| Form N-CSR Cover | 12 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | First Trust Exchange-Traded Fund VI |
| Entity Central Index Key | 0001552740 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 12 Months Ended | |
| Sep. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | First Trust Exchange-Traded Fund VI | |
| Entity Central Index Key | 0001552740 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Sep. 30, 2024 | |
| C000117913 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NASDAQ Technology Dividend Index Fund | |
| Class Name | First Trust NASDAQ Technology Dividend Index Fund | |
| Trading Symbol | TDIV | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NASDAQ Technology Dividend Index Fund (the “Fund”) for the year of October 1, 2023 to September 30, 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/TDIV 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/TDIV | |
| 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 Technology Dividend Index Fund $ 0.50 % | |
| Expenses Paid, Amount | $ 61 | |
| 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 45.65% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the S&P 500 ® The Semiconductors & Semiconductor Equipment industry received the greatest allocation of any industry in the Fund with an average weight of 37.0% during the Period. The allocation to this industry contributed 21.0% to the Fund’s overall return, which was the greatest contribution of any industry to the Fund’s return during the Period. No industry had a materially 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 (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust NASDAQ Technology Dividend Index Fund 45.65 % 17.30 % 14.10 % Nasdaq Technology Dividend TM 46.66 % 18.04 % 14.83 % S&P 500 ® 36.35 % 15.98 % 13.38 % S&P 500 ® 52.68 % 26.74 % 22.40 % | |
| 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/TDIV | |
| Net Assets | $ 2,877,168,232 | |
| Holdings Count | Holding | 88 | |
| Advisory Fees Paid, Amount | $ 11,979,903 | |
| Investment Company Portfolio Turnover | 36% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 88 Total advisory fee paid $ Portfolio turnover rate 36 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings International Business Machines Corp. 8.5 % Oracle Corp. 8.4 % Broadcom, Inc. 8.2 % Microsoft Corp. 8.0 % Texas Instruments, Inc. 7.3 % QUALCOMM, Inc. 3.8 % Taiwan Semiconductor Manufacturing Co., Ltd., ADR 3.7 % Analog Devices, Inc. 2.9 % AT&T, Inc. 2.1 % Verizon Communications, Inc. 2.1 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings International Business Machines Corp. 8.5 % Oracle Corp. 8.4 % Broadcom, Inc. 8.2 % Microsoft Corp. 8.0 % Texas Instruments, Inc. 7.3 % QUALCOMM, Inc. 3.8 % Taiwan Semiconductor Manufacturing Co., Ltd., ADR 3.7 % Analog Devices, Inc. 2.9 % AT&T, Inc. 2.1 % Verizon Communications, Inc. 2.1 % | |
| C000117914 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Multi-Asset Diversified Income Index Fund | |
| Class Name | Multi-Asset Diversified Income Index Fund | |
| Trading Symbol | MDIV | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Multi-Asset Diversified Income Index Fund (the “Fund”) for the year of October 1, 2023 to September 30, 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/MDIV 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/MDIV | |
| 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 Multi-Asset Diversified Income Index Fund $ (1) 0.48 % (1) (1) Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests. | |
| Expenses Paid, Amount | $ 53 | [1] |
| Expense Ratio, Percent | 0.48% | [1] |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 21.26% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Fund seeks to invest approximately 20% of its assets in each of five categories: Equities, Real Estate Investment Trusts, Preferred Securities, Master Limited Partnerships, and a high-yield corporate debt exchange-traded fund. The most significant positive contribution came from the allocation to Equities, which contributed 7.4% to the Fund’s overall return. None of the five categories had a negative contribution to the Fund’s overall return during the Period. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year Multi-Asset Diversified Income Index Fund 21.26 % 4.11 % 3.69 % Nasdaq US Multi-Asset Diversified Income TM 21.92 % 4.67 % 4.32 % S&P 500 ® 36.35 % 15.98 % 13.38 % Dow Jones U.S. Select Dividend Index 30.90 % 10.25 % 10.48 % | |
| 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/MDIV | |
| Net Assets | $ 439,538,454 | |
| Holdings Count | Holding | 124 | |
| Advisory Fees Paid, Amount | $ 2,048,654 | |
| Investment Company Portfolio Turnover | 73% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 124 Total advisory fee paid $ Portfolio turnover rate 73 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings First Trust Tactical High Yield ETF 20.0 % Icahn Enterprises, L.P. 1.6 % PennyMac Mortgage Investment Trust 1.6 % Delek Logistics Partners, L.P. 1.3 % Alliance Resource Partners, L.P. 1.3 % Black Stone Minerals, L.P. 1.3 % Kimbell Royalty Partners, L.P. 1.2 % CrossAmerica Partners, L.P. 1.2 % Dorchester Minerals, L.P. 1.2 % Rithm Capital Corp. 1.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings First Trust Tactical High Yield ETF 20.0 % Icahn Enterprises, L.P. 1.6 % PennyMac Mortgage Investment Trust 1.6 % Delek Logistics Partners, L.P. 1.3 % Alliance Resource Partners, L.P. 1.3 % Black Stone Minerals, L.P. 1.3 % Kimbell Royalty Partners, L.P. 1.2 % CrossAmerica Partners, L.P. 1.2 % Dorchester Minerals, L.P. 1.2 % Rithm Capital Corp. 1.2 % | |
| C000125197 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust BuyWrite Income ETF | |
| Class Name | First Trust BuyWrite Income ETF | |
| Trading Symbol | FTHI | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust BuyWrite Income ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/FTHI 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/FTHI | |
| 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 BuyWrite Income ETF $ 0.76 % | |
| Expenses Paid, Amount | $ 85 | |
| Expense Ratio, Percent | 0.76% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 23.40% for the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the CBOE S&P 500 ® This outperformance was the result of the Fund’s option strategy outperforming the index-based strategy and the Fund’s equity portfolio marginally outperforming the benchmark’s equity portfolio. The overall economic backdrop during the Period was one of solid economic growth and declining inflation. During the Period, broad based economic indicators highlighting these trends were: Average Quarterly Gross Domestic Product growth in the prior four calendar quarters (third quarter 2023 – second quarter 2024) was 3.05%; Year-over-year the Consumer Price Index continued to decline, falling from 3.7% as of September 30, 2023 to 2.4% as of September 30, 2024; Year-over-year increase in real wages, as measured by the U.S. Bureau of Labor Statistics, increased by 0.9%. U.S. equities rallied strongly during the Period with only a brief pullback in mid-July/early August 2024. The S&P 500 ® ® The Fund benefitted from the economic backdrop as its equity holdings outperformed the S&P 500 ® ® The Funds “option strategy” of selling index calls on the S&P 500 ® | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust BuyWrite Income ETF 23.40 % 7.63 % 7.19 % CBOE S&P 500 ® 18.31 % 6.59 % 6.25 % S&P 500 ® 36.35 % 15.98 % 13.38 % | |
| 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. | |
| Material Change Date | Dec. 14, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTHI | |
| Net Assets | $ 930,455,028 | |
| Holdings Count | Holding | 178 | |
| Advisory Fees Paid, Amount | $ 4,197,602 | |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 178 Total advisory fee paid $ Portfolio turnover rate 44 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Microsoft Corp. 6.8 % Apple, Inc. 6.0 % NVIDIA Corp. 5.6 % Amazon.com, Inc. 3.6 % Meta Platforms, Inc., Class A 2.6 % Alphabet, Inc., Class A 2.1 % Alphabet, Inc., Class C 1.8 % Berkshire Hathaway, Inc., Class B 1.8 % Blackstone Mortgage Trust, Inc., Class A 1.7 % Broadcom, Inc. 1.7 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Microsoft Corp. 6.8 % Apple, Inc. 6.0 % NVIDIA Corp. 5.6 % Amazon.com, Inc. 3.6 % Meta Platforms, Inc., Class A 2.6 % Alphabet, Inc., Class A 2.1 % Alphabet, Inc., Class C 1.8 % Berkshire Hathaway, Inc., Class B 1.8 % Blackstone Mortgage Trust, Inc., Class A 1.7 % Broadcom, Inc. 1.7 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FTHI info ftportfolios.com Effective December 14, 2023, the Fund’s annual management fee decreased from 0.85% to 0.75% of the Fund’s average daily net assets. | |
| Material Fund Change Expenses [Text Block] | Effective December 14, 2023, the Fund’s annual management fee decreased from 0.85% to 0.75% of the Fund’s average daily net assets. | |
| 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/FTHI | |
| C000125204 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Nasdaq BuyWrite Income ETF | |
| Class Name | First Trust Nasdaq BuyWrite Income ETF | |
| Trading Symbol | FTQI | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq BuyWrite Income ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/FTQI 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/FTQI | |
| 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 BuyWrite Income ETF $ 0.76 % | |
| Expenses Paid, Amount | $ 85 | |
| Expense Ratio, Percent | 0.76% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 22.45% for the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the CBOE Nasdaq-100 BuyWrite Index SM This underperformance was the result of the Fund’s equity strategy underperforming the benchmark’s underlying equity strategy. The Fund’s option strategy outperformed the benchmark’s option strategy but not by enough to completely offset the equity underperformance. The overall economic backdrop over the Period was one of solid economic growth and declining inflation. During the Period, broad based economic indicators highlighting these trends were: Average Quarterly Gross Domestic Product Growth in the prior four calendar quarters (third quarter 2023 – second quarter 2024) was 3.05%; Year-over-year the Consumer Price Index continued to decline, falling from 3.7% as of September 30, 2023 to 2.4% as of September 30, 2024; Year-over-year increase in real wages, as measured by the U.S. Bureau of Labor Statistics, increased by 0.9%. U.S. equities rallied strongly during the Period with only a brief pullback in mid-July/early August 2024. The S&P 500 ® ® The Fund benefitted from the economic backdrop as its equity holdings rallied strongly, only slightly underperforming the underlying equity portfolio of the benchmark. On average, the Fund’s equity portfolio was slightly underweight technology and consumer discretionary stocks and overweight financials, real estate, and energy stocks. The combined impact of the sector allocations for the portfolio were slightly positive. Offsetting the positive impacts of the sector allocation was the stock selection process, which detracted from relative returns during the Period. The Fund was, on average, underweight two of the largest stocks within the benchmark, NVIDIA Corp. and Broadcom, Inc.; both of which rallied over 100% during the Period. Overall, the rest of the portfolio performed well but was not able to offset the full impact of being underweight NVIDIA and Broadcom, Inc., resulting in the overall equity portfolio slightly underperforming the benchmark equity portfolio. The Fund’s “option strategy” of selling index calls on the Index that are slightly out-of-the-money, with expirations of one, two, and three months, slightly outperformed versus the benchmark’s strategy of a 100% overwrite with at-the-money one-month calls. In a strong equity rally, the Fund benefits from the additional upside provided by the slightly out-of-the-money calls. Additionally, the Fund’s option strategy overwrites 50% to 100% of the Fund’s assets, unlike the fixed 100% overwrite of the benchmark. During the fiscal Period, the Fund’s overwrite averaged approximately 74.7% of the Fund’s net asset value, providing an option premium sufficiently large to support the Fund’s high distribution rate while still allowing the Fund to participate in strong equity market rally, resulting in strong overall performance 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 (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust Nasdaq BuyWrite Income ETF 22.45 % 5.79 % 5.52 % CBOE Nasdaq-100 BuyWrite Index SM 22.84 % 7.71 % 7.82 % S&P 500 ® 36.35 % 15.98 % 13.38 % Nasdaq-100 Index ® 37.48 % 21.97 % 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. | |
| Material Change Date | Dec. 14, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTQI | |
| Net Assets | $ 453,262,605 | |
| Holdings Count | Holding | 215 | |
| Advisory Fees Paid, Amount | $ 1,938,310 | |
| Investment Company Portfolio Turnover | 58% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 215 Total advisory fee paid $ Portfolio turnover rate 58 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Apple, Inc. 9.2 % Microsoft Corp. 8.2 % NVIDIA Corp. 4.7 % Broadcom, Inc. 4.5 % Meta Platforms, Inc., Class A 4.4 % Amazon.com, Inc. 4.2 % Costco Wholesale Corp. 2.6 % Tesla, Inc. 2.5 % Netflix, Inc. 2.0 % Advanced Micro Devices, Inc. 1.8 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Apple, Inc. 9.2 % Microsoft Corp. 8.2 % NVIDIA Corp. 4.7 % Broadcom, Inc. 4.5 % Meta Platforms, Inc., Class A 4.4 % Amazon.com, Inc. 4.2 % Costco Wholesale Corp. 2.6 % Tesla, Inc. 2.5 % Netflix, Inc. 2.0 % Advanced Micro Devices, Inc. 1.8 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FTQI info ftportfolios.com Effective December 14, 2023, the Fund’s annual management fee decreased from 0.85% to 0.75% of the Fund’s average daily net assets. During the fiscal year ended September 30, 2024, the Fund’s principal investment strategies were revised to reflect that the Fund may invest in real estate investment trusts. | |
| Material Fund Change Expenses [Text Block] | Effective December 14, 2023, the Fund’s annual management fee decreased from 0.85% to 0.75% of the Fund’s average daily net assets. | |
| Material Fund Change Strategies [Text Block] | During the fiscal year ended September 30, 2024, the Fund’s principal investment strategies were revised to reflect that the Fund may invest in real estate investment trusts. | |
| 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/FTQI | |
| C000130399 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust S&P International Dividend Aristocrats ETF | |
| Class Name | First Trust S&P International Dividend Aristocrats ETF | |
| Trading Symbol | FID | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust S&P International Dividend Aristocrats ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/FID 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/FID | |
| 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 International Dividend Aristocrats ETF $ 0.60 % | |
| Expenses Paid, Amount | $ 68 | |
| 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 25.48% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the MSCI World ex USA Index, which returned 24.98% for the same Period. The country with the greatest allocation in the Fund was Canada with a weight of 25.1%. The allocation to Canada contributed the most to Fund performance of any country with an 8.2% contribution to the Fund’s return. With a weight of 1.0%, Sweden was the country with the most negative contribution to the Fund’s return with a -0.3% in contribution to performance. The Fund’s currency exposure had a 4.1% impact on performance. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust S&P International Dividend Aristocrats ETF 25.48 % 4.92 % 3.14 % S&P International Dividend Aristocrats Index (1) 27.71 % 6.38 % N/A Dow Jones EPAC Select Dividend TM 26.56 % 6.30 % 4.18 % MSCI World ex USA Index 24.98 % 8.36 % 5.68 % (1) On August 30, 2018, the Fund’s underlying index changed from the Nasdaq International Multi-Asset Diversified Income TM | |
| 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 August 30, 2018, the Fund’s underlying index changed from the Nasdaq International Multi-Asset Diversified Income TM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FID | |
| Net Assets | $ 82,871,202 | |
| Holdings Count | Holding | 75 | |
| Advisory Fees Paid, Amount | $ 456,412 | |
| Investment Company Portfolio Turnover | 57% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 75 Total advisory fee paid $ Portfolio turnover rate 57 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Solvay S.A. 3.0 % KT&G Corp. 2.5 % Henderson Land Development Co., Ltd. 2.4 % Ping An Insurance Group Co. of China Ltd., Class H 2.4 % Capital Power Corp. 2.0 % Vanguard International Semiconductor Corp. 2.0 % Sino Land Co., Ltd. 2.0 % Keyera Corp. 2.0 % CK Infrastructure Holdings Ltd. 1.9 % Power Assets Holdings Ltd. 1.9 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Solvay S.A. 3.0 % KT&G Corp. 2.5 % Henderson Land Development Co., Ltd. 2.4 % Ping An Insurance Group Co. of China Ltd., Class H 2.4 % Capital Power Corp. 2.0 % Vanguard International Semiconductor Corp. 2.0 % Sino Land Co., Ltd. 2.0 % Keyera Corp. 2.0 % CK Infrastructure Holdings Ltd. 1.9 % Power Assets Holdings Ltd. 1.9 % | |
| C000134868 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Rising Dividend Achievers ETF | |
| Class Name | First Trust Rising Dividend Achievers ETF | |
| Trading Symbol | RDVY | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Rising Dividend Achievers ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/RDVY 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/RDVY | |
| 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 Rising Dividend Achievers ETF $ 0.48 % | |
| Expenses Paid, Amount | $ 56 | |
| Expense Ratio, Percent | 0.48% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 31.31% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the Dow Jones U.S. Select Dividend TM The Financials sector received the greatest allocation of any sector in the Fund with an average weight of 40.4% during the Period. The allocation to this sector contributed 19.4% to the Fund’s overall return, which was the greatest contribution of any sector to the Fund’s return during the Period. With a weight of only 0.8%, the most negative contribution to the Fund’s return came from the Consumer Staples sector with a -0.5% 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 (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust Rising Dividend Achievers ETF 31.31 % 15.33 % 12.97 % Nasdaq US Rising Dividend Achievers TM 32.07 % 15.96 % 13.57 % Dow Jones U.S. Select Dividend TM 30.90 % 10.25 % 10.48 % S&P 500 ® 36.35 % 15.98 % 13.38 % | |
| 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/RDVY | |
| Net Assets | $ 12,091,412,467 | |
| Holdings Count | Holding | 51 | |
| Advisory Fees Paid, Amount | $ 47,745,601 | |
| Investment Company Portfolio Turnover | 57% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 51 Total advisory fee paid $ Portfolio turnover rate 57 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Lam Research Corp. 2.1 % Steel Dynamics, Inc. 2.1 % Applied Materials, Inc. 2.1 % Accenture PLC, Class A 2.1 % CF Industries Holdings, Inc. 2.1 % Chesapeake Energy Corp. 2.1 % Williams-Sonoma, Inc. 2.1 % SLM Corp. 2.0 % Aflac, Inc. 2.0 % Garmin Ltd. 2.0 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings Lam Research Corp. 2.1 % Steel Dynamics, Inc. 2.1 % Applied Materials, Inc. 2.1 % Accenture PLC, Class A 2.1 % CF Industries Holdings, Inc. 2.1 % Chesapeake Energy Corp. 2.1 % Williams-Sonoma, Inc. 2.1 % SLM Corp. 2.0 % Aflac, Inc. 2.0 % Garmin Ltd. 2.0 % | |
| C000137472 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust RBA American Industrial Renaissance® ETF | |
| Class Name | First Trust RBA American Industrial Renaissance® ETF | |
| Trading Symbol | AIRR | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust RBA American Industrial Renaissance ® | |
| 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/AIRR 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/AIRR | |
| 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 RBA American Industrial Renaissance ® $ 0.70 % | |
| Expenses Paid, Amount | $ 86 | |
| 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 44.86% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the S&P 500 ® The Construction & Engineering industry received the greatest allocation in the Fund, with an average weight of 37.9%. The allocation to this industry contributed 27.1% to the Fund’s overall return, which was the greatest contribution of any industry to the Fund’s return during the Period. No industry had a materially negative contribution to the Fund’s return during the Period. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust RBA American Industrial Renaissance ® 44.86 % 22.95 % 15.37 % Richard Bernstein Advisors American Industrial Renaissance ® 45.90 % 23.88 % 16.24 % S&P 500 ® 36.35 % 15.98 % 13.38 % S&P 500 ® 35.89 % 13.76 % 11.73 % Russell 2500 ® 26.17 % 10.43 % 9.50 % | |
| 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. | |
| Material Change Date | Sep. 30, 2024 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/AIRR | |
| Net Assets | $ 1,692,645,368 | |
| Holdings Count | Holding | 60 | |
| Advisory Fees Paid, Amount | $ 6,498,611 | |
| Investment Company Portfolio Turnover | 75% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 60 Total advisory fee paid $ Portfolio turnover rate 75 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Granite Construction, Inc. 3.6 % Mueller Industries, Inc. 3.4 % EMCOR Group, Inc. 3.3 % Hubbell, Inc. 3.3 % Primoris Services Corp. 3.2 % Applied Industrial Technologies, Inc. 3.1 % MDU Resources Group, Inc. 3.1 % BWX Technologies, Inc. 3.1 % Clean Harbors, Inc. 3.0 % MSC Industrial Direct Co., Inc., Class A 3.0 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Granite Construction, Inc. 3.6 % Mueller Industries, Inc. 3.4 % EMCOR Group, Inc. 3.3 % Hubbell, Inc. 3.3 % Primoris Services Corp. 3.2 % Applied Industrial Technologies, Inc. 3.1 % MDU Resources Group, Inc. 3.1 % BWX Technologies, Inc. 3.1 % Clean Harbors, Inc. 3.0 % MSC Industrial Direct Co., Inc., Class A 3.0 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/AIRR info ftportfolios.com During the fiscal year ended September 30, 2024, the Fund’s principal investment strategies were revised to reflect that the universe of eligible industries included in the Fund’s tracking index was expanded. | |
| Material Fund Change Strategies [Text Block] | During the fiscal year ended September 30, 2024, the Fund’s principal investment strategies were revised to reflect that the universe of eligible industries included in the Fund’s tracking index was expanded. | |
| 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/AIRR | |
| C000137473 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dorsey Wright Momentum & Dividend ETF | |
| Class Name | First Trust Dorsey Wright Momentum & Dividend ETF | |
| Trading Symbol | DDIV | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dorsey Wright Momentum & Dividend ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/DDIV 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/DDIV | |
| 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 Dorsey Wright Momentum & Dividend ETF $ 0.60 % | |
| Expenses Paid, Amount | $ 71 | |
| 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 36.01% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Financials sector received the greatest allocation of any sector in the Fund with an average weight of 35.9% during the Period. The allocation to this sector contributed 15.4% to the Fund’s overall return, which was the greatest contribution of any sector to the Fund’s return during the Period. No sector had a materially negative contribution to Fund performance. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust Dorsey Wright Momentum & Dividend ETF 36.01 % 10.43 % 9.36 % Dorsey Wright Momentum Plus Dividend Yield TM (1) 37.05 % 11.24 % N/A Dow Jones U.S. Select Dividend TM 30.90 % 10.25 % 10.48 % S&P 500 ® 36.35 % 15.98 % 13.38 % (1) On September 6, 2018, the Fund’s underlying index changed from the Richard Bernstein Advisors Quality Income Index to the Dorsey Wright Momentum Plus Dividend Yield TM | |
| 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 September 6, 2018, the Fund’s underlying index changed from the Richard Bernstein Advisors Quality Income Index to the Dorsey Wright Momentum Plus Dividend Yield TM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/DDIV | |
| Net Assets | $ 60,661,266 | |
| Holdings Count | Holding | 51 | |
| Advisory Fees Paid, Amount | $ 282,408 | |
| Investment Company Portfolio Turnover | 173% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 51 Total advisory fee paid $ Portfolio turnover rate 173 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Simon Property Group, Inc. 5.3 % OneMain Holdings, Inc. 4.9 % ONEOK, Inc. 4.6 % Lamar Advertising Co., Class A 4.3 % Iron Mountain, Inc. 3.3 % Packaging Corp. of America 3.2 % Jefferies Financial Group, Inc. 3.0 % Popular, Inc. 3.0 % Ares Management Corp., Class A 2.9 % Corebridge Financial, Inc. 2.8 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Simon Property Group, Inc. 5.3 % OneMain Holdings, Inc. 4.9 % ONEOK, Inc. 4.6 % Lamar Advertising Co., Class A 4.3 % Iron Mountain, Inc. 3.3 % Packaging Corp. of America 3.2 % Jefferies Financial Group, Inc. 3.0 % Popular, Inc. 3.0 % Ares Management Corp., Class A 2.9 % Corebridge Financial, Inc. 2.8 % | |
| C000138164 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dorsey Wright Focus 5 ETF | |
| Class Name | First Trust Dorsey Wright Focus 5 ETF | |
| Trading Symbol | FV | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dorsey Wright Focus 5 ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/FV 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/FV | |
| 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 Dorsey Wright Focus 5 ETF $ (1) 0.30 % (1) (1) Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests. | |
| Expenses Paid, Amount | $ 35 | [2] |
| Expense Ratio, Percent | 0.30% | [2] |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 31.86% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Information Technology sector received the greatest allocation of any sector in the Fund with an average weight of 48.3% during the Period. The allocation to this sector contributed 15.3% to the Fund’s overall return, which was the greatest contribution of any sector to the Fund’s return during the Period. No sector had a materially negative contribution to Fund performance. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust Dorsey Wright Focus 5 ETF 31.86 % 15.04 % 11.60 % Dorsey Wright Focus Five TM 32.22 % 15.39 % 11.99 % S&P 500 ® 36.35 % 15.98 % 13.38 % | |
| 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/FV | |
| Net Assets | $ 3,777,592,466 | |
| Holdings Count | Holding | 6 | |
| Advisory Fees Paid, Amount | $ 10,476,080 | |
| Investment Company Portfolio Turnover | 0% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 6 Total advisory fee paid $ Portfolio turnover rate 0 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The table below shows the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings First Trust Nasdaq Semiconductor ETF 20.7 % First Trust Industrials/Producer Durables AlphaDEX ® 20.4 % First Trust NASDAQ-100-Technology Sector Index Fund 20.0 % First Trust Dow Jones Internet Index Fund 19.9 % First Trust Consumer Discretionary AlphaDEX ® 18.9 % Dreyfus Government Cash Management Fund, Institutional Shares 0.1 % | |
| Largest Holdings [Text Block] | Top Ten Holdings First Trust Nasdaq Semiconductor ETF 20.7 % First Trust Industrials/Producer Durables AlphaDEX ® 20.4 % First Trust NASDAQ-100-Technology Sector Index Fund 20.0 % First Trust Dow Jones Internet Index Fund 19.9 % First Trust Consumer Discretionary AlphaDEX ® 18.9 % Dreyfus Government Cash Management Fund, Institutional Shares 0.1 % | |
| C000144324 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dorsey Wright International Focus 5 ETF | |
| Class Name | First Trust Dorsey Wright International Focus 5 ETF | |
| Trading Symbol | IFV | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dorsey Wright International Focus 5 ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/IFV 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/IFV | |
| 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 Dorsey Wright International Focus 5 ETF $ (1) 0.30 % (1) (1) Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests. | |
| Expenses Paid, Amount | $ 33 | [3] |
| Expense Ratio, Percent | 0.30% | [3] |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 20.76% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI ACWI ex USA Index, which returned 25.35% for the same Period. While Japan had the greatest allocation of any country in the Fund with a weight of 20.6%, the country with the greatest contribution to the Fund’s return during the Period was India with a weight of 20.4% and a return contribution of 7.9%. No country had a materially negative contribution to Fund performance. The Fund’s currency exposure had a 3.9% impact on performance. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 30, 2014 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year 10 Year First Trust Dorsey Wright International Focus 5 ETF 20.76 % 4.54 % 3.27 % Dorsey Wright International Focus Five TM 21.21 % 5.11 % 3.74 % MSCI ACWI ex USA Index 25.35 % 7.59 % 5.22 % | |
| 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/IFV | |
| Net Assets | $ 198,832,312 | |
| Holdings Count | Holding | 6 | |
| Advisory Fees Paid, Amount | $ 576,251 | |
| Investment Company Portfolio Turnover | 42% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 6 Total advisory fee paid $ Portfolio turnover rate 42 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The table below shows the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings First Trust United Kingdom AlphaDEX ® 20.4 % First Trust India NIFTY 50 Equal Weight ETF 20.2 % First Trust Japan AlphaDEX ® 19.8 % First Trust Switzerland AlphaDEX ® 19.8 % First Trust Eurozone AlphaDEX ® 19.6 % Dreyfus Government Cash Management Fund, Institutional Shares 0.2 % | |
| Largest Holdings [Text Block] | Top Ten Holdings First Trust United Kingdom AlphaDEX ® 20.4 % First Trust India NIFTY 50 Equal Weight ETF 20.2 % First Trust Japan AlphaDEX ® 19.8 % First Trust Switzerland AlphaDEX ® 19.8 % First Trust Eurozone AlphaDEX ® 19.6 % Dreyfus Government Cash Management Fund, Institutional Shares 0.2 % | |
| C000162607 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dorsey Wright Dynamic Focus 5 ETF | |
| Class Name | First Trust Dorsey Wright Dynamic Focus 5 ETF | |
| Trading Symbol | FVC | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dorsey Wright Dynamic Focus 5 ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/FVC 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/FVC | |
| 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 Dorsey Wright Dynamic Focus 5 ETF $ (1) 0.30 % (1) (1) Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests. | |
| Expenses Paid, Amount | $ 32 | [4] |
| Expense Ratio, Percent | 0.30% | [4] |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 16.48% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Information Technology sector received the greatest allocation of any sector in the Fund with an average weight of 35.6% during the Period. The allocation to this sector contributed 7.1% to the Fund’s overall return, which was the greatest contribution of any sector to Fund return during the Period. No sector had a materially negative contribution to Fund performance. | |
| 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 17, 2016 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year Since First Trust Dorsey Wright Dynamic Focus 5 ETF 16.48 % 7.35 % 7.98 % Dorsey Wright Dynamic Focus Five TM 16.95 % 7.76 % 8.37 % S&P 500 ® 36.35 % 15.98 % 14.95 % | |
| Performance Inception Date | Mar. 17, 2016 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FVC | |
| Net Assets | $ 154,439,138 | |
| Holdings Count | Holding | 6 | |
| Advisory Fees Paid, Amount | $ 503,664 | |
| Investment Company Portfolio Turnover | 200% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 6 Total advisory fee paid $ Portfolio turnover rate 200 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The table below shows the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings First Trust Nasdaq Semiconductor ETF 20.7 % First Trust Industrials/Producer Durables AlphaDEX ® 20.4 % First Trust NASDAQ-100-Technology Sector Index Fund 20.0 % First Trust Dow Jones Internet Index Fund 19.9 % First Trust Consumer Discretionary AlphaDEX ® 18.9 % Dreyfus Government Cash Management Fund, Institutional Shares 0.1 % | |
| Largest Holdings [Text Block] | Top Ten Holdings First Trust Nasdaq Semiconductor ETF 20.7 % First Trust Industrials/Producer Durables AlphaDEX ® 20.4 % First Trust NASDAQ-100-Technology Sector Index Fund 20.0 % First Trust Dow Jones Internet Index Fund 19.9 % First Trust Consumer Discretionary AlphaDEX ® 18.9 % Dreyfus Government Cash Management Fund, Institutional Shares 0.1 % | |
| C000195212 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust SMID Cap Rising Dividend Achievers ETF | |
| Class Name | First Trust SMID Cap Rising Dividend Achievers ETF | |
| Trading Symbol | SDVY | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust SMID Cap Rising Dividend Achievers ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/SDVY 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/SDVY | |
| 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 SMID Cap Rising Dividend Achievers ETF $ 0.59 % | |
| Expenses Paid, Amount | $ 68 | |
| Expense Ratio, Percent | 0.59% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 31.07% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the S&P 1000 ® The Financials sector received the greatest allocation of any sector in the Fund with an average weight of 31.1% during the Period. The allocation to this sector contributed 14.3% to overall Fund return, the greatest contribution of any sector to the Fund’s return during the Period. No sector had a material negative contribution to Fund performance. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (November 1, 2017 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year Since First Trust SMID Cap Rising Dividend Achievers ETF 31.07 % 14.39 % 11.01 % Nasdaq US Small Mid Cap Rising Dividend Achievers TM 32.05 % 15.13 % 11.72 % S&P 1000 ® 26.56 % 11.32 % 9.38 % Russell 3000 ® 35.19 % 15.26 % 13.56 % | |
| Performance Inception Date | Nov. 01, 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. | |
| Material Change Date | Sep. 30, 2024 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/SDVY | |
| Net Assets | $ 6,122,083,500 | |
| Holdings Count | Holding | 97 | |
| Advisory Fees Paid, Amount | $ 21,697,061 | |
| Investment Company Portfolio Turnover | 64% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 97 Total advisory fee paid $ Portfolio turnover rate 64 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings A.O. Smith Corp. 1.1 % Expeditors International of Washington, Inc. 1.1 % Matson, Inc. 1.1 % Steel Dynamics, Inc. 1.1 % Landstar System, Inc. 1.1 % CF Industries Holdings, Inc. 1.1 % Chesapeake Energy Corp. 1.1 % Ralph Lauren Corp. 1.1 % Corebridge Financial, Inc. 1.1 % Westlake Corp. 1.1 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings A.O. Smith Corp. 1.1 % Expeditors International of Washington, Inc. 1.1 % Matson, Inc. 1.1 % Steel Dynamics, Inc. 1.1 % Landstar System, Inc. 1.1 % CF Industries Holdings, Inc. 1.1 % Chesapeake Energy Corp. 1.1 % Ralph Lauren Corp. 1.1 % Corebridge Financial, Inc. 1.1 % Westlake Corp. 1.1 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/SDVY info ftportfolios.com During the fiscal year ended September 30, 2024, the Fund’s principal investment strategies were revised to reflect that, during each quarterly rebalance, securities that no longer meet the size and liquidity requirements of the Fund’s tracking index will be removed from the index. | |
| Material Fund Change Strategies [Text Block] | During the fiscal year ended September 30, 2024, the Fund’s principal investment strategies were revised to reflect that, during each quarterly rebalance, securities that no longer meet the size and liquidity requirements of the Fund’s tracking index will be removed from the index. | |
| 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/SDVY | |
| C000198271 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Indxx Innovative Transaction & Process ETF | |
| Class Name | First Trust Indxx Innovative Transaction & Process ETF | |
| Trading Symbol | LEGR | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Indxx Innovative Transaction & Process ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/LEGR 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/LEGR | |
| 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 Innovative Transaction & Process ETF $ 0.65 % | |
| Expenses Paid, Amount | $ 75 | |
| 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 31.08% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Financials sector received the greatest allocation of any sector in the Fund with an average weight of 40.2% during the Period. The allocation to this sector contributed 14.4% to the Fund’s overall Fund return, the greatest contribution of any sector to the Fund’s overall return during the Period. No sector had a materially negative contribution to Fund performance. The Fund’s currency exposure had a 2.2% impact on performance. | |
| 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 24, 2018 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year Since First Trust Indxx Innovative Transaction & Process ETF 31.08 % 12.44 % 9.29 % Indxx Blockchain Index 32.58 % 13.54 % 10.34 % S&P 500 ® 36.35 % 15.98 % 13.10 % | |
| Performance Inception Date | Jan. 24, 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/LEGR | |
| Net Assets | $ 106,520,050 | |
| Holdings Count | Holding | 106 | |
| Advisory Fees Paid, Amount | $ 662,605 | |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 106 Total advisory fee paid $ Portfolio turnover rate 17 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings JD.com, Inc., ADR 1.9 % Baidu, Inc., ADR 1.6 % Alibaba Group Holding Ltd., ADR 1.6 % Intel Corp. 1.6 % Micron Technology, Inc. 1.5 % China CITIC Bank Corp., Ltd., Class H 1.5 % Industrial & Commercial Bank of China Ltd., Class H 1.5 % PayPal Holdings, Inc. 1.4 % Advanced Micro Devices, Inc. 1.4 % Infineon Technologies AG 1.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings JD.com, Inc., ADR 1.9 % Baidu, Inc., ADR 1.6 % Alibaba Group Holding Ltd., ADR 1.6 % Intel Corp. 1.6 % Micron Technology, Inc. 1.5 % China CITIC Bank Corp., Ltd., Class H 1.5 % Industrial & Commercial Bank of China Ltd., Class H 1.5 % PayPal Holdings, Inc. 1.4 % Advanced Micro Devices, Inc. 1.4 % Infineon Technologies AG 1.4 % | |
| C000198496 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Nasdaq Artificial Intelligence and Robotics ETF | |
| Class Name | First Trust Nasdaq Artificial Intelligence and Robotics ETF | |
| Trading Symbol | ROBT | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Artificial Intelligence and Robotics ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/ROBT 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/ROBT | |
| 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 Artificial Intelligence and Robotics ETF $ 0.65 % | |
| Expenses Paid, Amount | $ 68 | |
| 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 8.75% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® While the Software industry had the greatest allocation of any industry in the Fund with a weight of 38.0%, the industry with the greatest contribution to the Fund’s return during the Period was the Semiconductors & Semiconductor Equipment industry with a weight of 8.9% and a return contribution of 4.0%. With a weight of 7.4%, the Automobile Components industry contributed -4.8% to the Fund’s return, the most negative contribution to the Fund’s return of any industry. The Fund’s currency exposure had a 1.7% impact on performance. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (February 21, 2018 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year Since First Trust Nasdaq Artificial Intelligence and Robotics ETF 8.75 % 7.05 % 6.26 % Nasdaq CTA Artificial Intelligence and Robotics TM 9.36 % 7.70 % 6.92 % S&P 500 ® 36.35 % 15.98 % 14.08 % | |
| Performance Inception Date | Feb. 21, 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/ROBT | |
| Net Assets | $ 453,666,959 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 3,165,770 | |
| Investment Company Portfolio Turnover | 43% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 111 Total advisory fee paid $ Portfolio turnover rate 43 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Mizuho Financial Group, Inc. 2.2 % Daiwa Capital Markets America, Inc. 2.2 % Symbotic, Inc. 2.1 % Palantir Technologies, Inc., Class A 1.9 % Bank of America Corp. 1.9 % Ocado Group PLC 1.9 % Valeo SE 1.8 % PKSHA Technology, Inc. 1.8 % Meta Platforms, Inc., Class A 1.8 % Dynatrace, Inc. 1.7 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Mizuho Financial Group, Inc. 2.2 % Daiwa Capital Markets America, Inc. 2.2 % Symbotic, Inc. 2.1 % Palantir Technologies, Inc., Class A 1.9 % Bank of America Corp. 1.9 % Ocado Group PLC 1.9 % Valeo SE 1.8 % PKSHA Technology, Inc. 1.8 % Meta Platforms, Inc., Class A 1.8 % Dynatrace, Inc. 1.7 % | |
| C000203940 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dorsey Wright Momentum & Low Volatility ETF | |
| Class Name | First Trust Dorsey Wright Momentum & Low Volatility ETF | |
| Trading Symbol | DVOL | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dorsey Wright Momentum & Low Volatility ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/DVOL 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/DVOL | |
| 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 Dorsey Wright Momentum & Low Volatility ETF $ 0.60 % | |
| Expenses Paid, Amount | $ 70 | |
| 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 33.95% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Industrials sector received the greatest allocation of any sector in the Fund with an average weight of 28.8% during the Period. The allocation to this sector contributed 10.3% to overall Fund return, the greatest contribution of any sector to the Fund’s return during the Period. No sector had a material negative contribution to Fund performance. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (September 5, 2018 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year Since First Trust Dorsey Wright Momentum & Low Volatility ETF 33.95 % 8.90 % 9.89 % Dorsey Wright Momentum Plus Low Volatility TM 34.88 % 9.60 % 10.61 % S&P 500 ® 36.35 % 15.98 % 13.96 % | |
| Performance Inception Date | Sep. 05, 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/DVOL | |
| Net Assets | $ 51,388,727 | |
| Holdings Count | Holding | 51 | |
| Advisory Fees Paid, Amount | $ 290,503 | |
| Investment Company Portfolio Turnover | 122% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 51 Total advisory fee paid $ Portfolio turnover rate 122 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Republic Services, Inc. 3.3 % Visa, Inc., Class A 3.1 % Mastercard, Inc., Class A 3.1 % Fiserv, Inc. 3.1 % Marsh & McLennan Cos., Inc. 3.0 % Curtiss-Wright Corp. 3.0 % Walmart, Inc. 2.9 % Linde PLC 2.9 % Motorola Solutions, Inc. 2.8 % Otis Worldwide Corp. 2.8 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Republic Services, Inc. 3.3 % Visa, Inc., Class A 3.1 % Mastercard, Inc., Class A 3.1 % Fiserv, Inc. 3.1 % Marsh & McLennan Cos., Inc. 3.0 % Curtiss-Wright Corp. 3.0 % Walmart, Inc. 2.9 % Linde PLC 2.9 % Motorola Solutions, Inc. 2.8 % Otis Worldwide Corp. 2.8 % | |
| C000203941 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dorsey Wright Momentum & Value ETF | |
| Class Name | First Trust Dorsey Wright Momentum & Value ETF | |
| Trading Symbol | DVLU | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dorsey Wright Momentum & Value ETF (the “Fund”) for the year of October 1, 2023 to September 30, 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/DVLU 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/DVLU | |
| 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 Dorsey Wright Momentum & Value ETF $ 0.60 % | |
| Expenses Paid, Amount | $ 71 | |
| 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 36.49% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the S&P 500 ® While the Financials sector had the greatest allocation of any sector in the Fund with a weight of 28.1%, the sector with the greatest contribution to Fund return during the Period was the Consumer Discretionary sector with a weight of 21.8% and a return contribution of 12.8%. With a weight of 11.3%, the Energy sector contributed -1.1% to Fund return, the most negative contribution to the Fund’s return 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 (September 5, 2018 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year 5 Year Since First Trust Dorsey Wright Momentum & Value ETF 36.49 % 12.45 % 9.12 % Dorsey Wright Momentum Plus Value TM 37.47 % 13.18 % 9.83 % S&P 500 ® 36.35 % 15.98 % 13.96 % | |
| Performance Inception Date | Sep. 05, 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/DVLU | |
| Net Assets | $ 32,362,260 | |
| Holdings Count | Holding | 51 | |
| Advisory Fees Paid, Amount | $ 159,138 | |
| Investment Company Portfolio Turnover | 155% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 51 Total advisory fee paid $ Portfolio turnover rate 155 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings PulteGroup, Inc. 3.7 % Jones Lang LaSalle, Inc. 3.3 % Tenet Healthcare Corp. 3.1 % Capital One Financial Corp. 3.1 % Corebridge Financial, Inc. 3.0 % Reinsurance Group of America, Inc. 3.0 % Travelers (The) Cos., Inc. 3.0 % Popular, Inc. 3.0 % US Foods Holding Corp. 3.0 % NRG Energy, Inc. 2.9 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings PulteGroup, Inc. 3.7 % Jones Lang LaSalle, Inc. 3.3 % Tenet Healthcare Corp. 3.1 % Capital One Financial Corp. 3.1 % Corebridge Financial, Inc. 3.0 % Reinsurance Group of America, Inc. 3.0 % Travelers (The) Cos., Inc. 3.0 % Popular, Inc. 3.0 % US Foods Holding Corp. 3.0 % NRG Energy, Inc. 2.9 % | |
| C000223561 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust International Developed Capital Strength® ETF | |
| Class Name | First Trust International Developed Capital Strength® ETF | |
| Trading Symbol | FICS | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust International Developed 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/FICS 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/FICS | |
| 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 International Developed Capital Strength ® $ 0.70 % | |
| Expenses Paid, Amount | $ 79 | |
| 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 26.15% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the MSCI World ex USA Index, which returned 24.98% for the same Period. The Industrial sector had the greatest allocation and also the greatest contribution to the Fund’s return during the Period, with an allocation of 36.1% and a 12.9% contribution to the Fund’s overall return. The Energy sector contributed the largest drag to the Fund’s return at -0.2%. The Fund’s currency exposure had a 6.5% impact on performance. | |
| 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 15, 2020 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) 1 Year Since First Trust International Developed Capital Strength ® 26.15 % 7.49 % The International Developed Capital Strength TM 27.24 % 8.44 % MSCI World ex USA Index 24.98 % 7.43 % | |
| Performance Inception Date | Dec. 15, 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. | |
| Material Change Date | Sep. 30, 2024 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FICS | |
| Net Assets | $ 156,971,925 | |
| Holdings Count | Holding | 52 | |
| Advisory Fees Paid, Amount | $ 726,757 | |
| Investment Company Portfolio Turnover | 58% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 52 Total advisory fee paid $ Portfolio turnover rate 58 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Aristocrat Leisure Ltd. 2.8 % Unilever PLC 2.4 % DSV A/S 2.4 % Roche Holding AG 2.3 % Obic Co., Ltd. 2.3 % Investor AB, Class B 2.3 % Swiss Re AG 2.3 % Bunzl PLC 2.2 % Industria de Diseno Textil S.A. 2.2 % Givaudan S.A. 2.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Aristocrat Leisure Ltd. 2.8 % Unilever PLC 2.4 % DSV A/S 2.4 % Roche Holding AG 2.3 % Obic Co., Ltd. 2.3 % Investor AB, Class B 2.3 % Swiss Re AG 2.3 % Bunzl PLC 2.2 % Industria de Diseno Textil S.A. 2.2 % Givaudan S.A. 2.2 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FICS info ftportfolios.com During the fiscal year ended September 30, 2024, the Fund’s diversification status under the Investment Company Act of 1940 changed from non-diversified to diversified. The Fund’s principal investment strategies and principal risks were revised accordingly. | |
| Material Fund Change Strategies [Text Block] | During the fiscal year ended September 30, 2024, the Fund’s diversification status under the Investment Company Act of 1940 changed from non-diversified to diversified. The Fund’s principal investment strategies and principal risks were revised accordingly. | |
| Material Fund Change Risks Change [Text Block] | During the fiscal year ended September 30, 2024, the Fund’s diversification status under the Investment Company Act of 1940 changed from non-diversified to diversified. The Fund’s principal investment strategies and principal risks were revised accordingly. | |
| 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/FICS | |
| C000250760 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust S&P 500 Economic Moat ETF | |
| Class Name | First Trust S&P 500 Economic Moat ETF | |
| Trading Symbol | EMOT | |
| 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 Economic Moat ETF (the “Fund”) for the period of June 26, 2024 (commencement of investment operations) to September 30, 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/EMOT 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/EMOT | |
| 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 Economic Moat ETF $ (1) 0.60 % (2) (1) The Fund commenced investment operations on June 26, 2024. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher. (2) Annualized. | |
| Expenses Paid, Amount | $ 16 | [5] |
| Expense Ratio, Percent | 0.60% | [6] |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 6.26% from the Fund’s inception date on June 26, 2024 through September 30, 2024. The Fund outperformed its benchmark, the S&P 500 ® The Information Technology sector received the greatest allocation of any sector in the Fund with an average weight of 35.2% during the Period. However, the greatest contribution to the Fund’s return of 2.4% came from the Consumer Discretionary sector with a 22.0% weight in the Fund. No sector had a negative contribution to the Fund’s return during the Period. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (June 26, 2024 to September 30, 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 Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of September 30, 2024) Since First Trust S&P 500 Economic Moat ETF 6.26 % S&P 500 ® 6.46 % S&P 500 ® 5.56 % | |
| Performance Inception Date | Jun. 26, 2024 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/EMOT | |
| Net Assets | $ 3,182,939 | |
| Holdings Count | Holding | 50 | |
| Advisory Fees Paid, Amount | $ 2,222 | |
| Investment Company Portfolio Turnover | 0% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 50 Total advisory fee paid $ Portfolio turnover rate 0 % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of September 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Fortinet, Inc. 2.4 % Lockheed Martin Corp. 2.4 % Accenture PLC, Class A 2.3 % Starbucks Corp. 2.3 % Walmart, Inc. 2.3 % Oracle Corp. 2.3 % Lowe’s Cos., Inc. 2.3 % McDonald’s Corp. 2.2 % UnitedHealth Group, Inc. 2.2 % Philip Morris International, Inc. 2.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Fortinet, Inc. 2.4 % Lockheed Martin Corp. 2.4 % Accenture PLC, Class A 2.3 % Starbucks Corp. 2.3 % Walmart, Inc. 2.3 % Oracle Corp. 2.3 % Lowe’s Cos., Inc. 2.3 % McDonald’s Corp. 2.2 % UnitedHealth Group, Inc. 2.2 % Philip Morris International, Inc. 2.2 % | |
| [1]Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.[2]Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.[3]Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.[4]Excludes any Acquired Fund Fees and Expenses of underlying investment companies in which the Fund invests.[5]The Fund commenced investment operations on June 26, 2024. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.[6]Annualized. | ||
| Shareholder Report, Line Graph (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 46 Months Ended | 60 Months Ended | 73 Months Ended | 79 Months Ended | 80 Months Ended | 83 Months Ended | 102 Months Ended | 120 Months Ended | ||||||||||||||||||||||||||||
| Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Jun. 26, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 15, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 05, 2018 | Mar. 31, 2018 | Feb. 21, 2018 | Jan. 24, 2018 | Nov. 01, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Mar. 17, 2016 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | ||
| C000117913 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust NASDAQ Technology Dividend Index Fund | |||||||||||||||||||||||||||||||||||||
| Account Value | $ 37,401 | $ 37,401 | $ 37,401 | $ 37,401 | $ 37,401 | $ 37,401 | $ 37,401 | $ 37,401 | $ 37,401 | $ 37,401 | $ 32,230 | $ 25,679 | $ 24,566 | $ 19,570 | $ 26,095 | $ 24,750 | $ 23,441 | $ 18,852 | $ 15,072 | $ 16,846 | $ 15,888 | $ 15,714 | $ 14,447 | $ 12,946 | $ 12,489 | $ 11,447 | $ 10,375 | $ 9,208 | $ 10,063 | $ 10,000 | ||||||||
| Average Annual Return, Percent | 45.65% | 17.30% | 14.10% | |||||||||||||||||||||||||||||||||||
| C000117914 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Multi-Asset Diversified Income Index Fund | |||||||||||||||||||||||||||||||||||||
| Account Value | 14,370 | $ 14,370 | 14,370 | $ 14,370 | 14,370 | 14,370 | 14,370 | 14,370 | 14,370 | $ 14,370 | 13,292 | 11,852 | 11,531 | 10,968 | 12,385 | 11,702 | 11,296 | 9,178 | 7,717 | 11,750 | 11,358 | 11,111 | 10,418 | 10,806 | 10,659 | 10,046 | 9,557 | 9,144 | 10,105 | 10,000 | ||||||||
| Average Annual Return, Percent | 21.26% | 4.11% | 3.69% | |||||||||||||||||||||||||||||||||||
| C000125197 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust BuyWrite Income ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 20,019 | $ 20,019 | 20,019 | $ 20,019 | 20,019 | 20,019 | 20,019 | 20,019 | 20,019 | $ 20,019 | 18,662 | 16,222 | 15,357 | 13,427 | 15,960 | 14,531 | 13,987 | 12,386 | 10,966 | 13,860 | 13,110 | 13,761 | 12,832 | 12,728 | 11,793 | 11,172 | 10,567 | 9,904 | 10,432 | 10,000 | ||||||||
| Average Annual Return, Percent | 23.40% | 7.63% | 7.19% | |||||||||||||||||||||||||||||||||||
| C000125204 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Nasdaq BuyWrite Income ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 17,122 | $ 17,122 | 17,122 | $ 17,122 | 17,122 | 17,122 | 17,122 | 17,122 | 17,122 | $ 17,122 | 16,154 | 13,982 | 13,580 | 11,898 | 14,208 | 13,074 | 12,660 | 11,504 | 11,351 | 12,921 | 12,342 | 12,883 | 12,138 | 12,161 | 11,328 | 10,803 | 10,290 | 9,774 | 10,297 | 10,000 | ||||||||
| Average Annual Return, Percent | 22.45% | 5.79% | 5.52% | |||||||||||||||||||||||||||||||||||
| C000130399 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust S&P International Dividend Aristocrats ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 13,621 | $ 13,621 | 13,621 | $ 13,621 | 13,621 | 13,621 | 13,621 | 13,621 | 13,621 | $ 13,621 | 11,933 | 10,856 | 11,300 | 9,728 | 12,161 | 11,918 | 11,623 | 9,254 | 8,245 | 10,712 | 10,249 | 10,365 | 10,682 | 10,611 | 9,689 | 9,394 | 8,995 | 8,271 | 9,538 | 10,000 | ||||||||
| Average Annual Return, Percent | 25.48% | 4.92% | 3.14% | |||||||||||||||||||||||||||||||||||
| C000134868 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Rising Dividend Achievers ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 33,844 | $ 33,844 | 33,844 | $ 33,844 | 33,844 | 33,844 | 33,844 | 33,844 | 33,844 | $ 33,844 | 31,871 | 25,777 | 24,906 | 21,265 | 26,515 | 25,548 | 24,332 | 17,354 | 13,494 | 16,590 | 15,429 | 16,151 | 15,124 | 14,072 | 13,285 | 11,034 | 10,263 | 9,853 | 10,672 | 10,000 | ||||||||
| Average Annual Return, Percent | 31.31% | 15.33% | 12.97% | |||||||||||||||||||||||||||||||||||
| C000137472 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust RBA American Industrial Renaissance® ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 41,766 | $ 41,766 | 41,766 | $ 41,766 | 41,766 | 41,766 | 41,766 | 41,766 | 41,766 | $ 41,766 | 37,659 | 28,833 | 26,806 | 21,293 | 23,557 | 22,752 | 22,550 | 14,296 | 11,155 | 14,863 | 13,547 | 15,472 | 14,377 | 14,386 | 13,172 | 11,291 | 9,678 | 8,410 | 10,428 | 10,000 | ||||||||
| Average Annual Return, Percent | 44.86% | 22.95% | 15.37% | |||||||||||||||||||||||||||||||||||
| C000137473 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dorsey Wright Momentum & Dividend ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 24,472 | $ 24,472 | 24,472 | $ 24,472 | 24,472 | 24,472 | 24,472 | 24,472 | 24,472 | $ 24,472 | 22,395 | 17,991 | 17,731 | 16,739 | 20,569 | 18,824 | 17,446 | 12,443 | 10,420 | 14,899 | 13,641 | 13,941 | 13,387 | 13,266 | 12,423 | 11,645 | 11,302 | 10,349 | 10,998 | 10,000 | ||||||||
| Average Annual Return, Percent | 36.01% | 10.43% | 9.36% | |||||||||||||||||||||||||||||||||||
| C000138164 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dorsey Wright Focus 5 ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 29,964 | $ 29,964 | 29,964 | $ 29,964 | 29,964 | 29,964 | 29,964 | 29,964 | 29,964 | $ 29,964 | 29,435 | 22,724 | 23,160 | 20,919 | 24,110 | 23,068 | 22,479 | 17,175 | 13,055 | 14,871 | 15,044 | 15,477 | 14,326 | 13,017 | 11,935 | 11,304 | 10,627 | 10,755 | 11,770 | 10,000 | ||||||||
| Average Annual Return, Percent | 31.86% | 15.04% | 11.60% | |||||||||||||||||||||||||||||||||||
| C000144324 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dorsey Wright International Focus 5 ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 13,798 | $ 13,798 | 13,798 | $ 13,798 | 13,798 | 13,798 | 13,798 | 13,798 | 13,798 | $ 13,798 | 13,061 | 11,426 | 10,807 | 10,020 | 12,779 | 13,706 | 13,764 | 11,242 | 8,155 | 11,049 | 10,946 | 11,561 | 12,490 | 11,908 | 10,631 | 9,704 | 9,388 | 9,299 | 10,467 | 10,000 | ||||||||
| Average Annual Return, Percent | 20.76% | 4.54% | 3.27% | |||||||||||||||||||||||||||||||||||
| C000162607 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dorsey Wright Dynamic Focus 5 ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 19,263 | $ 19,263 | 19,263 | $ 19,263 | 19,263 | 19,263 | 19,263 | 19,263 | $ 19,263 | $ 19,263 | 18,483 | 16,538 | 17,285 | 17,316 | 18,890 | 18,073 | 17,615 | 13,456 | 11,561 | 13,517 | 13,601 | 14,606 | 13,519 | 12,283 | 11,265 | 10,668 | 10,090 | $ 10,000 | ||||||||||
| Average Annual Return, Percent | 16.48% | 7.35% | 7.98% | |||||||||||||||||||||||||||||||||||
| C000195212 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust SMID Cap Rising Dividend Achievers ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 20,589 | $ 20,589 | 20,589 | $ 20,589 | 20,589 | 20,589 | 20,589 | $ 20,589 | $ 20,589 | 20,589 | 19,548 | 15,708 | 14,675 | 12,541 | 14,924 | 15,069 | 14,978 | 9,612 | 7,442 | 10,513 | 10,192 | 10,792 | 10,428 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 31.07% | 14.39% | 11.01% | |||||||||||||||||||||||||||||||||||
| C000198271 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Indxx Innovative Transaction & Process ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 18,110 | $ 18,110 | 18,110 | $ 18,110 | 18,110 | 18,110 | $ 18,110 | $ 18,110 | 18,110 | 18,110 | 16,182 | 13,816 | 13,685 | 11,042 | 14,302 | 14,832 | 13,939 | 10,895 | 8,634 | 10,076 | 9,882 | 10,187 | 9,651 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 31.08% | 12.44% | 9.29% | |||||||||||||||||||||||||||||||||||
| C000198496 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Nasdaq Artificial Intelligence and Robotics ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 14,931 | $ 14,931 | 14,931 | $ 14,931 | 14,931 | $ 14,931 | $ 14,931 | 14,931 | 14,931 | 14,931 | 15,337 | 13,730 | 14,456 | 11,395 | 15,959 | 18,018 | 17,527 | 13,125 | 9,155 | 10,619 | 10,654 | 10,815 | 9,838 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 8.75% | 7.05% | 6.26% | |||||||||||||||||||||||||||||||||||
| C000203940 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dorsey Wright Momentum & Low Volatility ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 17,728 | $ 17,728 | 17,728 | $ 17,728 | $ 17,728 | $ 17,728 | 17,728 | 17,728 | 17,728 | 17,728 | 16,297 | 13,234 | 13,489 | 12,528 | 14,861 | 14,239 | 12,738 | 11,578 | 9,218 | 11,575 | 10,353 | 9,985 | $ 10,000 | |||||||||||||||
| Average Annual Return, Percent | 33.95% | 8.90% | 9.89% | |||||||||||||||||||||||||||||||||||
| C000203941 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Dorsey Wright Momentum & Value ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 16,979 | $ 16,979 | 16,979 | $ 16,979 | $ 16,979 | 16,979 | 16,979 | 16,979 | 16,979 | 16,979 | 16,522 | 12,440 | 12,035 | 10,909 | 13,550 | 12,355 | 11,640 | 7,820 | 6,222 | 9,443 | 8,945 | 9,740 | 10,000 | |||||||||||||||
| Average Annual Return, Percent | 36.49% | 12.45% | 9.12% | |||||||||||||||||||||||||||||||||||
| C000223561 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust International Developed Capital Strength® ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | 13,153 | $ 13,153 | $ 13,153 | $ 13,153 | $ 13,153 | 13,153 | 13,153 | 13,153 | 13,153 | 13,153 | 12,112 | 10,426 | 10,803 | 8,855 | 11,088 | 11,425 | 10,442 | $ 10,000 | ||||||||||||||||||||
| Average Annual Return, Percent | 26.15% | 7.49% | ||||||||||||||||||||||||||||||||||||
| C000250760 [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust S&P 500 Economic Moat ETF | |||||||||||||||||||||||||||||||||||||
| Account Value | $ 10,626 | $ 10,626 | $ 10,626 | 10,626 | 10,626 | 10,626 | 10,626 | 10,626 | 10,626 | 10,626 | $ 10,000 | |||||||||||||||||||||||||||
| Average Annual Return, Percent | 6.26% | |||||||||||||||||||||||||||||||||||||
| Standard & Poor's 500 Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index | |||||||||||||||||||||||||||||||||||||
| Account Value | $ 35,098 | $ 35,098 | 35,098 | $ 35,098 | $ 35,098 | $ 35,098 | $ 35,098 | 35,098 | $ 35,098 | $ 35,098 | 10,000 | 31,786 | 25,742 | 24,471 | 21,165 | 26,521 | 25,039 | 22,933 | 19,260 | 14,668 | 16,726 | 15,768 | 16,043 | 10,000 | 14,402 | 10,000 | 10,000 | 13,607 | 12,633 | 11,472 | 10,782 | 10,000 | 9,938 | 10,593 | 10,000 | |||
| Average Annual Return, Percent | 5.56% | 36.35% | 15.98% | 13.96% | 14.08% | 13.10% | 14.95% | 13.38% | ||||||||||||||||||||||||||||||
| MSCI World ex USA Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI World ex USA Index | |||||||||||||||||||||||||||||||||||||
| Account Value | $ 17,373 | $ 17,373 | $ 17,373 | $ 17,373 | $ 17,373 | $ 17,373 | $ 17,373 | 17,373 | $ 17,373 | $ 17,373 | 16,203 | 13,900 | 14,068 | 11,209 | 14,465 | 14,733 | 14,037 | 10,000 | 11,646 | 9,624 | 11,628 | 11,307 | 11,738 | 11,656 | 11,434 | 10,248 | 9,630 | 9,156 | 8,986 | 10,000 | 10,000 | |||||||
| Average Annual Return, Percent | 24.98% | 7.43% | 8.36% | 5.68% | ||||||||||||||||||||||||||||||||||
| MSCI ACWI ex USA Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI ex USA Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 16,630 | $ 16,630 | $ 16,630 | $ 16,630 | 16,630 | 16,630 | 16,630 | 16,630 | 16,630 | $ 16,630 | 15,220 | 13,266 | 13,458 | 11,019 | 14,176 | 14,724 | 14,390 | 11,883 | 9,631 | 11,537 | 11,408 | 11,680 | 11,892 | 11,478 | 10,221 | 9,597 | 9,035 | 8,784 | 9,949 | 10,000 | ||||||||
| Average Annual Return, Percent | 25.35% | 7.59% | 5.22% | |||||||||||||||||||||||||||||||||||
| Russell 3000 Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 24,077 | $ 24,077 | 24,077 | $ 24,077 | 24,077 | 24,077 | 24,077 | $ 24,077 | 24,077 | $ 24,077 | 21,959 | 17,810 | 16,984 | 14,784 | 18,578 | 17,948 | 16,599 | 13,610 | 10,213 | 11,835 | 11,238 | 11,499 | 10,333 | 10,000 | ||||||||||||||
| Average Annual Return, Percent | 35.19% | 15.26% | 13.56% | |||||||||||||||||||||||||||||||||||
| Nasdaq Technology DividendTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq Technology DividendTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 39,849 | $ 39,849 | 39,849 | $ 39,849 | 39,849 | 39,849 | 39,849 | $ 39,849 | 39,849 | $ 39,849 | 34,222 | 27,171 | 25,915 | 20,569 | 27,376 | 25,888 | 24,446 | 19,593 | 15,603 | 17,389 | 16,341 | 16,112 | 14,763 | 13,186 | 12,680 | 11,591 | 10,471 | 9,262 | 10,091 | 10,000 | ||||||||
| Average Annual Return, Percent | 46.66% | 18.04% | 14.83% | |||||||||||||||||||||||||||||||||||
| 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 | 75,490 | $ 75,490 | 75,490 | $ 75,490 | 75,490 | 75,490 | 75,490 | 75,490 | 75,490 | $ 75,490 | 65,282 | 49,445 | 44,712 | 35,044 | 46,842 | 43,804 | 38,747 | 33,983 | 23,256 | 23,080 | 21,060 | 21,255 | 18,242 | 16,165 | 14,287 | 12,541 | 11,438 | 10,211 | 10,585 | 10,000 | ||||||||
| Average Annual Return, Percent | 52.68% | 26.74% | 22.40% | |||||||||||||||||||||||||||||||||||
| Nasdaq US Multi Asset Diversified IncomeTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq US Multi-Asset Diversified IncomeTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 15,268 | $ 15,268 | 15,268 | $ 15,268 | 15,268 | 15,268 | 15,268 | 15,268 | 15,268 | $ 15,268 | 14,083 | 12,523 | 12,154 | 11,522 | 12,985 | 12,231 | 11,770 | 9,530 | 7,972 | 12,153 | 11,718 | 11,427 | 10,681 | 11,048 | 10,868 | 10,195 | 9,669 | 9,218 | 10,161 | 10,000 | ||||||||
| Average Annual Return, Percent | 21.92% | 4.67% | 4.32% | |||||||||||||||||||||||||||||||||||
| 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 | |||||||||||||||||||||||||||||||||||||
| Account Value | 27,098 | $ 27,098 | 27,098 | $ 27,098 | 27,098 | 27,098 | 27,098 | 27,098 | 27,098 | $ 27,098 | 24,197 | 20,700 | 22,053 | 19,745 | 23,112 | 20,376 | 19,873 | 13,941 | 12,291 | 16,634 | 15,696 | 15,645 | 14,642 | 14,148 | 13,526 | 12,497 | 11,697 | 10,224 | 10,744 | 10,000 | ||||||||
| Average Annual Return, Percent | 30.90% | 10.25% | 10.48% | |||||||||||||||||||||||||||||||||||
| CBOE S And P 500 BuyWrite Monthly Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | CBOE S&P 500® BuyWrite Monthly Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 18,344 | $ 18,344 | 18,344 | $ 18,344 | 18,344 | 18,344 | 18,344 | 18,344 | 18,344 | $ 18,344 | 17,127 | 15,505 | 15,306 | 13,527 | 16,433 | 15,235 | 14,305 | 12,580 | 10,821 | 13,334 | 12,840 | 13,484 | 12,431 | 12,285 | 11,623 | 10,887 | 10,359 | 10,036 | 10,086 | 10,000 | ||||||||
| Average Annual Return, Percent | 18.31% | 6.59% | 6.25% | |||||||||||||||||||||||||||||||||||
| CBOE Nasdaq 100 BuyWrite IndexSM [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | CBOE Nasdaq-100 BuyWrite IndexSM | |||||||||||||||||||||||||||||||||||||
| Account Value | 21,224 | $ 21,224 | 21,224 | $ 21,224 | 21,224 | 21,224 | 21,224 | 21,224 | 21,224 | $ 21,224 | 19,659 | 17,277 | 16,810 | 14,343 | 17,905 | 17,533 | 16,912 | 15,293 | 13,034 | 14,641 | 14,016 | 14,736 | 13,223 | 12,737 | 11,752 | 10,870 | 10,389 | 9,840 | 9,856 | 10,000 | ||||||||
| Average Annual Return, Percent | 22.84% | 7.71% | 7.82% | |||||||||||||||||||||||||||||||||||
| Nasdaq 100 Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq-100 Index® | |||||||||||||||||||||||||||||||||||||
| Account Value | 54,734 | $ 54,734 | 54,734 | $ 54,734 | 54,734 | 54,734 | 54,734 | 54,734 | 54,734 | $ 54,734 | 49,603 | 39,813 | 35,519 | 29,424 | 39,621 | 39,087 | 34,713 | 30,165 | 20,555 | 20,279 | 19,206 | 19,739 | 16,942 | 15,312 | 13,843 | 12,341 | 11,276 | 10,446 | 10,765 | 10,000 | ||||||||
| Average Annual Return, Percent | 37.48% | 21.97% | 18.53% | |||||||||||||||||||||||||||||||||||
| S And P International Dividend Aristocrats Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P International Dividend Aristocrats Index | |||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [1] | 27.71% | 6.38% | |||||||||||||||||||||||||||||||||||
| Dow Jones EPAC Select DividendTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones EPAC Select DividendTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 15,066 | $ 15,066 | 15,066 | $ 15,066 | 15,066 | 15,066 | 15,066 | 15,066 | 15,066 | $ 15,066 | 13,456 | 11,903 | 12,276 | 9,896 | 13,330 | 12,474 | 12,461 | 9,687 | 8,512 | 11,101 | 10,776 | 11,136 | 10,885 | 10,902 | 9,902 | 9,258 | 8,764 | 8,226 | 9,606 | 10,000 | ||||||||
| Average Annual Return, Percent | 26.56% | 6.30% | 4.18% | |||||||||||||||||||||||||||||||||||
| Nasdaq US Rising Dividend AchieversTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq US Rising Dividend AchieversTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 35,700 | $ 35,700 | 35,700 | $ 35,700 | 35,700 | 35,700 | 35,700 | 35,700 | 35,700 | $ 35,700 | 33,527 | 27,030 | 26,046 | 22,178 | 27,609 | 26,531 | 25,198 | 17,910 | 13,875 | 17,031 | 15,794 | 16,493 | 15,407 | 14,294 | 13,460 | 11,144 | 10,339 | 9,895 | 10,691 | 10,000 | ||||||||
| Average Annual Return, Percent | 32.07% | 15.96% | 13.57% | |||||||||||||||||||||||||||||||||||
| Dow Jones U S Select DividendTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones U.S. Select DividendTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 27,098 | $ 27,098 | 27,098 | $ 27,098 | 27,098 | 27,098 | 27,098 | 27,098 | 27,098 | $ 27,098 | 24,198 | 20,702 | 22,054 | 19,744 | 23,112 | 20,375 | 19,874 | 13,941 | 12,291 | 16,634 | 15,696 | 15,644 | 14,641 | 14,147 | 13,526 | 12,497 | 11,697 | 10,224 | 10,744 | 10,000 | ||||||||
| Average Annual Return, Percent | 30.90% | 10.25% | 10.48% | |||||||||||||||||||||||||||||||||||
| S And P 500 Industrials Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Industrials Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 30,318 | $ 30,318 | 30,318 | $ 30,318 | 30,318 | 30,318 | 30,318 | 30,318 | 30,318 | $ 30,318 | 27,989 | 22,310 | 22,091 | 17,908 | 22,054 | 20,790 | 20,780 | 16,123 | 12,249 | 15,911 | 15,213 | 15,694 | 14,737 | 14,116 | 12,932 | 11,536 | 10,925 | 9,635 | 10,585 | 10,000 | ||||||||
| Average Annual Return, Percent | 35.89% | 13.76% | 11.73% | |||||||||||||||||||||||||||||||||||
| Russell 2500 Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2500® Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 24,773 | $ 24,773 | 24,773 | $ 24,773 | 24,773 | 24,773 | 24,773 | 24,773 | 24,773 | $ 24,773 | 23,797 | 19,635 | 19,597 | 17,644 | 21,869 | 22,365 | 21,793 | 15,421 | 11,508 | 15,086 | 14,843 | 15,722 | 14,206 | 13,531 | 12,648 | 11,487 | 10,408 | 10,038 | 11,229 | 10,000 | ||||||||
| Average Annual Return, Percent | 26.17% | 10.43% | 9.50% | |||||||||||||||||||||||||||||||||||
| Richard Bernstein Advisors American Industrial Renaissance Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Richard Bernstein Advisors American Industrial Renaissance® Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 45,049 | $ 45,049 | 45,049 | $ 45,049 | 45,049 | 45,049 | 45,049 | 45,049 | 45,049 | $ 45,049 | 40,474 | 30,876 | 28,597 | 22,629 | 24,949 | 24,006 | 23,701 | 14,972 | 11,630 | 15,444 | 14,021 | 15,988 | 14,800 | 14,759 | 13,461 | 11,496 | 9,817 | 8,497 | 10,471 | 10,000 | ||||||||
| Average Annual Return, Percent | 45.90% | 23.88% | 16.24% | |||||||||||||||||||||||||||||||||||
| Dorsey Wright Momentum Plus Dividend YieldTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dorsey Wright Momentum Plus Dividend YieldTM Index | |||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [2] | 37.05% | 11.24% | |||||||||||||||||||||||||||||||||||
| Dorsey Wright Focus FiveTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dorsey Wright Focus FiveTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 31,031 | $ 31,031 | 31,031 | $ 31,031 | 31,031 | 31,031 | 31,031 | 31,031 | 31,031 | $ 31,031 | 30,440 | 23,468 | 23,869 | 21,510 | 24,753 | 23,624 | 22,987 | 17,534 | 13,301 | 15,172 | 15,323 | 15,737 | 14,544 | 13,195 | 12,081 | 11,423 | 10,720 | 10,789 | 11,788 | 10,000 | ||||||||
| Average Annual Return, Percent | 32.22% | 15.39% | 11.99% | |||||||||||||||||||||||||||||||||||
| Dorsey Wright International Focus FiveTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dorsey Wright International Focus FiveTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 14,436 | $ 14,436 | 14,436 | $ 14,436 | 14,436 | 14,436 | 14,436 | 14,436 | 14,436 | $ 14,436 | 13,640 | 11,911 | 11,244 | 10,397 | 13,241 | 14,180 | 14,216 | 11,591 | 8,395 | 11,250 | 11,123 | 11,734 | 12,661 | 12,048 | 10,746 | 9,789 | 9,246 | $ 9,177 | $ 10,438 | $ 10,000 | ||||||||
| Average Annual Return, Percent | 21.21% | 5.11% | 3.74% | |||||||||||||||||||||||||||||||||||
| Dorsey Wright Dynamic Focus FiveTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dorsey Wright Dynamic Focus FiveTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 19,873 | $ 19,873 | 19,873 | $ 19,873 | 19,873 | 19,873 | 19,873 | 19,873 | $ 19,873 | $ 19,873 | 19,030 | 16,993 | 17,713 | 17,682 | 19,246 | 18,369 | 17,874 | 13,633 | 11,682 | 13,677 | 13,737 | 14,731 | 13,615 | $ 12,353 | $ 11,310 | $ 10,694 | $ 10,094 | $ 10,000 | ||||||||||
| Average Annual Return, Percent | 16.95% | 7.76% | 8.37% | |||||||||||||||||||||||||||||||||||
| Nasdaq US Small Mid Cap Rising Dividend AchieversTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq US Small Mid Cap Rising Dividend AchieversTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 21,514 | $ 21,514 | 21,514 | $ 21,514 | 21,514 | 21,514 | 21,514 | $ 21,514 | $ 21,514 | 21,514 | 20,356 | 16,292 | 15,166 | 12,913 | 15,340 | 15,439 | 15,301 | 9,777 | 7,546 | 10,636 | 10,283 | 10,862 | 10,458 | 10,000 | ||||||||||||||
| Average Annual Return, Percent | 32.05% | 15.13% | 11.72% | |||||||||||||||||||||||||||||||||||
| S And P 1000 Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 1000® Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 18,581 | $ 18,581 | 18,581 | $ 18,581 | 18,581 | 18,581 | 18,581 | $ 18,581 | 18,581 | 18,581 | 17,810 | 14,682 | 14,712 | 12,894 | 15,691 | 15,415 | 15,153 | 10,439 | 8,106 | 10,871 | 10,598 | 11,402 | 10,363 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 26.56% | 11.32% | 9.38% | |||||||||||||||||||||||||||||||||||
| Indxx Blockchain Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Indxx Blockchain Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 19,297 | $ 19,297 | 19,297 | $ 19,297 | 19,297 | 19,297 | $ 19,297 | $ 19,297 | 19,297 | 19,297 | 17,130 | 14,554 | 14,328 | 11,540 | 14,916 | 15,392 | 14,363 | 11,154 | 8,830 | 10,227 | 9,982 | 10,257 | 9,654 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 32.58% | 13.54% | 10.34% | |||||||||||||||||||||||||||||||||||
| Nasdaq CTA Artificial Intelligence and RoboticsTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq CTA Artificial Intelligence and RoboticsTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 15,559 | $ 15,559 | 15,559 | $ 15,559 | 15,559 | $ 15,559 | $ 15,559 | 15,559 | 15,559 | 15,559 | 15,936 | 14,228 | 14,900 | 11,757 | 16,497 | 18,525 | 17,937 | 13,394 | 9,327 | 10,741 | 10,732 | 10,859 | $ 9,794 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 9.36% | 7.70% | 6.92% | |||||||||||||||||||||||||||||||||||
| Dorsey Wright Momentum Plus Low VolatilityTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dorsey Wright Momentum Plus Low VolatilityTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 18,437 | $ 18,437 | 18,437 | $ 18,437 | $ 18,437 | $ 18,437 | 18,437 | 18,437 | 18,437 | 18,437 | 16,892 | 13,669 | 13,886 | 12,855 | 15,211 | 14,524 | 12,954 | 11,740 | 9,310 | 11,659 | 10,391 | 9,989 | 10,000 | |||||||||||||||
| Average Annual Return, Percent | 34.88% | 9.60% | 10.61% | |||||||||||||||||||||||||||||||||||
| Dorsey Wright Momentum Plus ValueTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dorsey Wright Momentum Plus ValueTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 17,663 | $ 17,663 | 17,663 | $ 17,663 | $ 17,663 | 17,663 | 17,663 | 17,663 | 17,663 | 17,663 | 17,128 | 12,849 | 12,384 | 11,185 | 13,855 | 12,586 | 11,819 | $ 7,906 | $ 6,276 | $ 9,512 | $ 8,974 | $ 9,746 | $ 10,000 | |||||||||||||||
| Average Annual Return, Percent | 37.47% | 13.18% | 9.83% | |||||||||||||||||||||||||||||||||||
| The International Developed Capital StrengthTM Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The International Developed Capital StrengthTM Index | |||||||||||||||||||||||||||||||||||||
| Account Value | 13,596 | $ 13,596 | $ 13,596 | $ 13,596 | $ 13,596 | 13,596 | 13,596 | 13,596 | 13,596 | 13,596 | $ 12,458 | $ 10,685 | $ 10,982 | $ 9,057 | $ 11,335 | $ 11,600 | $ 10,523 | $ 10,000 | ||||||||||||||||||||
| Average Annual Return, Percent | 27.24% | 8.44% | ||||||||||||||||||||||||||||||||||||
| S And P 500 Economic Moat Index [Member] | ||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Economic Moat Index | |||||||||||||||||||||||||||||||||||||
| Account Value | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,646 | $ 10,000 | |||||||||||||||||||||||||||
| Average Annual Return, Percent | 6.46% | |||||||||||||||||||||||||||||||||||||
| [1]On August 30, 2018, the Fund’s underlying index changed from the Nasdaq International Multi-Asset Diversified Income TM TM | ||||||||||||||||||||||||||||||||||||||
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| C000117913 [Member] | International Business Machines Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.50% |
| C000117913 [Member] | Oracle Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000117913 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000117913 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000117913 [Member] | Texas Instruments Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000117913 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000117913 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000117913 [Member] | Analog Devices Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000117913 [Member] | AT And T Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000117913 [Member] | Verizon Communications Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000117913 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000117913 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000117913 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 82.80% |
| C000117913 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000117913 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000117914 [Member] | First Trust Tactical High Yield ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20% |
| C000117914 [Member] | Icahn Enterprises L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000117914 [Member] | PennyMac Mortgage Investment Trust [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000117914 [Member] | Delek Logistics Partners L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000117914 [Member] | Alliance Resource Partners L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000117914 [Member] | Black Stone Minerals L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000117914 [Member] | Kimbell Royalty Partners L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000117914 [Member] | CrossAmerica Partners L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000117914 [Member] | Dorchester Minerals L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000117914 [Member] | Rithm Capital Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000117914 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000117914 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000117914 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000117914 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000117914 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000117914 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000117914 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000117914 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17% |
| C000117914 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.90% |
| C000117914 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| C000125197 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000125197 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000125197 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000125197 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000125197 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000125197 [Member] | Meta Platforms Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000125197 [Member] | Alphabet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000125197 [Member] | Alphabet Inc Class C [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000125197 [Member] | Berkshire Hathaway Inc Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000125197 [Member] | Blackstone Mortgage Trust Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000125197 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000125197 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000125197 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.90% |
| C000125197 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000125197 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000125197 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.40% |
| C000125197 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000125197 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000125197 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.60% |
| C000125197 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000125204 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000125204 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000125204 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000125204 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000125204 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000125204 [Member] | Meta Platforms Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000125204 [Member] | Costco Wholesale Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000125204 [Member] | Tesla Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000125204 [Member] | Netflix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000125204 [Member] | Advanced Micro Devices Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000125204 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000125204 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000125204 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 45.70% |
| C000125204 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000125204 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000125204 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000125204 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.80% |
| C000125204 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000125204 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000125204 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000130399 [Member] | Solvay S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000130399 [Member] | KT And G Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000130399 [Member] | Henderson Land Development Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000130399 [Member] | Ping An Insurance Group Co of China Ltd Class H [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000130399 [Member] | Capital Power Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000130399 [Member] | Vanguard International Semiconductor Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000130399 [Member] | Sino Land Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000130399 [Member] | Keyera Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000130399 [Member] | CK Infrastructure Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000130399 [Member] | Power Assets Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000130399 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000130399 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000130399 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.80% |
| C000130399 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000130399 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000130399 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000130399 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000130399 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000130399 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.20% |
| C000130399 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000134868 [Member] | Lam Research Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000134868 [Member] | Steel Dynamics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000134868 [Member] | Applied Materials Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000134868 [Member] | Accenture PLC Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000134868 [Member] | CF Industries Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000134868 [Member] | Chesapeake Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000134868 [Member] | Williams Sonoma Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000134868 [Member] | Garmin Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000134868 [Member] | SLM Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000134868 [Member] | Aflac Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000134868 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000134868 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000134868 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000134868 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000134868 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000134868 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000134868 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 39.60% |
| C000134868 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.10% |
| C000134868 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000137472 [Member] | Granite Construction Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000137472 [Member] | Mueller Industries Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000137472 [Member] | EMCOR Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000137472 [Member] | Hubbell Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000137472 [Member] | Primoris Services Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000137472 [Member] | Applied Industrial Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000137472 [Member] | MDU Resources Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000137472 [Member] | BWX Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000137472 [Member] | Clean Harbors Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000137472 [Member] | MSC Industrial Direct Co Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000137472 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 90.40% |
| C000137472 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000137472 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000137473 [Member] | ONEOK Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000137473 [Member] | Lamar Advertising Co Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000137473 [Member] | Iron Mountain Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000137473 [Member] | Packaging Corp of America [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000137473 [Member] | Jefferies Financial Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000137473 [Member] | Popular Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000137473 [Member] | Ares Management Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000137473 [Member] | Corebridge Financial Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000137473 [Member] | Simon Property Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000137473 [Member] | OneMain Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000137473 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000137473 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000137473 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000137473 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000137473 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000137473 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.10% |
| C000137473 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 45.30% |
| C000137473 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.40% |
| C000137473 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000138164 [Member] | First Trust NASDAQ 100 Technology Sector Index Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20% |
| C000138164 [Member] | First Trust Industrials Producer Durables AlphaDEX Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000138164 [Member] | First Trust Dow Jones Internet Index Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.90% |
| C000138164 [Member] | First Trust Consumer Discretionary AlphaDEX Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000138164 [Member] | Dreyfus Government Cash Management Fund Institutional Shares [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000138164 [Member] | First Trust Nasdaq Semiconductor ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.70% |
| C000144324 [Member] | Dreyfus Government Cash Management Fund Institutional Shares [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000144324 [Member] | First Trust United Kingdom AlphaDEX Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000144324 [Member] | First Trust India NIFTY 50 Equal Weight ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.20% |
| C000144324 [Member] | First Trust Japan AlphaDEX Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.80% |
| C000144324 [Member] | First Trust Switzerland AlphaDEX Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.80% |
| C000144324 [Member] | First Trust Eurozone AlphaDEX ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.60% |
| C000162607 [Member] | First Trust NASDAQ 100 Technology Sector Index Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20% |
| C000162607 [Member] | First Trust Industrials Producer Durables AlphaDEX Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000162607 [Member] | First Trust Dow Jones Internet Index Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.90% |
| C000162607 [Member] | First Trust Consumer Discretionary AlphaDEX Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000162607 [Member] | Dreyfus Government Cash Management Fund Institutional Shares [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000162607 [Member] | First Trust Nasdaq Semiconductor ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.70% |
| C000195212 [Member] | Steel Dynamics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | CF Industries Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Chesapeake Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Corebridge Financial Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | A O Smith Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Expeditors International of Washington Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Matson Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Landstar System Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Ralph Lauren Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Westlake Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000195212 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000195212 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000195212 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.70% |
| C000195212 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000195212 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000195212 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.10% |
| C000195212 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 32.40% |
| C000195212 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000195212 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000198271 [Member] | Advanced Micro Devices Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000198271 [Member] | China CITIC Bank Corp Ltd Class H [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000198271 [Member] | Industrial And Commercial Bank of China Ltd Class H [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000198271 [Member] | PayPal Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000198271 [Member] | Infineon Technologies AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000198271 [Member] | JD com Inc ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000198271 [Member] | Baidu Inc ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000198271 [Member] | Alibaba Group Holding Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000198271 [Member] | Intel Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000198271 [Member] | Micron Technology Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000198271 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000198271 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000198271 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.50% |
| C000198271 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000198271 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000198271 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000198271 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000198271 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000198271 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 39.30% |
| C000198271 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000198496 [Member] | Meta Platforms Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000198496 [Member] | Mizuho Financial Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000198496 [Member] | Daiwa Capital Markets America Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000198496 [Member] | Symbotic Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000198496 [Member] | Palantir Technologies Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000198496 [Member] | Bank of America Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000198496 [Member] | Ocado Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000198496 [Member] | Valeo SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000198496 [Member] | PKSHA Technology Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000198496 [Member] | Dynatrace Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000198496 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000198496 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000198496 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 49.60% |
| C000198496 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000198496 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000198496 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000198496 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000198496 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000198496 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000198496 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000203940 [Member] | Republic Services Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000203940 [Member] | Visa Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000203940 [Member] | Mastercard Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000203940 [Member] | Fiserv Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000203940 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000203940 [Member] | Curtiss Wright Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000203940 [Member] | Walmart Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000203940 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000203940 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000203940 [Member] | Otis Worldwide Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000203940 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.50% |
| C000203940 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000203940 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24% |
| C000203940 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000203940 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000203940 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000203940 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000203940 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.90% |
| C000203940 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000203940 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000203941 [Member] | Popular Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000203941 [Member] | Corebridge Financial Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000203941 [Member] | PulteGroup Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000203941 [Member] | Jones Lang LaSalle Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000203941 [Member] | Tenet Healthcare Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000203941 [Member] | Capital One Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000203941 [Member] | Reinsurance Group of America Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000203941 [Member] | Travelers The Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000203941 [Member] | US Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000203941 [Member] | NRG Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000203941 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000203941 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13% |
| C000203941 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000203941 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000203941 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000203941 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000203941 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000203941 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000203941 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 44.10% |
| C000203941 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000223561 [Member] | Aristocrat Leisure Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000223561 [Member] | Unilever PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000223561 [Member] | DSV A S [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000223561 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000223561 [Member] | Obic Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000223561 [Member] | Investor AB Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000223561 [Member] | Swiss Re AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000223561 [Member] | Bunzl PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000223561 [Member] | Industria de Diseno Textil S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000223561 [Member] | Givaudan S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000223561 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000223561 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000223561 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000223561 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000223561 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000223561 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000223561 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000223561 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| C000223561 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.10% |
| C000223561 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.10% |
| C000250760 [Member] | Oracle Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000250760 [Member] | Accenture PLC Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000250760 [Member] | Walmart Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000250760 [Member] | Fortinet Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000250760 [Member] | Lockheed Martin Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000250760 [Member] | Starbucks Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000250760 [Member] | Lowe s Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000250760 [Member] | McDonald s Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000250760 [Member] | UnitedHealth Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000250760 [Member] | Philip Morris International Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000250760 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000250760 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000250760 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 34.80% |
| C000250760 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000250760 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.20% |
| C000250760 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000250760 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.80% |
