expenses Paid, Amount | $ 56 |
| Expense Ratio, Percent | 0.54% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 5.76% during the 12 months ended December 31, 2024. The Fund outperformed its benchmark, the S&P Composite 1500 ® During the Period, the Fund was highly concentrated in the Biotechnology industry, which received a 76.2% allocation in the Fund. However, the investments in the Pharmaceuticals industry contributed 3.9% to the Fund’s overall return, the most of any industry. Investments in the Life Sciences Tools & Services industry contributed -1.1% to the Fund’s return, and was the only industry with a negative return. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust NYSE ® ® 5.76 % 2.34 % 5.07 % NYSE ® ® 6.28 % 2.83 % 5.58 % S&P Composite 1500 ® 2.81 % 7.70 % 9.18 % Nasdaq ® -0.57 % 3.40 % 3.72 % S&P 500 ® 25.02 % 14.53 % 13.10 % |
| 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/FBT for more recent performance information. |
| Net Assets | $ 1,111,743,523 |
| Holdings Count | Holding | 31 |
| Advisory Fees Paid, Amount | $ 4,666,445 |
| Investment Company Portfolio Turnover | 71% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 31 Total advisory fee paid $ Portfolio turnover rate 71 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Exelixis, Inc. 4.4 % ACADIA Pharmaceuticals, Inc. 4.2 % Natera, Inc. 4.2 % Neurocrine Biosciences, Inc. 4.1 % Argenx SE, ADR 3.9 % Corcept Therapeutics, Inc. 3.8 % Intra-Cellular Therapies, Inc. 3.8 % Gilead Sciences, Inc. 3.7 % Incyte Corp. 3.6 % Repligen Corp. 3.6 % Industry Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Exelixis, Inc. 4.4 % ACADIA Pharmaceuticals, Inc. 4.2 % Natera, Inc. 4.2 % Neurocrine Biosciences, Inc. 4.1 % Argenx SE, ADR 3.9 % Corcept Therapeutics, Inc. 3.8 % Intra-Cellular Therapies, Inc. 3.8 % Gilead Sciences, Inc. 3.7 % Incyte Corp. 3.6 % Repligen Corp. 3.6 % |
| C000033930 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Dow Jones Internet Index Fund |
| Class Name | First Trust Dow Jones Internet Index Fund |
| Trading Symbol | FDN |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dow Jones Internet Index Fund (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FDN 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/FDN |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow Jones Internet Index Fund $ 0.49 % |
| Expenses Paid, Amount | $ 56 |
| Expense Ratio, Percent | 0.49% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 30.52% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P Composite 1500 ® During the Period, the Information Technology sector received the greatest allocation in the Fund with a 39.4% average weight. The allocation to this sector contributed 7.4% to the Fund’s return. The largest contribution to the Fund’s return came from the Communication Services sector, which had an average weight of 30.8% and contributed 12.6% to return. The only negatively contributing sector to the Fund’s return was the Health Care sector, which contributed -0.3%. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Dow Jones Internet Index Fund 30.52 % 11.84 % 14.79 % Dow Jones Internet Composite Index SM 31.12 % 12.41 % 15.40 % S&P 500 ® 25.02 % 14.53 % 13.10 % S&P Composite 1500 ® 35.93 % 24.06 % 21.94 % |
| 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/FDN for more recent performance information. |
| Net Assets | $ 6,803,638,493 |
| Holdings Count | Holding | 44 |
| Advisory Fees Paid, Amount | $ 24,052,029 |
| Investment Company Portfolio Turnover | 32% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 44 Total advisory fee paid $ Portfolio turnover rate 32 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Amazon.com, Inc. 10.0 % Meta Platforms, Inc., Class A 9.7 % Netflix, Inc. 8.1 % Salesforce, Inc. 6.8 % Alphabet, Inc., Class A 5.6 % Arista Networks, Inc. 4.9 % Cisco Systems, Inc. 4.8 % Alphabet, Inc., Class C 4.6 % Booking Holdings, Inc. 4.4 % PayPal Holdings, Inc. 3.9 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Amazon.com, Inc. 10.0 % Meta Platforms, Inc., Class A 9.7 % Netflix, Inc. 8.1 % Salesforce, Inc. 6.8 % Alphabet, Inc., Class A 5.6 % Arista Networks, Inc. 4.9 % Cisco Systems, Inc. 4.8 % Alphabet, Inc., Class C 4.6 % Booking Holdings, Inc. 4.4 % PayPal Holdings, Inc. 3.9 % |
| C000034137 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Capital Strength® ETF |
| Class Name | First Trust Capital Strength® ETF |
| Trading Symbol | FTCS |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Capital Strength ® |
| 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/FTCS 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/FTCS |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Capital Strength ® $ 0.52 % |
| Expenses Paid, Amount | $ 55 |
| Expense Ratio, Percent | 0.52% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 11.21% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® During the Period, the Fund allocated 20.5% to the Industrials sector, which was the largest sector weight in the Fund. The second highest weight was the Financials sector, which had an average weight of 18.7%. The Financials sector contributed 4.1% to the Fund’s return, which was the largest positive return contribution of any sector. The Energy sector contributed -0.5% to return, which was the largest detractor to the Fund’s return. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Capital Strength ® 11.21 % 9.17 % 10.16 % S&P 500 ® 25.02 % 14.53 % 13.10 % The Capital Strength Index TM 11.81 % 9.81 % 10.83 % |
| 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/FTCS for more recent performance information. |
| Net Assets | $ 8,581,233,143 |
| Holdings Count | Holding | 51 |
| Advisory Fees Paid, Amount | $ 42,884,298 |
| Investment Company Portfolio Turnover | 87% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 51 Total advisory fee paid $ Portfolio turnover rate 87 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Walmart, Inc. 2.3 % Visa, Inc., Class A 2.3 % Cisco Systems, Inc. 2.2 % Snap-on, Inc. 2.2 % Costco Wholesale Corp. 2.2 % TJX (The) Cos., Inc. 2.2 % Packaging Corp. of America 2.2 % Mastercard, Inc., Class A 2.1 % Blackrock, Inc. 2.1 % Ameriprise Financial, Inc. 2.1 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Walmart, Inc. 2.3 % Visa, Inc., Class A 2.3 % Cisco Systems, Inc. 2.2 % Snap-on, Inc. 2.2 % Costco Wholesale Corp. 2.2 % TJX (The) Cos., Inc. 2.2 % Packaging Corp. of America 2.2 % Mastercard, Inc., Class A 2.1 % Blackrock, Inc. 2.1 % Ameriprise Financial, Inc. 2.1 % |
| C000035622 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust NASDAQ-100 Ex-Technology Sector Index Fund |
| Class Name | First Trust NASDAQ-100 Ex-Technology Sector Index Fund |
| Trading Symbol | QQXT |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NASDAQ-100 Ex-Technology Sector Index Fund (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/QQXT 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/QQXT |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ-100 Ex-Technology Sector Index Fund $ 0.60 % |
| Expenses Paid, Amount | $ 62 |
| 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 6.73% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the Russell 1000 ® During the Period, the Fund allocated 20.0% to the Health Care sector, the largest of any sector. The largest contribution to the Fund’s return came from the Consumer Discretionary sector at 3.8%. The largest drag on the Fund’s return came from the Consumer Staples sector, which caused a |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust NASDAQ-100 Ex-Technology Sector Index Fund 6.73 % 10.63 % 9.50 % Nasdaq-100 Ex-Tech Sector TM 7.19 % 11.15 % 10.09 % Russell 1000 ® 24.51 % 14.28 % 12.87 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/QQXT for more recent performance information. |
| Net Assets | $ 111,827,843 |
| Holdings Count | Holding | 57 |
| Advisory Fees Paid, Amount | $ 530,656 |
| Investment Company Portfolio Turnover | 27% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 57 Total advisory fee paid $ Portfolio turnover rate 27 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Diamondback Energy, Inc. 1.9 % Biogen, Inc. 1.9 % Starbucks Corp. 1.9 % Coca-Cola Europacific Partners PLC 1.8 % Baker Hughes Co. 1.8 % Exelon Corp. 1.8 % Monster Beverage Corp. 1.8 % Regeneron Pharmaceuticals, Inc. 1.8 % Ross Stores, Inc. 1.8 % Vertex Pharmaceuticals, Inc. 1.8 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Diamondback Energy, Inc. 1.9 % Biogen, Inc. 1.9 % Starbucks Corp. 1.9 % Coca-Cola Europacific Partners PLC 1.8 % Baker Hughes Co. 1.8 % Exelon Corp. 1.8 % Monster Beverage Corp. 1.8 % Regeneron Pharmaceuticals, Inc. 1.8 % Ross Stores, Inc. 1.8 % Vertex Pharmaceuticals, Inc. 1.8 % |
| C000037851 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Dividend StrengthTM ETF |
| Class Name | First Trust Dividend StrengthTM ETF |
| Trading Symbol | FTDS |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dividend Strength TM |
| 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/FTDS 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/FTDS |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dividend Strength TM $ 0.70 % |
| Expenses Paid, Amount | $ 74 |
| Expense Ratio, Percent | 0.70% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 11.09% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the Dow Jones U.S. Select Dividend Index, which returned 16.62% for the same Period. During the Period, the Financials sector was the largest sector allocation by average weight at 30.4%. The largest contribution to the Fund’s return was also the Financials sector, which contributed 10.6%. The largest negative contributor to the Fund’s return was the Consumer Staples sector, which contributed |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Dividend Strength TM 11.09 % 8.79 % 8.33 % The Dividend Strength TM (1) (2) 11.89 % N/A N/A S&P 500 ® 25.02 % 14.53 % 13.10 % Dow Jones U.S. Select Dividend Index 16.62 % 8.86 % 9.38 % Russell 1000 ® 14.37 % 8.68 % 8.49 % (1 ) On April 29, 2022, the Fund’s underlying index changed from the Nasdaq AlphaDEX ® TM (2 ) Because the Fund’s underlying index has an inception date of March 7, 2022, performance data for the Index is not available for all periods shown in the table because performance data does not exist for some of the entire periods. |
| Performance Inception Date | Mar. 07, 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. |
| Performance Table Market Index Changed [Text Block] | On April 29, 2022, the Fund’s underlying index changed from the Nasdaq AlphaDEX ® TM |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTDS for more recent performance information. |
| Net Assets | $ 25,280,278 |
| Holdings Count | Holding | 51 |
| Advisory Fees Paid, Amount | $ 72,572 |
| Investment Company Portfolio Turnover | 104% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 51 Total advisory fee paid $ Portfolio turnover rate 104 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Garmin Ltd. 2.6 % Wyndham Hotels & Resorts, Inc. 2.6 % Unum Group 2.4 % Cullen/Frost Bankers, Inc. 2.3 % Coterra Energy, Inc. 2.3 % Commerce Bancshares, Inc. 2.2 % Home BancShares, Inc. 2.2 % Dick’s Sporting Goods, Inc. 2.2 % East West Bancorp, Inc. 2.2 % Snap-on, Inc. 2.2 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Garmin Ltd. 2.6 % Wyndham Hotels & Resorts, Inc. 2.6 % Unum Group 2.4 % Cullen/Frost Bankers, Inc. 2.3 % Coterra Energy, Inc. 2.3 % Commerce Bancshares, Inc. 2.2 % Home BancShares, Inc. 2.2 % Dick’s Sporting Goods, Inc. 2.2 % East West Bancorp, Inc. 2.2 % Snap-on, Inc. 2.2 % |
| C000037913 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Value Line®Dividend Index Fund |
| Class Name | First Trust Value Line®Dividend Index Fund |
| Trading Symbol | FVD |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Value Line ® |
| 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/FVD 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/FVD |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Value Line ® $ 0.61 % |
| Expenses Paid, Amount | $ 64 |
| Expense Ratio, Percent | 0.61% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 10.00% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® During the Period, the Fund allocated 20.6% to the Industrials sector, which was the largest sector weight in the Fund. Financials, at 3.6%, contributed the most to the Fund’s return of any sector. Investments in the Communication Services sector caused the largest drag of any sector, contributing -0.2%. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Value Line ® 10.00 % 6.26 % 8.50 % Value Line ® 10.74 % 7.08 % 9.35 % S&P 500 ® 25.02 % 14.53 % 13.10 % S&P 500 ® 12.29 % 10.49 % 10.01 % Dow Jones U.S. Select Dividend Index SM 16.62 % 8.86 % 9.38 % |
| 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/FVD for more recent performance information. |
| Net Assets | $ 9,281,568,741 |
| Holdings Count | Holding | 222 |
| Advisory Fees Paid, Amount | $ 47,250,167 |
| Investment Company Portfolio Turnover | 73% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 222 Total advisory fee paid $ Portfolio turnover rate 73 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Toyota Motor Corp., ADR 0.5 % Honda Motor Co., Ltd., ADR 0.5 % Starbucks Corp. 0.5 % Maximus, Inc. 0.5 % Target Corp. 0.5 % Cal-Maine Foods, Inc. 0.5 % America Movil S.A.B. de C.V., ADR 0.5 % Spire, Inc. 0.5 % Southwest Gas Holdings, Inc. 0.5 % Enbridge, Inc. 0.5 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Toyota Motor Corp., ADR 0.5 % Honda Motor Co., Ltd., ADR 0.5 % Starbucks Corp. 0.5 % Maximus, Inc. 0.5 % Target Corp. 0.5 % Cal-Maine Foods, Inc. 0.5 % America Movil S.A.B. de C.V., ADR 0.5 % Spire, Inc. 0.5 % Southwest Gas Holdings, Inc. 0.5 % Enbridge, Inc. 0.5 % |
| C000041643 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust NASDAQ® Clean Edge®Green Energy Index Fund |
| Class Name | First Trust NASDAQ® Clean Edge®Green Energy Index Fund |
| Trading Symbol | QCLN |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NASDAQ ® ® |
| 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/QCLN 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/QCLN |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ ® ® $ 0.56 % |
| Expenses Paid, Amount | $ 51 |
| Expense Ratio, Percent | 0.56% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned -18.82% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the Russell 2000 ® During the Period, the largest average weight in the Fund was the Information Technology sector at 38.5%. This sector was also the largest drag on the Fund, contributing -9.5% to the Fund’s total return. The largest positive contributor to the Fund’s return was the Consumer Discretionary sector, which contributed 1.3%. This was also the only sector to materially contribute positive returns to the Fund during the Period. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust NASDAQ ® ® -18.82 % 6.92 % 7.76 % Nasdaq ® ® TM -18.87 % 7.20 % 7.89 % Russell 2000 ® 11.54 % 7.40 % 7.82 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/QCLN for more recent performance information. |
| Net Assets | $ 548,439,213 |
| Holdings Count | Holding | 55 |
| Advisory Fees Paid, Amount | $ 2,918,634 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 55 Total advisory fee paid $ Portfolio turnover rate 29 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Tesla, Inc. 9.1 % Rivian Automotive, Inc., Class A 7.0 % ON Semiconductor Corp. 6.9 % First Solar, Inc. 6.9 % Albemarle Corp. 5.2 % Lucid Group, Inc. 5.0 % RBC Dominion Securities, Inc. 4.0 % Bank of America Corp. 3.8 % Enphase Energy, Inc. 3.7 % Acuity Brands, Inc. 3.5 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Tesla, Inc. 9.1 % Rivian Automotive, Inc., Class A 7.0 % ON Semiconductor Corp. 6.9 % First Solar, Inc. 6.9 % Albemarle Corp. 5.2 % Lucid Group, Inc. 5.0 % RBC Dominion Securities, Inc. 4.0 % Bank of America Corp. 3.8 % Enphase Energy, Inc. 3.7 % Acuity Brands, Inc. 3.5 % |
| C000047557 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust S&P REIT Index Fund |
| Class Name | First Trust S&P REIT Index Fund |
| Trading Symbol | FRI |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust S&P REIT Index Fund (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FRI 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/FRI |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust S&P REIT Index Fund $ 0.49 % |
| Expenses Paid, Amount | $ 51 |
| Expense Ratio, Percent | 0.49% |
| 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 December 31, 2024. The Fund underperformed its benchmark, the Russell 3000 ® During the Period, the Retail Real Estate Investment Trusts (“REITs”) category received the greatest allocation of any category in the Fund with an average weight of 16.7%. The allocation to this category contributed 2.4% to the Fund’s overall return. With a weight of 12.7%, the Health Care REITs category contributed 3.0% to the Fund’s return, which was the greatest return contribution of any category. The most negative contribution to the Fund’s return of -3.0% came from the Industrial REITs category which had an average weight of 15.0%. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust S&P REIT Index Fund 7.96 % 3.80 % 5.01 % S&P United States REIT Index 8.44 % 4.30 % 5.55 % FTSE EPRA/NAREIT North America Index 7.36 % 3.26 % 4.93 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/FRI for more recent performance information. |
| Net Assets | $ 176,521,238 |
| Holdings Count | Holding | 138 |
| Advisory Fees Paid, Amount | $ 435,803 |
| Investment Company Portfolio Turnover | 7% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 138 Total advisory fee paid $ Portfolio turnover rate 7 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Prologis, Inc. 8.5 % Equinix, Inc. 7.9 % Welltower, Inc. 6.5 % Digital Realty Trust, Inc. 4.6 % Simon Property Group, Inc. 4.6 % Public Storage 4.1 % Realty Income Corp. 4.1 % Extra Space Storage, Inc. 2.8 % AvalonBay Communities, Inc. 2.7 % Iron Mountain, Inc. 2.7 % REIT Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Prologis, Inc. 8.5 % Equinix, Inc. 7.9 % Welltower, Inc. 6.5 % Digital Realty Trust, Inc. 4.6 % Simon Property Group, Inc. 4.6 % Public Storage 4.1 % Realty Income Corp. 4.1 % Extra Space Storage, Inc. 2.8 % AvalonBay Communities, Inc. 2.7 % Iron Mountain, Inc. 2.7 % |
| C000047627 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Natural Gas ETF |
| Class Name | First Trust Natural Gas ETF |
| Trading Symbol | FCG |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Natural Gas ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FCG 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/FCG |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Natural Gas ETF $ 0.57 % |
| Expenses Paid, Amount | $ 58 |
| Expense Ratio, Percent | 0.57% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 3.98% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P Composite 1500 ® During the Period, the Oil & Gas Exploration and Production sub-industry was the largest allocation in the Fund at 84.2%. This sub-industry contributed 2.1% to the Fund’s overall return. The Oil and Gas Storage and Transportation sub-industry received the second highest allocation by sub-industry at an average weight of 9.7% and contributed 2.8% to the Fund’s return. The most negative contribution to return came from the Integrated Oil & Gas sub-industry, which received only a single allocation, Occidental Petroleum Corporation. The 1.7% allocation to this security caused -0.7% drag to the Fund’s |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Natural Gas ETF 3.98 % 19.10 % -5.49 % ISE-Revere Natural Gas TM 4.68 % 18.68 % -5.60 % S&P Composite 1500 ® 5.98 % 12.11 % 4.34 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/FCG for more recent performance information. |
| Net Assets | $ 402,372,855 |
| Holdings Count | Holding | 45 |
| Advisory Fees Paid, Amount | $ 1,616,815 |
| Investment Company Portfolio Turnover | 38% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 45 Total advisory fee paid $ Portfolio turnover rate 38 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Hess Midstream, L.P., Class A 4.6 % Western Midstream Partners, L.P. 4.4 % Occidental Petroleum Corp. 4.4 % ConocoPhillips 4.2 % EQT Corp. 4.1 % EOG Resources, Inc. 4.0 % Expand Energy Corp. 3.9 % Diamondback Energy, Inc. 3.9 % APA Corp. 3.6 % Coterra Energy, Inc. 3.6 % Sub-Industry Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Hess Midstream, L.P., Class A 4.6 % Western Midstream Partners, L.P. 4.4 % Occidental Petroleum Corp. 4.4 % ConocoPhillips 4.2 % EQT Corp. 4.1 % EOG Resources, Inc. 4.0 % Expand Energy Corp. 3.9 % Diamondback Energy, Inc. 3.9 % APA Corp. 3.6 % Coterra Energy, Inc. 3.6 % |
| C000047628 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Water ETF |
| Class Name | First Trust Water ETF |
| Trading Symbol | FIW |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Water ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FIW 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/FIW |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Water ETF $ 0.51 % |
| Expenses Paid, Amount | $ 53 |
| Expense Ratio, Percent | 0.51% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 8.37% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the Russell 3000 ® During the Period, the largest sector allocation was the Industrials sector, with an average portfolio weight of 55.3%. This sector also contributed the most to the Fund’s return at 6.3%. The most negatively contributing sector was the Utilities sector. This sector carried an average weight of 16.6% and caused a |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust Water ETF 8.37 % 11.96 % 12.53 % ISE Clean Edge Water TM 8.95 % 12.76 % 13.21 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/FIW for more recent performance information. |
| Net Assets | $ 1,775,803,066 |
| Holdings Count | Holding | 38 |
| Advisory Fees Paid, Amount | $ 6,860,223 |
| Investment Company Portfolio Turnover | 15% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 38 Total advisory fee paid $ Portfolio turnover rate 15 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Waters Corp. 4.5 % IDEX Corp. 4.3 % Pentair PLC 4.2 % Agilent Technologies, Inc. 4.0 % Roper Technologies, Inc. 3.9 % AECOM 3.9 % Ecolab, Inc. 3.9 % Veralto Corp. 3.8 % American Water Works Co., Inc. 3.7 % IDEXX Laboratories, Inc. 3.6 % Sector Allocation Any amount shown as 0.0% represents less than 0.1% |
| Largest Holdings [Text Block] | Top Ten Holdings Waters Corp. 4.5 % IDEX Corp. 4.3 % Pentair PLC 4.2 % Agilent Technologies, Inc. 4.0 % Roper Technologies, Inc. 3.9 % AECOM 3.9 % Ecolab, Inc. 3.9 % Veralto Corp. 3.8 % American Water Works Co., Inc. 3.7 % IDEXX Laboratories, Inc. 3.6 % |
| C000078718 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust NASDAQ®ABA Community Bank Index Fund |
| Class Name | First Trust NASDAQ®ABA Community Bank Index Fund |
| Trading Symbol | QABA |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NASDAQ ® |
| 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/QABA 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/QABA |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ ® $ 0.60 % |
| Expenses Paid, Amount | $ 64 |
| 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 14.51% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P Composite 1500 ® During the Period, 98.0% of the Fund was allocated to the Regional Banks sub-industry, with the bulk of the remainder of the average allocations being in other financial-related sub-industries. Regional banks contributed 15.3% towards the Fund’s return, the greatest of any sub-industry. The Commercial & Residential Mortgage Finance sub-industry contributed the only negative contribution to the Fund’s return of all sub-industries, detracting -0.1% from the Fund’s return. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (December 31, 2014 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year 10 Year First Trust NASDAQ ® 14.51 % 4.01 % 6.46 % Nasdaq OMX ® TM 15.24 % 4.66 % 7.13 % S&P Composite 1500 ® 29.78 % 11.44 % 11.33 % Russell 3000 ® 23.81 % 13.86 % 12.55 % |
| 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/QABA for more recent performance information. |
| Net Assets | $ 122,247,168 |
| Holdings Count | Holding | 159 |
| Advisory Fees Paid, Amount | $ 347,252 |
| Investment Company Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 159 Total advisory fee paid $ Portfolio turnover rate 20 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Commerce Bancshares, Inc. 4.1 % Wintrust Financial Corp. 4.1 % UMB Financial Corp. 2.7 % First Financial Bankshares, Inc. 2.5 % United Bankshares, Inc. 2.5 % Bank OZK 2.5 % Hancock Whitney Corp. 2.3 % International Bancshares Corp. 1.9 % BancFirst Corp. 1.9 % Texas Capital Bancshares, Inc. 1.8 % Industry Allocation Any amount shown as 0.0% represents less than 0.1% |
| Largest Holdings [Text Block] | Top Ten Holdings Commerce Bancshares, Inc. 4.1 % Wintrust Financial Corp. 4.1 % UMB Financial Corp. 2.7 % First Financial Bankshares, Inc. 2.5 % United Bankshares, Inc. 2.5 % Bank OZK 2.5 % Hancock Whitney Corp. 2.3 % International Bancshares Corp. 1.9 % BancFirst Corp. 1.9 % Texas Capital Bancshares, Inc. 1.8 % |
| C000191287 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Dow 30 Equal Weight ETF |
| Class Name | First Trust Dow 30 Equal Weight ETF |
| Trading Symbol | EDOW |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dow 30 Equal Weight ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/EDOW 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/EDOW |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow 30 Equal Weight ETF $ 0.50 % |
| Expenses Paid, Amount | $ 53 |
| Expense Ratio, Percent | 0.50% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 13.16% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the Dow Jones Industrial Average TM During the Period, the largest sector allocation by weight was the Information Technology sector, with an average portfolio weight of 19.9%. The Financials sector contributed the most to the Fund’s return, contributing 6.5%. The largest negative contribution to the Fund’s return came from the Materials sector, which contributed -0.6%. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (August 8, 2017 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year Since First Trust Dow 30 Equal Weight ETF 13.16 % 8.86 % 10.49 % Dow Jones Industrial Average ® 13.77 % 9.53 % 11.13 % Dow Jones Industrial Average TM 14.99 % 10.55 % 11.64 % S&P 500 ® 25.02 % 14.53 % 14.36 % |
| Performance Inception Date | Aug. 08, 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/EDOW for more recent performance information. |
| Net Assets | $ 230,517,383 |
| Holdings Count | Holding | 31 |
| Advisory Fees Paid, Amount | $ 1,161,536 |
| Investment Company Portfolio Turnover | 28% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 31 Total advisory fee paid $ Portfolio turnover rate 28 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Boeing (The) Co. 3.7 % Apple, Inc. 3.5 % Cisco Systems, Inc. 3.5 % Visa, Inc., Class A 3.5 % Merck & Co., Inc. 3.4 % 3M Co. 3.4 % Coca-Cola (The) Co. 3.4 % Johnson & Johnson 3.4 % Honeywell International, Inc. 3.4 % JPMorgan Chase & Co. 3.4 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Boeing (The) Co. 3.7 % Apple, Inc. 3.5 % Cisco Systems, Inc. 3.5 % Visa, Inc., Class A 3.5 % Merck & Co., Inc. 3.4 % 3M Co. 3.4 % Coca-Cola (The) Co. 3.4 % Johnson & Johnson 3.4 % Honeywell International, Inc. 3.4 % JPMorgan Chase & Co. 3.4 % |
| C000201408 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Lunt U.S. Factor Rotation ETF |
| Class Name | First Trust Lunt U.S. Factor Rotation ETF |
| Trading Symbol | FCTR |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Lunt U.S. Factor Rotation ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FCTR 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/FCTR |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Lunt U.S. Factor Rotation ETF $ 0.65 % |
| Expenses Paid, Amount | $ 71 |
| Expense Ratio, Percent | 0.65% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 19.60% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the Nasdaq US 500 Large Cap TM During the Period, the largest sector allocation by weight was the Information Technology sector, with an average portfolio weight of 20.9%. The Financials sector was also highly weighted at 19.2%. The Information Technology sector contributed the most to the Fund’s return, at 12.2%. The largest negative contribution to the Fund’s return came from the Consumer Staples sector, at -1.3%. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (July 25, 2018 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year 5 Year Since First Trust Lunt U.S. Factor Rotation ETF 19.60 % 8.61 % 8.91 % Lunt Capital Large Cap Factor Rotation Index 20.54 % 9.44 % 9.73 % Nasdaq US 500 Large Cap TM 25.61 % 14.59 % 13.92 % S&P 500 ® 25.02 % 14.53 % 13.84 % |
| Performance Inception Date | Jul. 25, 2018 |
| 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/FCTR for more recent performance information. |
| Net Assets | $ 70,896,515 |
| Holdings Count | Holding | 179 |
| Advisory Fees Paid, Amount | $ 469,835 |
| Investment Company Portfolio Turnover | 431% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 179 Total advisory fee paid $ Portfolio turnover rate 431 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings AppLovin Corp., Class A 4.0 % Palantir Technologies, Inc., Class A 2.0 % Vistra Corp. 1.7 % Motorola Solutions, Inc. 1.7 % United Airlines Holdings, Inc. 1.6 % Paychex, Inc. 1.5 % Broadridge Financial Solutions, Inc. 1.4 % Stryker Corp. 1.3 % Automatic Data Processing, Inc. 1.1 % General Motors Co. 1.1 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings AppLovin Corp., Class A 4.0 % Palantir Technologies, Inc., Class A 2.0 % Vistra Corp. 1.7 % Motorola Solutions, Inc. 1.7 % United Airlines Holdings, Inc. 1.6 % Paychex, Inc. 1.5 % Broadridge Financial Solutions, Inc. 1.4 % Stryker Corp. 1.3 % Automatic Data Processing, Inc. 1.1 % General Motors Co. 1.1 % |
| C000222996 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | FT Vest Gold Strategy Target Income ETF® |
| Class Name | FT Vest Gold Strategy Target Income ETF® |
| Trading Symbol | IGLD |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the FT Vest Gold Strategy Target Income ETF ® |
| 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/IGLD 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/IGLD |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage FT Vest Gold Strategy Target Income ETF ® $ 0.85 % |
| Expenses Paid, Amount | $ 93 |
| Expense Ratio, Percent | 0.85% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 18.80% for the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® This underperformance was due to the following: Fund Net Asset Value Performance Attributed to: Equities/Synthetic equities on GLD 26.66 % GLD Options (Short Calls) -7.01 % Fees and expenses -0.85 % The Fund held securities with the economic equivalent to a long position (“Synthetic Long”) in SPDR ® |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (March 2, 2021 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since FT Vest Gold Strategy Target Income ETF ® 18.80 % 7.41 % LBMA Gold Price 25.53 % 11.42 % S&P 500 ® 25.02 % 13.25 % |
| Performance Inception Date | Mar. 02, 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/IGLD for more recent performance information. |
| Net Assets | $ 130,897,042 |
| Holdings Count | Holding | 5 |
| Advisory Fees Paid, Amount | $ 903,248 |
| Investment Company Portfolio Turnover | 0% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 5 Total advisory fee paid $ Portfolio turnover rate 0 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund. Fund Allocation U.S. Treasury Bills 145.3 % Money Market Funds 2.4 % Purchased Options 0.3 % Written Options (46.7 % ) Net Other Assets and Liabilities (1.3 % ) Total 100.0 % |
| C000222997 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | FT Vest Gold Strategy Quarterly Buffer ETF |
| Class Name | FT Vest Gold Strategy Quarterly Buffer ETF |
| Trading Symbol | BGLD |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the FT Vest Gold Strategy Quarterly Buffer ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/BGLD info ftportfolios.com |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. |
| Additional Information Phone Number | 1-800-621-1675 |
| Additional Information Email | info@ftportfolios.com |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/BGLD |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage FT Vest Gold Strategy Quarterly Buffer ETF $ 0.90 % |
| Expenses Paid, Amount | $ 100 |
| Expense Ratio, Percent | 0.90% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 21.87% for the 12 months ended December 31, 2024. ® This underperformance was due to the following: Fund Net Asset Value Performance Attributed to: Equities/Synthetic equities on GLD 26.66 % GLD Options (Buffer and Cap) -3.89 % Fees and expenses -0.90 % The Fund seeks to provide returns (before fees and expenses) that match the price return of the SPDR ® |
| 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 20, 2021 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since FT Vest Gold Strategy Quarterly Buffer ETF 21.87 % 6.34 % LBMA Gold Price 25.53 % 9.01 % S&P 500 ® 25.02 % 13.03 % |
| Performance Inception Date | Jan. 20, 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/BGLD for more recent performance information. |
| Net Assets | $ 51,381,943 |
| Holdings Count | Holding | 5 |
| Advisory Fees Paid, Amount | $ 281,015 |
| Investment Company Portfolio Turnover | 0% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 5 Total advisory fee paid $ Portfolio turnover rate 0 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund. Fund Allocation U.S. Treasury Bills 94.8 % Money Market Funds 0.5 % Purchased Options 4.9 % Written Options (0.3 % ) Net Other Assets and Liabilities 0.1 % Total 100.0 % |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since January 1, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/BGLD info ftportfolios.com During the fiscal year ended December 31, 2024, the Fund’s predetermined upside cap on Underlying ETF returns was reset based upon prevailing market conditions at the start of each new Target Outcome Period. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since January 1, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/BGLD info ftportfolios.com |
| Updated Prospectus Phone Number | 1-800-621-1675 |
| Updated Prospectus Email Address | info@ftportfolios.com |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/BGLD |
| C000238091 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Indxx Aerospace & Defense ETF |
| Class Name | First Trust Indxx Aerospace & Defense ETF |
| Trading Symbol | MISL |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Indxx Aerospace & Defense ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/MISL 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/MISL |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Indxx Aerospace & Defense ETF $ 0.60 % |
| Expenses Paid, Amount | $ 66 |
| 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 20.44% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® During the Period, the Aerospace & Defense sub-industry received the greatest allocation of any sub-industry in the Fund with an average weight of 83.6%. The allocation to this sub-industry contributed 16.0% to the Fund’s overall return, the greatest return contribution of any sub-industry. No sub-industry had a material negative contribution to the Fund’s return. |
| 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 25, 2022 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since First Trust Indxx Aerospace & Defense ETF 20.44 % 19.86 % Indxx US Aerospace & Defense Index 21.22 % 20.57 % S&P 500 ® 25.02 % 23.18 % S&P Composite 1500 ® 15.30 % 15.46 % |
| Performance Inception Date | Oct. 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/MISL for more recent performance information. |
| Net Assets | $ 111,051,232 |
| Holdings Count | Holding | 35 |
| Advisory Fees Paid, Amount | $ 433,937 |
| Investment Company Portfolio Turnover | 16% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 35 Total advisory fee paid $ Portfolio turnover rate 16 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Boeing (The) Co. 9.9 % RTX Corp. 7.9 % TransDigm Group, Inc. 7.6 % General Dynamics Corp. 7.4 % Lockheed Martin Corp. 6.8 % Howmet Aerospace, Inc. 4.4 % Curtiss-Wright Corp. 3.9 % HEICO Corp. 3.8 % Northrop Grumman Corp. 3.7 % Textron, Inc. 3.7 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Boeing (The) Co. 9.9 % RTX Corp. 7.9 % TransDigm Group, Inc. 7.6 % General Dynamics Corp. 7.4 % Lockheed Martin Corp. 6.8 % Howmet Aerospace, Inc. 4.4 % Curtiss-Wright Corp. 3.9 % HEICO Corp. 3.8 % Northrop Grumman Corp. 3.7 % Textron, Inc. 3.7 % |
| C000238354 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust Growth StrengthTM ETF |
| Class Name | First Trust Growth StrengthTM ETF |
| Trading Symbol | FTGS |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Growth Strength TM |
| 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/FTGS 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/FTGS |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Growth Strength TM $ 0.60 % |
| Expenses Paid, Amount | $ 65 |
| 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 15.87% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® During the Period, the Information Technology sector received the greatest allocation of any sector in the Fund with an average weight of 29.3%. The allocation to this sector contributed 6.8% to the Fund’s overall return, which was the greatest return contribution of any sector. The most negative contribution to the Fund’s return came from the Energy sector, at -1.1%. This sector also had an average weight of 9.0%. |
| 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 25, 2022 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since First Trust Growth Strength TM 15.87 % 22.80 % The Growth Strength™ Index 16.62 % 23.52 % S&P 500 ® 25.02 % 23.18 % |
| Performance Inception Date | Oct. 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/FTGS for more recent performance information. |
| Net Assets | $ 909,410,740 |
| Holdings Count | Holding | 51 |
| Advisory Fees Paid, Amount | $ 2,831,601 |
| Investment Company Portfolio Turnover | 102% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 51 Total advisory fee paid $ Portfolio turnover rate 102 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Deckers Outdoor Corp. 2.6 % Expedia Group, Inc. 2.4 % Netflix, Inc. 2.4 % Cadence Design Systems, Inc. 2.4 % Amazon.com, Inc. 2.4 % Live Nation Entertainment, Inc. 2.3 % Arista Networks, Inc. 2.2 % Visa, Inc., Class A 2.2 % Dexcom, Inc. 2.2 % American Express Co. 2.2 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Deckers Outdoor Corp. 2.6 % Expedia Group, Inc. 2.4 % Netflix, Inc. 2.4 % Cadence Design Systems, Inc. 2.4 % Amazon.com, Inc. 2.4 % Live Nation Entertainment, Inc. 2.3 % Arista Networks, Inc. 2.2 % Visa, Inc., Class A 2.2 % Dexcom, Inc. 2.2 % American Express Co. 2.2 % |
| C000241319 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust BloombergInflation Sensitive Equity ETF |
| Class Name | First Trust BloombergInflation Sensitive Equity ETF |
| Trading Symbol | FTIF |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Bloomberg Inflation Sensitive Equity ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FTIF 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/FTIF |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Bloomberg Inflation Sensitive Equity ETF $ 0.60 % |
| Expenses Paid, Amount | $ 60 |
| 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 0.55% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® During the Period, the Energy sector received the greatest allocation of any sector in the Fund with an average weight of 33.7%. The allocation to this sector contributed -3.7% to the Fund’s overall return, which was the most negative return contribution of any sector. With an average weight of 27.2%, the Industrials sector contributed 4.7% to the Fund’s return, which was the greatest return contribution of any sector. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (March 13, 2023 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since First Trust Bloomberg Inflation Sensitive Equity ETF 0.55 % 7.37 % Bloomberg Inflation Sensitive Equity Index 1.10 % 8.01 % S&P 500 ® 25.02 % 28.28 % |
| Performance Inception Date | Mar. 13, 2023 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTIF for more recent performance information. |
| Net Assets | $ 1,071,369 |
| Holdings Count | Holding | 50 |
| Advisory Fees Paid, Amount | $ 9,176 |
| Investment Company Portfolio Turnover | 90% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 50 Total advisory fee paid $ Portfolio turnover rate 90 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings ConocoPhillips 3.7 % Cummins, Inc. 2.6 % International Paper Co. 2.6 % Quanta Services, Inc. 2.6 % Packaging Corp. of America 2.6 % CRH PLC 2.6 % Jones Lang LaSalle, Inc. 2.6 % Westinghouse Air Brake Technologies Corp. 2.5 % Keysight Technologies, Inc. 2.5 % RTX Corp. 2.4 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings ConocoPhillips 3.7 % Cummins, Inc. 2.6 % International Paper Co. 2.6 % Quanta Services, Inc. 2.6 % Packaging Corp. of America 2.6 % CRH PLC 2.6 % Jones Lang LaSalle, Inc. 2.6 % Westinghouse Air Brake Technologies Corp. 2.5 % Keysight Technologies, Inc. 2.5 % RTX Corp. 2.4 % |
| C000244355 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust S&P 500 Diversified Free Cash Flow ETF |
| Class Name | First Trust S&P 500 Diversified Free Cash Flow ETF |
| Trading Symbol | FCFY |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust S&P 500 Diversified Free Cash Flow ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/FCFY 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/FCFY |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust S&P 500 Diversified Free Cash Flow ETF $ 0.60 % |
| Expenses Paid, Amount | $ 63 |
| 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 11.28% during the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® During the Period, the Information Technology sector received the greatest allocation of any sector in the Fund with an average weight of 29.6%. The allocation to this sector contributed 3.8% to the Fund’s overall return. With an average weight of 13.9%, the Financials sector contributed 4.2% to the Fund’s return, the greatest return contribution of any sector. The most negative contribution to the Fund’s return came from the Materials sector at -0.4%. This sector also had an average weight in the Fund of 2.1%. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (August 23, 2023 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since First Trust S&P 500 Diversified Free Cash Flow ETF 11.28 % 16.26 % S&P 500 ® 11.99 % 17.00 % S&P 500 ® 25.02 % 24.91 % |
| Performance Inception Date | Aug. 23, 2023 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FCFY for more recent performance information. |
| Net Assets | $ 1,204,294 |
| Holdings Count | Holding | 101 |
| Advisory Fees Paid, Amount | $ 7,085 |
| Investment Company Portfolio Turnover | 63% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 101 Total advisory fee paid $ Portfolio turnover rate 63 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Warner Bros. Discovery, Inc. 4.6 % Skyworks Solutions, Inc. 3.2 % Gen Digital, Inc. 3.0 % Hewlett Packard Enterprise Co. 2.9 % Jabil, Inc. 2.7 % HP, Inc. 2.6 % Synchrony Financial 2.5 % EPAM Systems, Inc. 2.5 % F5, Inc. 2.3 % QUALCOMM, Inc. 2.1 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Warner Bros. Discovery, Inc. 4.6 % Skyworks Solutions, Inc. 3.2 % Gen Digital, Inc. 3.0 % Hewlett Packard Enterprise Co. 2.9 % Jabil, Inc. 2.7 % HP, Inc. 2.6 % Synchrony Financial 2.5 % EPAM Systems, Inc. 2.5 % F5, Inc. 2.3 % QUALCOMM, Inc. 2.1 % |
| C000252251 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust WCM Developing World Equity ETF |
| Class Name | First Trust WCM Developing World Equity ETF |
| Trading Symbol | WCME |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust WCM Developing World Equity ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/WCME info ftportfolios.com |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. |
| Additional Information Phone Number | 1-800-621-1675 |
| Additional Information Email | info@ftportfolios.com |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/WCME |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust WCM Developing World Equity ETF $ 1.01 % |
| Expenses Paid, Amount | $ 101 |
| Expense Ratio, Percent | 1.01% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 0.45% for the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 7.50% for the same Period. This underperformance was driven by an underweight position in Information Technology and an overweight in Health Care (from a sector allocation standpoint), as well as stock selection within the Health Care, Information Technology, and Consumer Discretionary sectors. Additionally, emerging markets have outperformed developed markets over the prior 12 months, which served as a headwind as the Fund is more heavily weighted towards developed markets versus the benchmark. Contributors to Performance (selection and allocation): From a sector standpoint, the picks in the Materials, Energy, and Financials sectors were additive on a selection effect basis. The underweight positions in the Materials, Consumer Staples, and Consumer Discretionary sectors were additive from an allocation perspective. On a geographic basis, the picks in the Americas and Europe were additive from a selection effect angle. From an allocation perspective, overweight positions in Africa and the Middle East contributed positively to returns. Detractors from Performance (selection and allocation): Looking at sector-specific selection, the picks in the Information Technology, Health Care, and Consumer Discretionary sectors were detractors from performance. We saw some detraction to performance from an allocation effect standpoint from an underweight position in Information Technology, as well as the overweight positions in Health Care and Industrials. The picks in Asia Pacific and Africa and the Middle East detracted from performance from a geographic selection effect angle. From an allocation standpoint, overweight positions in the Americas and Europe, as well as an underweight position in Asia Pacific, detracted from performance. Stylistic Factors Impacting Performance (within the benchmark): High Quality stocks (on a return on equity basis) outperformed Low Quality, which served as a tailwind. Large Cap outperformed Small Cap, serving as a tailwind. Emerging markets outperformed Developed markets, which served as a headwind as the Fund is more heavily weighted towards Developed markets versus the benchmark. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (March 31, 2020 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since First Trust WCM Developing World Equity ETF 0.45 % 7.51 % MSCI Emerging Markets Index 7.50 % 7.72 % |
| Performance Inception Date | Mar. 31, 2020 |
| 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/WCME for more recent performance information. |
| Net Assets | $ 2,323,210 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 85% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 32 Total advisory fee paid $ Portfolio turnover rate 85 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Taiwan Semiconductor Manufacturing Co., Ltd. 9.2 % United Overseas Bank Ltd. 5.1 % HDFC Bank Ltd., ADR 4.6 % TOTVS S.A. 4.1 % Tencent Holdings Ltd. 4.0 % Bid Corp., Ltd. 3.9 % B3 S.A. - Brasil Bolsa Balcao 3.8 % Nippon Paint Holdings Co., Ltd. 3.8 % Grupo Aeroportuario del Pacifico S.A.B. de C.V., Class B 3.5 % AstraZeneca PLC 3.4 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Taiwan Semiconductor Manufacturing Co., Ltd. 9.2 % United Overseas Bank Ltd. 5.1 % HDFC Bank Ltd., ADR 4.6 % TOTVS S.A. 4.1 % Tencent Holdings Ltd. 4.0 % Bid Corp., Ltd. 3.9 % B3 S.A. - Brasil Bolsa Balcao 3.8 % Nippon Paint Holdings Co., Ltd. 3.8 % Grupo Aeroportuario del Pacifico S.A.B. de C.V., Class B 3.5 % AstraZeneca PLC 3.4 % |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since its reorganization on October 7, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/WCME info ftportfolios.com During the fiscal year ended December 31, 2024, the Fund added the ability to invest in equity securities of companies domiciled in China that list and trade directly on Chinese stock exchanges (“China A Shares”). |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since its reorganization on October 7, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/WCME info ftportfolios.com |
| Updated Prospectus Phone Number | 1-800-621-1675 |
| Updated Prospectus Email Address | info@ftportfolios.com |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/WCME |
| C000252253 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | First Trust WCM International Equity ETF |
| Class Name | First Trust WCM International Equity ETF |
| Trading Symbol | WCMI |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust WCM International Equity ETF (the “Fund”) for the year of January 1, 2024 to December 31, 2024 (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/WCMI info ftportfolios.com |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. |
| Additional Information Phone Number | 1-800-621-1675 |
| Additional Information Email | info@ftportfolios.com |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/WCMI |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust WCM International Equity ETF $ 0.86 % |
| Expenses Paid, Amount | $ 88 |
| Expense Ratio, Percent | 0.86% |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 3.48% for the 12 months ended December 31, 2024. The Fund underperformed its benchmark, the MSCI ACWI ex-USA Index, which returned 5.53% for the same Period. This underperformance was driven by an overweight position in Health Care and underweight position in Information Technology (from a sector allocation standpoint), as well as stock selection within the Health Care, Information Technology, and Communication Services sectors. Additionally, emerging markets outperformed developed markets over the prior 12 months, which served as a headwind as the Fund is more heavily weighted towards developed markets versus the benchmark. Contributors to Performance (selection and allocation): From a sector standpoint, positive selection effect was supported by picks in the Energy, Materials, and Consumer Staples sectors. An overweight position in the Financials sector, as well as underweight positions in the Consumer Staples and Materials sectors were also additive from an allocation perspective. On a geographic basis, picks in Europe and the Americas were additive from a selection effect angle. From an allocation perspective, the portfolio positioning did not contribute positively to returns. Detractors from Performance (selection and allocation): Looking at sector-specific selection, picks in the Health Care, Information Technology, and Communication Services sectors were the largest detractors from performance. Detractors from an allocation standpoint came from an overweight position in the Health Care sector, as well as an underweight positions in the Information Technology and Communication Services sectors. The picks in Asia Pacific detracted from the Fund’s performance from a geographic selection effect angle. From an allocation standpoint, underweight positions in Asia Pacific and Africa and the Middle East, as well overweight positions in the Americas and Europe, detracted from performance. Stylistic Factors Impacting Performance (within the benchmark): High Quality stocks (on a return on equity basis) outperformed Low Quality, which served as a tailwind. Large Cap outperformed Small Cap, serving as a tailwind. Emerging markets outperformed developed markets, which served as a headwind as the Fund is more heavily weighted towards Developed markets versus the benchmark. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | FUND PERFORMANCE (March 31, 2020 to December 31, 2024) 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 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of December 31, 2024) 1 Year Since First Trust WCM International Equity ETF 3.48 % 10.91 % MSCI ACWI ex-USA Index 5.53 % 10.33 % |
| Performance Inception Date | Mar. 31, 2020 |
| 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/WCMI for more recent performance information. |
| Net Assets | $ 54,400,256 |
| Holdings Count | Holding | 37 |
| Advisory Fees Paid, Amount | $ 268,231 |
| Investment Company Portfolio Turnover | 65% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of December 31, 2024) Fund net assets $ Total number of portfolio holdings 37 Total advisory fee paid $ Portfolio turnover rate 65 % |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of December 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings AstraZeneca PLC, ADR 4.9 % United Overseas Bank Ltd. 4.9 % Wise PLC, Class A 4.2 % Persimmon PLC 4.0 % Canadian National Railway Co. 3.8 % HDFC Bank Ltd., ADR 3.4 % Taiwan Semiconductor Manufacturing Co., Ltd. 3.3 % Haleon PLC 3.3 % London Stock Exchange Group PLC 3.2 % Spirax Group PLC 3.2 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings AstraZeneca PLC, ADR 4.9 % United Overseas Bank Ltd. 4.9 % Wise PLC, Class A 4.2 % Persimmon PLC 4.0 % Canadian National Railway Co. 3.8 % HDFC Bank Ltd., ADR 3.4 % Taiwan Semiconductor Manufacturing Co., Ltd. 3.3 % Haleon PLC 3.3 % London Stock Exchange Group PLC 3.2 % Spirax Group PLC 3.2 % |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since its reorganization October 7, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/WCMI info ftportfolios.com During the fiscal year ended December 31, 2024, the Fund added the ability to invest in equity securities of companies domiciled in China that list and trade directly on Chinese stock exchanges (“China A Shares”). |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since its reorganization October 7, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/WCMI info ftportfolios.com |
| Updated Prospectus Phone Number | 1-800-621-1675 |
| Updated Prospectus Email Address | info@ftportfolios.com |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/WCMI |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 16 Months Ended | 22 Months Ended | 26 Months Ended | 46 Months Ended | 47 Months Ended | 57 Months Ended | 60 Months Ended | 77 Months Ended | 89 Months Ended | 120 Months Ended | |||||||||||||||||||||||||||||
| Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Aug. 23, 2023 | Jun. 30, 2023 | Mar. 13, 2023 | Dec. 31, 2022 | Oct. 25, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 02, 2021 | Jan. 20, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jul. 25, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Aug. 08, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | ||
| C000029773 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dow Jones Select MicroCap Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 23,849 | $ 20,858 | $ 21,151 | $ 19,189 | $ 18,723 | $ 17,551 | $ 21,169 | $ 20,301 | $ 15,709 | $ 12,691 | $ 16,407 | $ 14,395 | $ 12,891 | $ 15,972 | $ 14,771 | $ 13,705 | $ 13,621 | $ 10,307 | $ 10,056 | $ 10,520 | $ 10,000 | |||||||||
| Average Annual Return, Percent | 12.73% | 7.76% | 9.08% | |||||||||||||||||||||||||||||||||||||
| C000030350 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Morningstar Dividend Leaders Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 24,889 | 24,889 | 24,889 | 24,889 | 24,889 | 24,889 | 24,889 | $ 24,889 | 24,889 | 24,889 | $ 24,889 | 22,966 | 21,275 | 19,686 | 20,679 | 19,455 | 19,377 | 17,715 | 15,531 | 13,009 | 16,249 | 14,932 | 13,066 | 13,420 | 13,881 | 12,763 | 12,401 | 11,785 | 10,273 | 9,697 | 10,000 | |||||||||
| Average Annual Return, Percent | 16.98% | 8.90% | 9.55% | |||||||||||||||||||||||||||||||||||||
| C000030351 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust US Equity Opportunities ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 25,155 | 25,155 | 25,155 | 25,155 | 25,155 | 25,155 | 25,155 | $ 25,155 | 25,155 | 25,155 | $ 25,155 | 20,878 | 20,118 | 18,501 | 16,492 | 17,060 | 25,387 | 26,393 | 24,490 | 17,355 | 16,573 | 15,985 | 12,706 | 14,568 | 13,844 | 12,070 | 10,904 | 10,153 | 10,219 | 10,864 | 10,000 | |||||||||
| Average Annual Return, Percent | 25.02% | 8.70% | 9.66% | |||||||||||||||||||||||||||||||||||||
| C000030477 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust NASDAQ-100 Equal Weighted Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 30,839 | 30,839 | 30,839 | 30,839 | 30,839 | 30,839 | 30,839 | $ 30,839 | 30,839 | 30,839 | $ 30,839 | 30,407 | 28,882 | 26,161 | 21,631 | 21,242 | 28,694 | 27,144 | 24,386 | 19,271 | 17,755 | 16,000 | 13,076 | 14,438 | 13,787 | 12,673 | 10,941 | 9,929 | 10,223 | 10,237 | 10,000 | |||||||||
| Average Annual Return, Percent | 6.81% | 11.68% | 11.92% | |||||||||||||||||||||||||||||||||||||
| C000030478 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust NASDAQ-100-Technology Sector Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 45,661 | 45,661 | 45,661 | 45,661 | 45,661 | 45,661 | 45,661 | $ 45,661 | 45,661 | 45,661 | $ 45,661 | 47,979 | 42,625 | 35,762 | 25,539 | 27,703 | 42,430 | 38,489 | 33,428 | 26,375 | 24,080 | 20,492 | 16,230 | 18,281 | 17,031 | 14,707 | 12,354 | 10,151 | 9,862 | 9,753 | 10,000 | |||||||||
| Average Annual Return, Percent | 7.12% | 13.65% | 16.40% | |||||||||||||||||||||||||||||||||||||
| C000033929 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust NYSE® Arca® Biotechnology Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 16,403 | 16,403 | 16,403 | 16,403 | 16,403 | 16,403 | 16,403 | $ 16,403 | 16,403 | 16,403 | $ 16,403 | 15,107 | 15,508 | 14,977 | 15,165 | 13,309 | 15,895 | 16,947 | 16,495 | 16,459 | 14,607 | 13,819 | 12,195 | 13,746 | 12,221 | 11,185 | 8,921 | 8,786 | 11,096 | 12,168 | 10,000 | |||||||||
| Average Annual Return, Percent | 5.76% | 2.34% | 5.07% | |||||||||||||||||||||||||||||||||||||
| C000033930 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dow Jones Internet Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 39,716 | 39,716 | 39,716 | 39,716 | 39,716 | 39,716 | 39,716 | $ 39,716 | 39,716 | 39,716 | $ 39,716 | 33,419 | 30,428 | 26,594 | 20,091 | 20,725 | 36,877 | 39,940 | 34,643 | 27,817 | 22,695 | 23,440 | 19,029 | 22,456 | 17,915 | 15,455 | 13,018 | 11,765 | 12,177 | 10,959 | 10,000 | |||||||||
| Average Annual Return, Percent | 30.52% | 11.84% | 14.79% | |||||||||||||||||||||||||||||||||||||
| C000034137 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Capital Strength® ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 26,308 | 26,308 | 26,308 | 26,308 | 26,308 | 26,308 | 26,308 | $ 26,308 | 26,308 | 26,308 | $ 26,308 | 24,987 | 23,655 | 22,016 | 21,787 | 20,198 | 24,279 | 21,591 | 19,182 | 16,532 | 16,970 | 15,739 | 13,387 | 14,075 | 13,959 | 12,404 | 11,037 | 10,708 | 10,165 | 9,983 | 10,000 | |||||||||
| Average Annual Return, Percent | 11.21% | 9.17% | 10.16% | |||||||||||||||||||||||||||||||||||||
| C000035622 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust NASDAQ-100 Ex-Technology Sector Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 24,791 | 24,791 | 24,791 | 24,791 | 24,791 | 24,791 | 24,791 | $ 24,791 | 24,791 | 24,791 | $ 24,791 | 23,341 | 23,227 | 22,058 | 19,892 | 18,340 | 22,825 | 22,227 | 20,416 | 16,128 | 14,958 | 13,977 | 11,654 | 12,731 | 12,342 | 11,714 | 10,250 | 9,840 | 10,474 | 10,543 | 10,000 | |||||||||
| Average Annual Return, Percent | 6.73% | 10.63% | 9.50% | |||||||||||||||||||||||||||||||||||||
| C000037851 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dividend StrengthTM ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 22,261 | 22,261 | 22,261 | 22,261 | 22,261 | 22,261 | 22,261 | $ 22,261 | 22,261 | 22,261 | $ 22,261 | 21,098 | 20,040 | 17,963 | 17,918 | 16,953 | 20,773 | 19,683 | 16,602 | 12,752 | 14,609 | 13,643 | 11,654 | 13,542 | 12,968 | 11,678 | 10,858 | 9,709 | 9,402 | 10,118 | 10,000 | |||||||||
| Average Annual Return, Percent | 11.09% | 8.79% | 8.33% | |||||||||||||||||||||||||||||||||||||
| C000037913 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Value Line® Dividend Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 22,619 | 22,619 | 22,619 | 22,619 | 22,619 | 22,619 | 22,619 | $ 22,619 | 22,619 | 22,619 | $ 22,619 | 20,908 | 20,556 | 20,074 | 19,746 | 18,963 | 20,839 | 19,089 | 16,689 | 14,264 | 16,695 | 15,444 | 13,191 | 13,554 | 13,661 | 12,806 | 12,145 | 11,551 | 10,125 | 9,792 | 10,000 | |||||||||
| Average Annual Return, Percent | 10% | 6.26% | 8.50% | |||||||||||||||||||||||||||||||||||||
| C000041643 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust NASDAQ® Clean Edge® Green Energy Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 21,118 | 21,118 | 21,118 | 21,118 | 21,118 | 21,118 | 21,118 | $ 21,118 | 21,118 | 21,118 | $ 21,118 | 21,105 | 26,014 | 31,509 | 28,899 | 31,922 | 41,506 | 42,258 | 42,832 | 18,091 | 15,107 | 12,756 | 10,588 | 11,613 | 12,062 | 10,705 | 9,157 | 8,439 | 9,356 | 10,732 | 10,000 | |||||||||
| Average Annual Return, Percent | (18.82%) | 6.92% | 7.76% | |||||||||||||||||||||||||||||||||||||
| C000047557 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust S&P REIT Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 16,311 | 16,311 | 16,311 | 16,311 | 16,311 | 16,311 | 16,311 | $ 16,311 | 16,311 | 16,311 | $ 16,311 | 15,012 | 15,108 | 14,039 | 13,362 | 14,119 | 17,728 | 15,098 | 12,439 | 11,018 | 13,536 | 12,737 | 10,945 | 11,549 | 11,422 | 11,201 | 11,005 | 11,519 | 10,197 | 9,367 | 10,000 | |||||||||
| Average Annual Return, Percent | 7.96% | 3.80% | 5.01% | |||||||||||||||||||||||||||||||||||||
| C000047627 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Natural Gas ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 5,685 | 5,685 | 5,685 | 5,685 | 5,685 | 5,685 | 5,685 | $ 5,685 | 5,685 | 5,685 | $ 5,685 | 5,980 | 5,466 | 5,158 | 5,330 | 4,675 | 3,620 | 3,409 | 1,822 | 1,505 | 2,373 | 2,815 | 2,820 | 4,461 | 4,323 | 3,893 | 4,887 | 4,536 | 4,090 | 8,525 | 10,000 | |||||||||
| Average Annual Return, Percent | 3.98% | 19.10% | (5.49%) | |||||||||||||||||||||||||||||||||||||
| C000047628 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Water ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 32,556 | 32,556 | 32,556 | 32,556 | 32,556 | 32,556 | 32,556 | $ 32,556 | 32,556 | 32,556 | $ 32,556 | 31,721 | 30,040 | 27,927 | 24,950 | 22,567 | 29,577 | 26,006 | 22,427 | 17,261 | 18,504 | 16,871 | 13,496 | 14,695 | 14,814 | 13,018 | 11,923 | 10,587 | 9,019 | 9,338 | 10,000 | |||||||||
| Average Annual Return, Percent | 8.37% | 11.96% | 12.53% | |||||||||||||||||||||||||||||||||||||
| C000078718 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust NASDAQ® ABA Community Bank Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 18,703 | 18,703 | 18,703 | 18,703 | 18,703 | 18,703 | 18,703 | $ 18,703 | 18,703 | 18,703 | $ 18,703 | 15,317 | 16,335 | 12,738 | 16,741 | 15,647 | 18,337 | 17,015 | 13,673 | 10,660 | 15,369 | 14,045 | 12,516 | 15,688 | 14,925 | 14,326 | 14,843 | 10,606 | 10,789 | 10,913 | 10,000 | |||||||||
| Average Annual Return, Percent | 14.51% | 4.01% | 6.46% | |||||||||||||||||||||||||||||||||||||
| C000191287 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dow 30 Equal Weight ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 20,911 | 20,911 | 20,911 | 20,911 | 20,911 | 20,911 | 20,911 | $ 20,911 | 20,911 | $ 20,911 | $ 20,911 | 19,150 | 18,479 | 16,865 | 15,966 | 14,914 | 17,263 | 16,500 | 14,552 | 12,342 | 13,676 | 12,615 | 11,004 | 11,024 | 11,102 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 13.16% | 8.86% | 10.49% | |||||||||||||||||||||||||||||||||||||
| C000201408 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Lunt U.S. Factor Rotation ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 17,316 | 17,316 | 17,316 | 17,316 | 17,316 | 17,316 | 17,316 | $ 17,316 | $ 17,316 | $ 17,316 | 17,316 | 16,215 | 14,478 | 13,642 | 14,381 | 13,895 | 18,060 | 17,627 | 14,899 | 11,988 | 11,459 | 10,828 | 8,791 | $ 10,000 | ||||||||||||||||
| Average Annual Return, Percent | 19.60% | 8.61% | 8.91% | |||||||||||||||||||||||||||||||||||||
| C000222996 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | FT Vest Gold Strategy Target Income ETF® | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 13,153 | 13,153 | 13,153 | 13,153 | $ 13,153 | 13,153 | 13,153 | $ 13,153 | $ 13,153 | 13,153 | 13,153 | 11,988 | 11,072 | 10,499 | 9,978 | 10,231 | 10,314 | 10,029 | $ 10,000 | |||||||||||||||||||||
| Average Annual Return, Percent | 18.80% | 7.41% | ||||||||||||||||||||||||||||||||||||||
| C000222997 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | FT Vest Gold Strategy Quarterly Buffer ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,744 | 12,744 | 12,744 | 12,744 | $ 12,744 | $ 12,744 | 12,744 | 12,744 | 12,744 | 12,744 | 12,744 | 11,280 | 10,458 | 9,840 | 9,243 | 9,175 | 9,469 | 9,645 | $ 10,000 | |||||||||||||||||||||
| Average Annual Return, Percent | 21.87% | 6.34% | ||||||||||||||||||||||||||||||||||||||
| C000238091 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Indxx Aerospace & Defense ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 14,853 | 14,853 | 14,853 | $ 14,853 | 14,853 | $ 14,853 | 14,853 | 14,853 | 14,853 | 14,853 | 14,853 | 13,605 | 12,332 | 11,216 | 10,734 | $ 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 20.44% | 19.86% | ||||||||||||||||||||||||||||||||||||||
| C000238354 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Growth StrengthTM ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,659 | 15,659 | 15,659 | $ 15,659 | 15,659 | 15,659 | 15,659 | 15,659 | 15,659 | 15,659 | 15,659 | 15,167 | 13,513 | 11,626 | 10,120 | 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 15.87% | 22.80% | ||||||||||||||||||||||||||||||||||||||
| C000241319 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Bloomberg Inflation Sensitive Equity ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,367 | 11,367 | $ 11,367 | $ 11,367 | 11,367 | 11,367 | 11,367 | 11,367 | 11,367 | 11,367 | 11,367 | 11,814 | 11,306 | 10,453 | $ 10,000 | |||||||||||||||||||||||||
| Average Annual Return, Percent | 0.55% | 7.37% | ||||||||||||||||||||||||||||||||||||||
| C000244355 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust S&P 500 Diversified Free Cash Flow ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,266 | $ 12,266 | $ 12,266 | 12,266 | 12,266 | 12,266 | 12,266 | 12,266 | 12,266 | 12,266 | 12,266 | 11,382 | 11,023 | $ 10,000 | ||||||||||||||||||||||||||
| Average Annual Return, Percent | 11.28% | 16.26% | ||||||||||||||||||||||||||||||||||||||
| C000252251 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust WCM Developing World Equity ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 14,108 | $ 14,108 | 14,108 | 14,108 | 14,108 | 14,108 | $ 14,108 | 14,108 | 14,108 | 14,108 | 14,108 | 14,484 | 14,045 | 13,824 | 13,144 | 12,647 | 15,215 | 15,832 | 15,512 | 12,030 | $ 10,000 | |||||||||||||||||||
| Average Annual Return, Percent | 0.45% | 7.51% | ||||||||||||||||||||||||||||||||||||||
| C000252253 [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust WCM International Equity ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 16,360 | 16,360 | 16,360 | 16,360 | 16,360 | 16,360 | $ 16,360 | 16,360 | 16,360 | 16,360 | 16,360 | 15,842 | 15,809 | 15,291 | 13,888 | 13,297 | 16,009 | 15,500 | 14,381 | 11,680 | 10,000 | |||||||||||||||||||
| Average Annual Return, Percent | 3.48% | 10.91% | ||||||||||||||||||||||||||||||||||||||
| Russell 3000 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 32,604 | 32,604 | 32,604 | 32,604 | 32,604 | 32,604 | $ 32,604 | $ 32,604 | 32,604 | 32,604 | $ 32,604 | 29,924 | 26,345 | 24,290 | 20,909 | 20,419 | 25,879 | 23,705 | 20,593 | 16,443 | 17,036 | 15,435 | 13,002 | 14,163 | 13,721 | 12,339 | 11,327 | 10,412 | 10,048 | 10,194 | 10,000 | |||||||||
| Average Annual Return, Percent | 23.81% | 13.86% | 12.55% | |||||||||||||||||||||||||||||||||||||
| Standard & Poor's 500 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 34,254 | $ 34,254 | $ 34,254 | $ 34,254 | $ 34,254 | $ 34,254 | 34,254 | $ 34,254 | $ 34,254 | $ 34,254 | $ 34,254 | 31,586 | 27,396 | 10,000 | 25,356 | 10,000 | 21,692 | 10,000 | 21,202 | 26,489 | 23,721 | 10,000 | 10,000 | 20,582 | 16,848 | 17,383 | 15,672 | 13,221 | 10,000 | 14,193 | 13,827 | 10,000 | 12,410 | 11,350 | 10,527 | 10,138 | 10,123 | 10,000 | ||
| Average Annual Return, Percent | 25.02% | 24.91% | 28.28% | 23.18% | 13.25% | 13.03% | 14.53% | 13.84% | 14.36% | 13.10% | ||||||||||||||||||||||||||||||
| Russell 1000 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 1000® Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 33,560 | $ 33,560 | $ 33,560 | $ 33,560 | $ 33,560 | $ 33,560 | 33,560 | $ 33,560 | $ 33,560 | $ 33,560 | $ 33,560 | 30,792 | 26,954 | 24,856 | 21,303 | 20,824 | 26,339 | 23,942 | 20,828 | 16,735 | 17,219 | 15,570 | 13,102 | 14,152 | 13,760 | 12,356 | 11,308 | 10,469 | 10,092 | 10,171 | 10,000 | |||||||||
| Average Annual Return, Percent | 24.51% | 14.28% | 12.87% | |||||||||||||||||||||||||||||||||||||
| MSCI Emerging Markets Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI Emerging Markets Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 14,238 | 14,238 | 14,238 | 14,238 | 14,238 | 14,238 | $ 14,238 | $ 14,238 | 14,238 | 14,238 | $ 14,238 | 14,236 | 13,244 | 12,649 | 12,059 | 12,431 | 15,091 | 16,638 | 15,485 | 11,808 | 10,000 | |||||||||||||||||||
| Average Annual Return, Percent | 7.50% | 7.72% | ||||||||||||||||||||||||||||||||||||||
| MSCI ACWI ex USA Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI ex-USA Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,954 | 15,954 | 15,954 | 15,954 | 15,954 | 15,954 | $ 15,954 | 15,954 | 15,954 | 15,954 | 15,954 | 15,978 | 15,117 | 14,314 | 13,075 | 12,699 | 15,567 | 15,760 | 14,437 | 11,612 | $ 10,000 | |||||||||||||||||||
| Average Annual Return, Percent | 5.53% | 10.33% | ||||||||||||||||||||||||||||||||||||||
| Dow Jones Select MicroCap IndexSM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones Select MicroCap IndexSM | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 25,514 | 25,514 | 25,514 | 25,514 | 25,514 | 25,514 | $ 25,514 | $ 25,514 | 25,514 | 25,514 | $ 25,514 | 22,248 | 22,492 | 20,330 | 19,782 | 18,478 | 22,238 | 21,254 | 16,400 | 13,096 | 16,898 | 14,790 | 13,198 | 16,297 | 15,029 | 13,900 | 13,783 | 10,402 | 10,121 | 10,550 | 10,000 | |||||||||
| Average Annual Return, Percent | 13.43% | 8.60% | 9.82% | |||||||||||||||||||||||||||||||||||||
| Russell 2000 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2000® Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 21,223 | 21,223 | 21,223 | 21,223 | 21,223 | 21,223 | 21,223 | $ 21,223 | 21,223 | 21,223 | $ 21,223 | 19,348 | 19,025 | 17,592 | 16,275 | 15,663 | 20,456 | 20,940 | 17,815 | 12,921 | 14,847 | 13,836 | 11,828 | 14,312 | 13,294 | 12,174 | 11,595 | 9,770 | 9,558 | 10,475 | 10,000 | |||||||||
| Average Annual Return, Percent | 11.54% | 7.40% | 7.82% | |||||||||||||||||||||||||||||||||||||
| Morningstar Dividend Leaders IndexSM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Morningstar® Dividend Leaders IndexSM | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 26,163 | 26,163 | 26,163 | 26,163 | 26,163 | 26,163 | 26,163 | $ 26,163 | 26,163 | 26,163 | $ 26,163 | 24,107 | 22,269 | 20,555 | 21,537 | 20,228 | 20,111 | 18,329 | 16,018 | 13,375 | 16,662 | 15,264 | 13,316 | 13,655 | 14,087 | 12,920 | 12,519 | 11,872 | 10,318 | 9,718 | 10,000 | |||||||||
| Average Annual Return, Percent | 17.49% | 9.45% | 10.10% | |||||||||||||||||||||||||||||||||||||
| Russell 1000 Value Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 1000® Value Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 22,580 | 22,580 | 22,580 | 22,580 | 22,580 | 22,580 | 22,580 | $ 22,580 | 22,580 | 22,580 | $ 22,580 | 21,044 | 19,741 | 18,622 | 17,715 | 16,695 | 19,159 | 17,917 | 15,307 | 12,470 | 14,891 | 13,679 | 11,768 | 12,612 | 12,829 | 11,812 | 11,286 | 10,224 | 9,618 | 9,939 | 10,000 | |||||||||
| Average Annual Return, Percent | 14.37% | 8.68% | 8.49% | |||||||||||||||||||||||||||||||||||||
| IPOX 100 U S Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | IPOX®-100 U.S. Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 26,428 | 26,428 | 26,428 | 26,428 | 26,428 | 26,428 | 26,428 | $ 26,428 | 26,428 | 26,428 | $ 26,428 | 21,876 | 21,025 | 19,287 | 17,141 | 17,696 | 26,271 | 27,241 | 25,216 | 17,818 | 16,987 | 16,362 | 12,971 | 14,833 | 14,066 | 12,231 | 11,023 | 10,236 | 10,279 | 10,896 | 10,000 | |||||||||
| Average Annual Return, Percent | 25.71% | 9.24% | 10.21% | |||||||||||||||||||||||||||||||||||||
| Nasdaq 100 Equal WeightedTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq-100 Equal WeightedTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 32,611 | 32,611 | 32,611 | 32,611 | 32,611 | 32,611 | 32,611 | $ 32,611 | 32,611 | 32,611 | $ 32,611 | 32,058 | 30,395 | 27,489 | 22,681 | 22,236 | 29,963 | 28,251 | 25,296 | 19,929 | 18,305 | 16,445 | 13,396 | 14,747 | 14,043 | 12,867 | 11,076 | 10,018 | 10,289 | 10,267 | 10,000 | |||||||||
| Average Annual Return, Percent | 7.31% | 12.24% | 12.55% | |||||||||||||||||||||||||||||||||||||
| Nasdaq 100 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq-100 Index® | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 54,753 | 54,753 | 54,753 | 54,753 | 54,753 | 54,753 | 54,753 | $ 54,753 | 54,753 | 54,753 | $ 54,753 | 51,103 | 43,503 | 39,079 | 28,044 | 29,353 | 41,471 | 36,863 | 32,524 | 25,537 | 21,847 | 19,089 | 15,666 | 17,328 | 15,660 | 13,751 | 11,775 | 10,628 | 10,976 | 10,442 | 10,000 | |||||||||
| Average Annual Return, Percent | 25.88% | 20.18% | 18.53% | |||||||||||||||||||||||||||||||||||||
| Nasdaq 100 Technology SectorTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq-100 Technology SectorTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 48,508 | 48,508 | 48,508 | 48,508 | 48,508 | 48,508 | 48,508 | $ 48,508 | 48,508 | 48,508 | $ 48,508 | 50,824 | 45,033 | 37,681 | 26,829 | 29,026 | 44,328 | 40,072 | 34,706 | 27,302 | 24,845 | 21,075 | 16,640 | 18,688 | 17,360 | 14,945 | 12,518 | 10,248 | 9,921 | 9,780 | 10,000 | |||||||||
| Average Annual Return, Percent | 7.72% | 14.32% | 17.11% | |||||||||||||||||||||||||||||||||||||
| S And P 500 Information Technology Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Information Technology Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 75,198 | 75,198 | 75,198 | 75,198 | 75,198 | 75,198 | 75,198 | $ 75,198 | 75,198 | 75,198 | $ 75,198 | 70,587 | 55,043 | 49,790 | 34,874 | 35,499 | 48,569 | 41,070 | 36,102 | 28,842 | 25,091 | 21,224 | 16,695 | 18,562 | 16,742 | 14,137 | 12,059 | 10,559 | 10,593 | 10,076 | 10,000 | |||||||||
| Average Annual Return, Percent | 36.61% | 24.55% | 22.35% | |||||||||||||||||||||||||||||||||||||
| NYSE Arca Biotechnology Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | NYSE® Arca® Biotechnology Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 17,214 | 17,214 | 17,214 | 17,214 | 17,214 | 17,214 | 17,214 | $ 17,214 | 17,214 | 17,214 | $ 17,214 | 15,826 | 16,198 | 15,602 | 15,750 | 13,777 | 16,407 | 17,523 | 17,006 | 16,918 | 14,974 | 14,128 | 12,434 | 13,977 | 12,401 | 11,320 | 9,006 | 8,847 | 11,139 | 12,188 | 10,000 | |||||||||
| Average Annual Return, Percent | 6.28% | 2.83% | 5.58% | |||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Health Care Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Health Care Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 24,076 | 24,076 | 24,076 | 24,076 | 24,076 | 24,076 | 24,076 | $ 24,076 | 24,076 | 24,076 | $ 24,076 | 25,177 | 23,425 | 22,712 | 22,983 | 21,588 | 23,767 | 21,285 | 19,037 | 16,515 | 16,618 | 14,904 | 13,749 | 13,307 | 12,884 | 12,253 | 10,520 | 10,803 | 10,741 | 11,020 | 10,000 | |||||||||
| Average Annual Return, Percent | 2.81% | 7.70% | 9.18% | |||||||||||||||||||||||||||||||||||||
| Nasdaq Biotechnology Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq® Biotechnology Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 14,410 | 14,410 | 14,410 | 14,410 | 14,410 | 14,410 | 14,410 | $ 14,410 | 14,410 | 14,410 | $ 14,410 | 15,138 | 14,491 | 13,466 | 13,855 | 12,284 | 15,415 | 16,730 | 15,412 | 13,881 | 12,190 | 11,005 | 9,743 | 11,027 | 10,691 | 10,314 | 8,790 | 8,522 | 11,176 | 12,179 | 10,000 | |||||||||
| Average Annual Return, Percent | (0.57%) | 3.40% | 3.72% | |||||||||||||||||||||||||||||||||||||
| Dow Jones Internet Composite IndexSM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones Internet Composite IndexSM | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 41,871 | 41,871 | 41,871 | 41,871 | 41,871 | 41,871 | 41,871 | $ 41,871 | 41,871 | 41,871 | $ 41,871 | 35,156 | 31,937 | 27,849 | 20,983 | 21,594 | 38,314 | 41,386 | 35,813 | 28,687 | 23,330 | 24,029 | 19,428 | 22,864 | 18,195 | 15,656 | 13,152 | 11,856 | 12,240 | 10,989 | 10,000 | |||||||||
| Average Annual Return, Percent | 31.12% | 12.41% | 15.40% | |||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Information Technology Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Information Technology Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 72,683 | 72,683 | 72,683 | 72,683 | 72,683 | 72,683 | 72,683 | $ 72,683 | 72,683 | 72,683 | $ 72,683 | 68,309 | 53,471 | 48,521 | 34,167 | 34,680 | 47,403 | 40,266 | 35,427 | 28,128 | 24,734 | 20,977 | 16,517 | 18,395 | 16,641 | 14,136 | 12,121 | 10,566 | 10,560 | 10,130 | 10,000 | |||||||||
| Average Annual Return, Percent | 35.93% | 24.06% | 21.94% | |||||||||||||||||||||||||||||||||||||
| The Capital Strength IndexTM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Capital Strength IndexTM | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 27,973 | 27,973 | 27,973 | 27,973 | 27,973 | 27,973 | 27,973 | $ 27,973 | 27,973 | 27,973 | $ 27,973 | 26,503 | 25,019 | 23,227 | 22,914 | 21,188 | 25,397 | 22,509 | 19,940 | 17,124 | 17,522 | 16,204 | 13,732 | 14,397 | 14,234 | 12,609 | 11,183 | 10,817 | 10,231 | 10,015 | 10,000 | |||||||||
| Average Annual Return, Percent | 11.81% | 9.81% | 10.83% | |||||||||||||||||||||||||||||||||||||
| Nasdaq 100 Ex Tech SectorTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq-100 Ex-Tech SectorTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 26,140 | 26,140 | 26,140 | 26,140 | 26,140 | 26,140 | 26,140 | $ 26,140 | 26,140 | 26,140 | $ 26,140 | 24,535 | 24,384 | 23,137 | 20,825 | 19,167 | 23,804 | 23,104 | 21,154 | 16,658 | 15,404 | 14,352 | 11,926 | 12,993 | 12,562 | 11,889 | 10,371 | 9,928 | 10,546 | 10,578 | 10,000 | |||||||||
| Average Annual Return, Percent | 7.19% | 11.15% | 10.09% | |||||||||||||||||||||||||||||||||||||
| The Dividend StrengthTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Dividend StrengthTM Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [1],[2] | 11.89% | ||||||||||||||||||||||||||||||||||||||
| Dow Jones U S Select Dividend Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones U.S. Select Dividend Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | 16.62% | 8.86% | 9.38% | |||||||||||||||||||||||||||||||||||||
| S And P 500 Value Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Value Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 25,950 | 25,950 | 25,950 | 25,950 | 25,950 | 25,950 | 25,950 | $ 25,950 | 25,950 | 25,950 | $ 25,950 | 24,453 | 23,115 | 21,208 | 18,910 | 17,675 | 19,951 | 18,577 | 15,974 | 13,314 | 15,760 | 13,941 | 11,946 | 12,829 | 13,120 | 11,924 | 11,373 | 10,292 | 9,687 | 9,955 | 10,000 | |||||||||
| Average Annual Return, Percent | 12.29% | 10.49% | 10.01% | |||||||||||||||||||||||||||||||||||||
| Value Line Dividend Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Value Line® Dividend Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 24,450 | 24,450 | 24,450 | 24,450 | 24,450 | 24,450 | 24,450 | $ 24,450 | 24,450 | 24,450 | $ 24,450 | 22,532 | 22,075 | 21,488 | 21,052 | 20,159 | 22,068 | 20,135 | 17,535 | 14,920 | 17,365 | 15,999 | 13,606 | 13,935 | 13,990 | 13,067 | 12,345 | 11,697 | 10,209 | 9,830 | 10,000 | |||||||||
| Average Annual Return, Percent | 10.74% | 7.08% | 9.35% | |||||||||||||||||||||||||||||||||||||
| Dow Jones U S Select Dividend Index SM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones U.S. Select Dividend IndexSM | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 24,520 | 24,520 | 24,520 | 24,520 | 24,520 | 24,520 | 24,520 | $ 24,520 | 24,520 | 24,520 | $ 24,520 | 22,084 | 21,026 | 19,815 | 20,710 | 19,724 | 20,242 | 18,932 | 15,306 | 12,561 | 16,038 | 14,805 | 13,028 | 13,994 | 13,853 | 12,731 | 12,000 | 11,367 | 9,837 | 9,643 | 10,000 | |||||||||
| Average Annual Return, Percent | 16.62% | 8.86% | 9.38% | |||||||||||||||||||||||||||||||||||||
| Nasdaq Clean Edge Green EnergyTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq® Clean Edge® Green EnergyTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 21,364 | 21,364 | 21,364 | 21,364 | 21,364 | 21,364 | 21,364 | $ 21,364 | 21,364 | 21,364 | $ 21,364 | 21,326 | 26,329 | 31,860 | 29,227 | 32,227 | 41,843 | 42,489 | 42,979 | 18,075 | 15,089 | 12,746 | 10,577 | 11,598 | 12,035 | 10,668 | 9,114 | 8,423 | 9,362 | 10,734 | 10,000 | |||||||||
| Average Annual Return, Percent | (18.87%) | 7.20% | 7.89% | |||||||||||||||||||||||||||||||||||||
| S And P United States REIT Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P United States REIT Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 17,155 | 17,155 | 17,155 | 17,155 | 17,155 | 17,155 | 17,155 | $ 17,155 | 17,155 | 17,155 | $ 17,155 | 15,766 | 15,821 | 14,664 | 13,906 | 14,672 | 18,386 | 15,642 | 12,853 | 11,350 | 13,899 | 13,038 | 11,168 | 11,767 | 11,608 | 11,356 | 11,126 | 11,617 | 10,254 | 9,390 | 10,000 | |||||||||
| Average Annual Return, Percent | 8.44% | 4.30% | 5.55% | |||||||||||||||||||||||||||||||||||||
| FTSE EPRA NAREIT North America Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | FTSE EPRA/NAREIT North America Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 16,179 | 16,179 | 16,179 | 16,179 | 16,179 | 16,179 | 16,179 | $ 16,179 | 16,179 | 16,179 | $ 16,179 | 14,912 | 15,070 | 14,032 | 13,333 | 14,103 | 17,739 | 15,195 | 12,440 | 10,891 | 13,782 | 12,931 | 11,069 | 11,702 | 11,517 | 11,213 | 11,014 | 11,517 | 10,181 | 9,394 | 10,000 | |||||||||
| Average Annual Return, Percent | 7.36% | 3.26% | 4.93% | |||||||||||||||||||||||||||||||||||||
| ISE Revere Natural GasTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ISE-Revere Natural GasTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 5,622 | 5,622 | 5,622 | 5,622 | 5,622 | 5,622 | 5,622 | $ 5,622 | 5,622 | 5,622 | $ 5,622 | 5,897 | 5,373 | 5,054 | 5,203 | 4,552 | 3,514 | 3,298 | 1,755 | 1,453 | 2,389 | 2,823 | 2,818 | 4,456 | 4,304 | 3,860 | 4,829 | 4,461 | 4,032 | 8,451 | 10,000 | |||||||||
| Average Annual Return, Percent | 4.68% | 18.68% | (5.60%) | |||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Energy Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Energy Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,286 | 15,286 | 15,286 | 15,286 | 15,286 | 15,286 | 15,286 | $ 15,286 | 15,286 | 15,286 | $ 15,286 | 15,957 | 14,427 | 13,745 | 14,519 | 11,605 | 8,862 | 8,405 | 5,712 | 5,504 | 8,629 | 8,805 | 7,841 | 10,439 | 9,717 | 8,549 | 9,920 | 9,006 | 7,793 | 9,531 | 10,000 | |||||||||
| Average Annual Return, Percent | 5.98% | 12.11% | 4.34% | |||||||||||||||||||||||||||||||||||||
| ISE Clean Edge WaterTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ISE Clean Edge WaterTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 34,584 | 34,584 | 34,584 | 34,584 | 34,584 | 34,584 | 34,584 | $ 34,584 | 34,584 | 34,584 | $ 34,584 | 33,608 | 31,739 | 29,429 | 26,213 | 23,631 | 30,890 | 26,948 | 23,175 | 17,782 | 18,972 | 17,249 | 13,755 | 14,940 | 15,048 | 13,185 | 12,071 | 10,690 | 9,075 | 9,366 | 10,000 | |||||||||
| Average Annual Return, Percent | 8.95% | 12.76% | 13.21% | |||||||||||||||||||||||||||||||||||||
| Nasdaq OMX ABA Community BankTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq OMX® ABA Community BankTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 19,904 | 19,904 | 19,904 | 19,904 | 19,904 | 19,904 | 19,904 | $ 19,904 | 19,904 | 19,904 | $ 19,904 | 16,250 | 17,270 | 13,432 | 17,609 | 16,408 | 19,180 | 17,740 | 14,207 | 11,032 | 15,850 | 14,439 | 12,824 | 16,034 | 15,210 | 14,552 | 15,030 | 10,701 | 10,853 | 10,948 | 10,000 | |||||||||
| Average Annual Return, Percent | 15.24% | 4.66% | 7.13% | |||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Financials Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Financials Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 29,257 | 29,257 | 29,257 | 29,257 | 29,257 | 29,257 | 29,257 | $ 29,257 | 29,257 | 29,257 | $ 29,257 | 24,645 | 22,542 | 19,900 | 20,189 | 18,377 | 22,471 | 20,903 | 16,701 | 12,970 | 17,025 | 15,204 | 12,975 | 14,415 | 14,919 | $ 13,109 | $ 12,340 | $ 9,768 | $ 9,929 | $ 10,023 | $ 10,000 | |||||||||
| Average Annual Return, Percent | 29.78% | 11.44% | 11.33% | |||||||||||||||||||||||||||||||||||||
| Dow Jones Industrial Average Equal Weight Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones Industrial Average® Equal Weight Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 21,828 | 21,828 | 21,828 | 21,828 | 21,828 | 21,828 | 21,828 | $ 21,828 | 21,828 | $ 21,828 | $ 21,828 | 19,936 | 19,186 | 17,464 | 16,486 | 15,372 | 17,753 | 16,922 | 14,874 | 12,576 | 13,849 | 12,739 | 11,079 | 11,069 | 11,124 | 10,000 | ||||||||||||||
| Average Annual Return, Percent | 13.77% | 9.53% | 11.13% | |||||||||||||||||||||||||||||||||||||
| Dow Jones Industrial AverageTM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones Industrial AverageTM | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 22,579 | 22,579 | 22,579 | 22,579 | 22,579 | 22,579 | 22,579 | $ 22,579 | 22,579 | $ 22,579 | 22,579 | 20,578 | 19,637 | 17,736 | 16,901 | 15,526 | 18,146 | 17,072 | 15,004 | 12,521 | 13,674 | 12,588 | 10,908 | $ 11,219 | $ 11,302 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 14.99% | 10.55% | 11.64% | |||||||||||||||||||||||||||||||||||||
| Lunt Capital Large Cap Factor Rotation Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Lunt Capital Large Cap Factor Rotation Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 18,174 | 18,174 | 18,174 | 18,174 | 18,174 | 18,174 | 18,174 | $ 18,174 | $ 18,174 | $ 18,174 | 18,174 | 16,954 | 15,076 | 14,140 | 14,862 | 14,313 | 18,540 | 18,031 | 15,184 | 12,168 | 11,578 | 10,901 | 8,813 | 10,000 | ||||||||||||||||
| Average Annual Return, Percent | 20.54% | 9.44% | 9.73% | |||||||||||||||||||||||||||||||||||||
| Nasdaq US 500 Large Cap TM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq US 500 Large CapTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 23,137 | 23,137 | 23,137 | 23,137 | 23,137 | 23,137 | 23,137 | $ 23,137 | $ 23,137 | 23,137 | 23,137 | 21,227 | 18,420 | 16,997 | 14,488 | 14,185 | 17,985 | 16,261 | $ 14,220 | $ 11,509 | $ 11,711 | $ 10,567 | $ 8,869 | $ 10,000 | ||||||||||||||||
| Average Annual Return, Percent | 25.61% | 14.59% | 13.92% | |||||||||||||||||||||||||||||||||||||
| LBMA Gold Price [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | LBMA Gold Price | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 14,053 | 14,053 | 14,053 | 14,053 | $ 14,053 | $ 14,053 | 14,053 | $ 14,053 | $ 14,053 | 14,053 | 14,053 | 12,555 | 11,195 | 10,301 | 9,773 | $ 9,779 | $ 9,814 | $ 9,478 | $ 10,000 | $ 10,000 | ||||||||||||||||||||
| Average Annual Return, Percent | 25.53% | 11.42% | 9.01% | |||||||||||||||||||||||||||||||||||||
| Indxx US Aerospace And Defense Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Indxx US Aerospace & Defense Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,046 | 15,046 | 15,046 | $ 15,046 | $ 15,046 | $ 15,046 | 15,046 | 15,046 | 15,046 | 15,046 | 15,046 | 13,738 | 12,413 | 11,259 | 10,740 | 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 21.22% | 20.57% | ||||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Aerospace And Defense Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Aerospace & Defense Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 13,689 | 13,689 | 13,689 | $ 13,689 | 13,689 | 13,689 | 13,689 | 13,689 | 13,689 | 13,689 | 13,689 | 12,630 | 11,872 | 11,033 | 10,923 | 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 15.30% | 15.46% | ||||||||||||||||||||||||||||||||||||||
| The Growth StrengthTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Growth Strength™ Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,859 | 15,859 | 15,859 | $ 15,859 | 15,859 | 15,859 | 15,859 | 15,859 | 15,859 | 15,859 | 15,859 | 15,316 | 13,600 | 11,661 | $ 10,113 | $ 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 16.62% | 23.52% | ||||||||||||||||||||||||||||||||||||||
| Bloomberg Inflation Sensitive Equity Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Inflation Sensitive Equity Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,491 | 11,491 | $ 11,491 | $ 11,491 | 11,491 | 11,491 | 11,491 | 11,491 | 11,491 | 11,491 | 11,491 | 11,921 | 11,366 | $ 10,474 | $ 10,000 | |||||||||||||||||||||||||
| Average Annual Return, Percent | 1.10% | 8.01% | ||||||||||||||||||||||||||||||||||||||
| S And P 500 Sector Neutral FCF Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Sector-Neutral FCF Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 12,374 | $ 11,445 | $ 11,048 | $ 10,000 | ||||||||||||||||||||||||||
| Average Annual Return, Percent | 11.99% | 17% | ||||||||||||||||||||||||||||||||||||||
| [1]Because the Fund’s underlying index has an inception date of March 7, 2022, performance data for the Index is not available for all periods shown in the table because performance data does not exist for some of the entire periods.[2]On April 29, 2022, the Fund’s underlying index changed from the Nasdaq AlphaDEX ® TM | ||||||||||||||||||||||||||||||||||||||||
| Shareholder Report, Holdings (Details) | Dec. 31, 2024 |
| C000029773 [Member] | Turning Point Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000029773 [Member] | Vimeo Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000029773 [Member] | Solaris Energy Infrastructure Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000029773 [Member] | Centrus Energy Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000029773 [Member] | Limbach Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000029773 [Member] | Mizuho Financial Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000029773 [Member] | RBC Dominion Securities Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000029773 [Member] | BJ s Restaurants Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000029773 [Member] | Central Pacific Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000029773 [Member] | Hackett Group The Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000029773 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000029773 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.70% |
| C000029773 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000029773 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.30% |
| C000029773 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000029773 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20% |
| C000029773 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000029773 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000029773 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000029773 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000030350 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000030350 [Member] | Verizon Communications Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000030350 [Member] | Chevron Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000030350 [Member] | Pfizer Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000030350 [Member] | Philip Morris International Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000030350 [Member] | Altria Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000030350 [Member] | International Business Machines Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000030350 [Member] | United Parcel Service Inc Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000030350 [Member] | Gilead Sciences Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000030350 [Member] | Duke Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030350 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| C000030350 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.60% |
| C000030350 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.10% |
| C000030350 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000030350 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.10% |
| C000030350 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000030350 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000030350 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000030350 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13% |
| C000030350 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.80% |
| C000030351 [Member] | Palantir Technologies Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000030351 [Member] | AppLovin Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000030351 [Member] | Carrier Global Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000030351 [Member] | Samsara Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000030351 [Member] | DoorDash Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000030351 [Member] | GE Vernova Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000030351 [Member] | Constellation Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000030351 [Member] | Kenvue Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000030351 [Member] | Duolingo Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000030351 [Member] | CrowdStrike Holdings Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030351 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000030351 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.90% |
| C000030351 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000030351 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000030351 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000030351 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.90% |
| C000030351 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 29.60% |
| C000030351 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000030351 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000030351 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000030477 [Member] | Diamondback Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Biogen Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Starbucks Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Microchip Technology Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | GLOBALFOUNDRIES Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Intel Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Coca Cola Europacific Partners PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Baker Hughes Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Exelon Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000030477 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.10% |
| C000030477 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000030477 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000030477 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000030477 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 40.60% |
| C000030477 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000030477 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000030477 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10% |
| C000030477 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030478 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030478 [Member] | Microchip Technology Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030478 [Member] | GLOBALFOUNDRIES Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030478 [Member] | Intel Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030478 [Member] | Advanced Micro Devices Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000030478 [Member] | Lam Research Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000030478 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000030478 [Member] | Texas Instruments Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000030478 [Member] | Analog Devices Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000030478 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000030478 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000030478 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 89.80% |
| C000030478 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000030478 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030478 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000033929 [Member] | Gilead Sciences Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000033929 [Member] | Exelixis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000033929 [Member] | ACADIA Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000033929 [Member] | Natera Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000033929 [Member] | Neurocrine Biosciences Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000033929 [Member] | Argenx SE ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000033929 [Member] | Corcept Therapeutics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000033929 [Member] | Intra Cellular Therapies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000033929 [Member] | Incyte Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000033929 [Member] | Repligen Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000033929 [Member] | Biotechnology [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 76% |
| C000033929 [Member] | Life Sciences Tools And Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.30% |
| C000033929 [Member] | Pharmaceuticals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000033929 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000033930 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10% |
| C000033930 [Member] | Meta Platforms Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000033930 [Member] | Netflix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000033930 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000033930 [Member] | Alphabet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000033930 [Member] | Arista Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000033930 [Member] | Cisco Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000033930 [Member] | Alphabet Inc Class C [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000033930 [Member] | Booking Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000033930 [Member] | PayPal Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000033930 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000033930 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000033930 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.10% |
| C000033930 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000033930 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.90% |
| C000033930 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 29.60% |
| C000033930 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000033930 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000034137 [Member] | Cisco Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Walmart Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034137 [Member] | Visa Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034137 [Member] | Snap on Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Costco Wholesale Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | TJX The Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Packaging Corp of America [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Mastercard Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000034137 [Member] | Blackrock Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000034137 [Member] | Ameriprise Financial Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000034137 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000034137 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.40% |
| C000034137 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000034137 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000034137 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000034137 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.60% |
| C000034137 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| C000034137 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000034137 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000034137 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000035622 [Member] | Diamondback Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000035622 [Member] | Biogen Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000035622 [Member] | Starbucks Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000035622 [Member] | Coca Cola Europacific Partners PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Baker Hughes Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Exelon Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Monster Beverage Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Regeneron Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Ross Stores Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Vertex Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000035622 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18% |
| C000035622 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.80% |
| C000035622 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.50% |
| C000035622 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.40% |
| C000035622 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000035622 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000035622 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000035622 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000037851 [Member] | Snap on Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Garmin Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000037851 [Member] | Wyndham Hotels And Resorts Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000037851 [Member] | Unum Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000037851 [Member] | Cullen Frost Bankers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000037851 [Member] | Coterra Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000037851 [Member] | Commerce Bancshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Home BancShares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Dick s Sporting Goods Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | East West Bancorp Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.50% |
| C000037851 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.90% |
| C000037851 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000037851 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.10% |
| C000037851 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000037851 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.30% |
| C000037851 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.80% |
| C000037851 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000037851 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000037851 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000037913 [Member] | Starbucks Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Maximus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Target Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Cal Maine Foods Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | America Movil S A B de C V ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Spire Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Southwest Gas Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Enbridge Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Toyota Motor Corp ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Honda Motor Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.80% |
| C000037913 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000037913 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000037913 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.40% |
| C000037913 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.70% |
| C000037913 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.80% |
| C000037913 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000037913 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000037913 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000037913 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000041643 [Member] | RBC Dominion Securities Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000041643 [Member] | Tesla Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.10% |
| C000041643 [Member] | Rivian Automotive Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000041643 [Member] | ON Semiconductor Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000041643 [Member] | First Solar Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000041643 [Member] | Albemarle Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000041643 [Member] | Lucid Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000041643 [Member] | Bank of America Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000041643 [Member] | Enphase Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000041643 [Member] | Acuity Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000041643 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000041643 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000041643 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.60% |
| C000041643 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.40% |
| C000041643 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.50% |
| C000041643 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000041643 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000041643 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000041643 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000047557 [Member] | Prologis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.50% |
| C000047557 [Member] | Equinix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000047557 [Member] | Welltower Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000047557 [Member] | Digital Realty Trust Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000047557 [Member] | Simon Property Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000047557 [Member] | Public Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000047557 [Member] | Realty Income Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000047557 [Member] | Extra Space Storage Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000047557 [Member] | AvalonBay Communities Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000047557 [Member] | Iron Mountain Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000047557 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000047557 [Member] | Retail REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17% |
| C000047557 [Member] | Health Care REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.70% |
| C000047557 [Member] | Industrial REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| C000047557 [Member] | Data Center REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000047557 [Member] | Multi Family Residential REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000047557 [Member] | Other Specialized REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.50% |
| C000047557 [Member] | Self Storage REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000047557 [Member] | Single Family Residential REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000047557 [Member] | Office REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000047627 [Member] | Diamondback Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000047627 [Member] | Coterra Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000047627 [Member] | Hess Midstream L P Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000047627 [Member] | Western Midstream Partners L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000047627 [Member] | Occidental Petroleum Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000047627 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000047627 [Member] | EQT Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000047627 [Member] | EOG Resources Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000047627 [Member] | Expand Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000047627 [Member] | APA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000047627 [Member] | Oil And Gas Storage And Transportation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000047627 [Member] | Integrated Oil And Gas [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000047627 [Member] | Gas Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000047627 [Member] | Oil and Gas Exploration and Production Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 82.80% |
| C000047627 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000047627 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000047628 [Member] | IDEX Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000047628 [Member] | Waters Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000047628 [Member] | Pentair PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000047628 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000047628 [Member] | Roper Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000047628 [Member] | AECOM [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000047628 [Member] | Ecolab Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000047628 [Member] | Veralto Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000047628 [Member] | American Water Works Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000047628 [Member] | IDEXX Laboratories Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000047628 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.10% |
| C000047628 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000047628 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 54.40% |
| C000047628 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000047628 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000047628 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.90% |
| C000047628 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000047628 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000078718 [Member] | Commerce Bancshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000078718 [Member] | Wintrust Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000078718 [Member] | UMB Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000078718 [Member] | First Financial Bankshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000078718 [Member] | United Bankshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000078718 [Member] | Bank OZK [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000078718 [Member] | Hancock Whitney Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000078718 [Member] | International Bancshares Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000078718 [Member] | BancFirst Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000078718 [Member] | Texas Capital Bancshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000078718 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000078718 [Member] | Banks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 97.40% |
| C000078718 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000078718 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000191287 [Member] | Cisco Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000191287 [Member] | Visa Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000191287 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Three M Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Coca Cola The Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Honeywell International Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Boeing The Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000191287 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000191287 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000191287 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.90% |
| C000191287 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.30% |
| C000191287 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000191287 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10% |
| C000191287 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.70% |
| C000191287 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20% |
| C000191287 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000191287 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000191287 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000201408 [Member] | Palantir Technologies Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000201408 [Member] | AppLovin Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000201408 [Member] | Vistra Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000201408 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000201408 [Member] | United Airlines Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000201408 [Member] | Paychex Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000201408 [Member] | Broadridge Financial Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000201408 [Member] | Stryker Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000201408 [Member] | Automatic Data Processing Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000201408 [Member] | General Motors Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000201408 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000201408 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.20% |
| C000201408 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000201408 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000201408 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000201408 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.10% |
| C000201408 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13% |
| C000201408 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000201408 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000201408 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000222996 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| C000222996 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000222996 [Member] | US Treasury Bill Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 145.30% |
| C000222996 [Member] | Purchased Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000222996 [Member] | Written Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (46.70%) |
| C000222996 [Member] | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.30%) |
| C000222997 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| C000222997 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000222997 [Member] | US Treasury Bill Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| C000222997 [Member] | Purchased Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000222997 [Member] | Written Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000222997 [Member] | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000238091 [Member] | Boeing The Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000238091 [Member] | RTX Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000238091 [Member] | TransDigm Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000238091 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000238091 [Member] | Lockheed Martin Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000238091 [Member] | Howmet Aerospace Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000238091 [Member] | Curtiss Wright Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000238091 [Member] | HEICO Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000238091 [Member] | Northrop Grumman Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000238091 [Member] | Textron Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000238091 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.20% |
| C000238091 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000238091 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000238354 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000238354 [Member] | Netflix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000238354 [Member] | Arista Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000238354 [Member] | Visa Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000238354 [Member] | Deckers Outdoor Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000238354 [Member] | Expedia Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000238354 [Member] | Cadence Design Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000238354 [Member] | Live Nation Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000238354 [Member] | Dexcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000238354 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000238354 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000238354 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26% |
| C000238354 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000238354 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000238354 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000238354 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.50% |
| C000238354 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.20% |
| C000238354 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000238354 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000241319 [Member] | Packaging Corp of America [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000241319 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000241319 [Member] | RTX Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000241319 [Member] | Keysight Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000241319 [Member] | Cummins Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000241319 [Member] | International Paper Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000241319 [Member] | Quanta Services Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000241319 [Member] | CRH PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000241319 [Member] | Jones Lang LaSalle Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000241319 [Member] | Westinghouse Air Brake Technologies Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000241319 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000241319 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.50% |
| C000241319 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000241319 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.10% |
| C000241319 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.60% |
| C000241319 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000244355 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000244355 [Member] | Warner Bros Discovery Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000244355 [Member] | Skyworks Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000244355 [Member] | Gen Digital Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000244355 [Member] | Hewlett Packard Enterprise Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000244355 [Member] | Jabil Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000244355 [Member] | HP Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000244355 [Member] | Synchrony Financial [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000244355 [Member] | EPAM Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000244355 [Member] | F5 Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000244355 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000244355 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000244355 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000244355 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.50% |
| C000244355 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000244355 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000244355 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.20% |
| C000244355 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000244355 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000244355 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10% |
| C000252251 [Member] | United Overseas Bank Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000252251 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000252251 [Member] | Nippon Paint Holdings Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000252251 [Member] | Grupo Aeroportuario del Pacifico S A B de C V Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000252251 [Member] | AstraZeneca PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000252251 [Member] | HDFC Bank Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000252251 [Member] | TOTVS S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000252251 [Member] | Tencent Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000252251 [Member] | Bid Corp Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000252251 [Member] | B3 S A Brasil Bolsa Balcao [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000252251 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000252251 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 29.10% |
| C000252251 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000252251 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000252251 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000252251 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.70% |
| C000252251 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.70% |
| C000252251 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000252251 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000252253 [Member] | United Overseas Bank Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000252253 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000252253 [Member] | HDFC Bank Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000252253 [Member] | AstraZeneca PLC ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000252253 [Member] | Wise PLC Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000252253 [Member] | Persimmon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000252253 [Member] | Canadian National Railway Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000252253 [Member] | Haleon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000252253 [Member] | London Stock Exchange Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000252253 [Member] | Spirax Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000252253 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000252253 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.30% |
| C000252253 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000252253 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000252253 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000252253 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17% |
| C000252253 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000252253 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000252253 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000252253 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
