| 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 II |
| Entity Central Index Key | 0001364608 |
| 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 II | |
| Entity Central Index Key | 0001364608 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Sep. 30, 2024 | |
| C000051966 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust STOXX®European Select Dividend Index Fund | |
| Class Name | First Trust STOXX®European Select Dividend Index Fund | |
| Trading Symbol | FDD | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust STOXX ® | |
| 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/FDD 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/FDD | |
| 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 STOXX ® $ 0.59 % | |
| Expenses Paid, Amount | $ 65 | |
| 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 20.98% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI Europe Index, which returned 25.23% for the same Period. The United Kingdom (“UK”) had the greatest allocation in the Fund with a weight of 23.7%. The allocation to the UK contributed the most to the Fund’s performance of any country with an 8.3% contribution to the Fund’s return. With a weight of 5.4%, Norway was the country with the most negative contribution to the Fund’s return with -1.4% in performance contribution. The Fund’s currency exposure had a 7.1% 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 STOXX ® 20.98 % 4.97 % 4.11 % STOXX ® 20.96 % 5.26 % 4.39 % STOXX ® 25.67 % 8.98 % 5.74 % MSCI Europe Index 25.23 % 8.90 % 5.59 % | |
| 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/FDD | |
| Net Assets | $ 159,971,431 | |
| Holdings Count | Holding | 31 | |
| Advisory Fees Paid, Amount | $ 660,109 | |
| 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 31 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 NatWest Group PLC 5.3 % ABN AMRO Bank N.V. 4.9 % HSBC Holdings PLC 4.8 % ING Groep N.V. 4.8 % IG Group Holdings PLC 4.6 % Taylor Wimpey PLC 4.4 % Legal & General Group PLC 4.1 % Rio Tinto PLC 3.9 % NN Group N.V. 3.8 % Tele2 AB, Class B 3.8 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings NatWest Group PLC 5.3 % ABN AMRO Bank N.V. 4.9 % HSBC Holdings PLC 4.8 % ING Groep N.V. 4.8 % IG Group Holdings PLC 4.6 % Taylor Wimpey PLC 4.4 % Legal & General Group PLC 4.1 % Rio Tinto PLC 3.9 % NN Group N.V. 3.8 % Tele2 AB, Class B 3.8 % | |
| C000051967 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust AlerianDisruptive Technology Real Estate ETF | |
| Class Name | First Trust AlerianDisruptive Technology Real Estate ETF | |
| Trading Symbol | DTRE | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Alerian Disruptive Technology Real Estate 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/DTRE 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/DTRE | |
| 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 Alerian Disruptive Technology Real Estate ETF $ 0.60 % | |
| Expenses Paid, Amount | $ 66 | |
| Expense Ratio, Percent | 0.60% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 18.88% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI World Real Estate Index, which returned 31.74% for the same Period. The United States was the country with the greatest allocation in the Fund during the Period with an average weight of 75.9%. The allocation to the United States contributed the most to the Fund’s performance of any country with a 16.2% contribution. No country had a material negative return contribution to the Fund’s performance. The Fund’s currency exposure had a 1.4% 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 Alerian Disruptive Technology Real Estate ETF 18.88 % 0.41 % 3.65 % Alerian Disruptive Technology Real Estate Index (1) (2) 18.78 % N/A N/A FTSE EPRA/NAREIT Developed Index 30.20 % 2.37 % 5.04 % S&P Global REIT Index 30.43 % 2.54 % 4.92 % MSCI World REIT Index 33.56 % 3.52 % 6.16 % MSCI World Real Estate Index (2) 31.74 % 2.74 % N/A MSCI World Index 32.43 % 13.04 % 10.07 % (1) On September 30, 2022, the Fund’s underlying index changed from the FTSE EPRA/NAREIT Developed Index to the Alerian Disruptive Technology Real Estate Index. Therefore, the Fund’s performance and historical returns shown for periods prior to this date are not necessarily indicative of the performance the Fund, based on this current index, would have generated. (2) Performance data is not available for all the periods shown in the table for the index because performance data does not exist for some of the entire periods. | |
| 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 30, 2022, the Fund’s underlying index changed from the FTSE EPRA/NAREIT Developed Index to the Alerian Disruptive Technology Real Estate Index. Therefore, the Fund’s performance and historical returns shown for periods prior to this date are not necessarily indicative of the performance the Fund, based on this current index, would have generated. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/DTRE | |
| Net Assets | $ 19,544,650 | |
| Holdings Count | Holding | 27 | |
| Advisory Fees Paid, Amount | $ 116,594 | |
| Investment Company Portfolio Turnover | 28% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 27 Total advisory fee paid $ Portfolio turnover rate 28 % | |
| 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 Crown Castle, Inc. 7.1 % SBA Communications Corp. 7.0 % American Tower Corp. 6.9 % Equinix, Inc. 6.8 % Prologis, Inc. 6.4 % Digital Realty Trust, Inc. 6.3 % Mapletree Logistics Trust 4.6 % First Industrial Realty Trust, Inc. 4.4 % STAG Industrial, Inc. 4.2 % Americold Realty Trust, Inc. 4.1 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Crown Castle, Inc. 7.1 % SBA Communications Corp. 7.0 % American Tower Corp. 6.9 % Equinix, Inc. 6.8 % Prologis, Inc. 6.4 % Digital Realty Trust, Inc. 6.3 % Mapletree Logistics Trust 4.6 % First Industrial Realty Trust, Inc. 4.4 % STAG Industrial, Inc. 4.2 % Americold Realty Trust, Inc. 4.1 % | |
| C000054156 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dow JonesGlobal Select Dividend Index Fund | |
| Class Name | First Trust Dow JonesGlobal Select Dividend Index Fund | |
| Trading Symbol | FGD | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dow Jones Global Select 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/FGD 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/FGD | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow Jones Global Select Dividend Index Fund $ 0.56 % | |
| Expenses Paid, Amount | $ 63 | |
| Expense Ratio, Percent | 0.56% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 24.83% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI World Index, which returned 32.43% for the same Period. The country with the greatest allocation in the Fund was Canada with a weight of 13.5%. However, the country with the greatest contribution to the Fund’s return was South Korea with a performance contribution of 5.5%. The country with the most negative contribution to the Fund’s return was Norway with -0.4%. 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 Dow Jones Global Select Dividend Index Fund 24.83 % 7.55 % 4.68 % Dow Jones Global Select Dividend Index 25.09 % 7.86 % 4.88 % Dow Jones World Developed Markets Index SM 31.74 % 12.74 % 10.01 % MSCI World Index 32.43 % 13.04 % 10.07 % | |
| 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/FGD | |
| Net Assets | $ 566,743,125 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,286,619 | |
| 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 100 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 Hapag-Lloyd AG 3.3 % Fortum Oyj 1.8 % CaixaBank S.A. 1.7 % D/S Norden A/S 1.7 % Phoenix Group Holdings PLC 1.6 % Altria Group, Inc. 1.6 % British American Tobacco PLC 1.6 % Telia Co., AB 1.5 % Bankinter S.A. 1.4 % Peyto Exploration & Development Corp. 1.4 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings Hapag-Lloyd AG 3.3 % Fortum Oyj 1.8 % CaixaBank S.A. 1.7 % D/S Norden A/S 1.7 % Phoenix Group Holdings PLC 1.6 % Altria Group, Inc. 1.6 % British American Tobacco PLC 1.6 % Telia Co., AB 1.5 % Bankinter S.A. 1.4 % Peyto Exploration & Development Corp. 1.4 % | |
| C000066484 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Global Wind Energy ETF | |
| Class Name | First Trust Global Wind Energy ETF | |
| Trading Symbol | FAN | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Global Wind Energy 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/FAN 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/FAN | |
| 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 Global Wind Energy 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 26.18% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI World Index, which returned 32.43% for the same Period. The Utilities sector received the greatest allocation of any sector in the Fund with an average weight of 58.0% during the Period. However, the greatest contribution to the Fund’s return of 15.5% came from the Industrials sector with a 37.1% weight in the Fund. No sectors had a materially negative contribution to the Fund’s return. The Fund’s currency exposure had a 3.8% 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 Global Wind Energy ETF 26.18 % 8.40 % 7.21 % ISE Clean Edge Global Wind Energy TM 27.22 % 9.29 % 8.08 % Russell 3000 ® 35.19 % 15.26 % 12.83 % MSCI World Index 32.43 % 13.04 % 10.07 % | |
| 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/FAN | |
| Net Assets | $ 196,539,987 | |
| Holdings Count | Holding | 54 | |
| Advisory Fees Paid, Amount | $ 647,458 | |
| Investment Company Portfolio Turnover | 20% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 54 Total advisory fee paid $ Portfolio turnover rate 20 % | |
| 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 Orsted A/S 7.9 % EDP Renovaveis S.A. 7.3 % Vestas Wind Systems A/S 6.6 % Northland Power, Inc. 5.6 % Bank of America Corp. 4.4 % JPMorgan Chase & Co. 4.2 % China Longyuan Power Group Corp., Ltd., Class H 3.5 % Boralex, Inc., Class A 3.3 % Cadeler A/S 2.9 % Nordex SE 2.7 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Orsted A/S 7.9 % EDP Renovaveis S.A. 7.3 % Vestas Wind Systems A/S 6.6 % Northland Power, Inc. 5.6 % Bank of America Corp. 4.4 % JPMorgan Chase & Co. 4.2 % China Longyuan Power Group Corp., Ltd., Class H 3.5 % Boralex, Inc., Class A 3.3 % Cadeler A/S 2.9 % Nordex SE 2.7 % | |
| C000071160 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust AlerianU.S. NextGen Infrastructure ETF | |
| Class Name | First Trust AlerianU.S. NextGen Infrastructure ETF | |
| Trading Symbol | RBLD | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Alerian U.S. NextGen Infrastructure 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/RBLD. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/RBLD | |
| 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 Alerian U.S. NextGen Infrastructure ETF $ 0.65 % | |
| Expenses Paid, Amount | $ 77 | |
| 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 35.42% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the MSCI World Industrials Index, which returned 34.73% for the same Period. The Industrials sector received the greatest allocation of any sector in the Fund with an average weight of 43.2% during the Period. The allocation to this sector contributed 18.0% to the Fund’s overall return, the greatest contribution of any sector to the Fund’s return during the Period. No sector had a negative contribution to the Fund’s overall 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 Alerian U.S. NextGen Infrastructure ETF 35.42 % 9.64 % 5.32 % Alerian U.S. NextGen Infrastructure Index (1) 36.55 % N/A N/A MSCI World Industrials Index 34.73 % 12.09 % 9.71 % Russell 3000 ® 35.19 % 15.26 % 12.83 % MSCI USA Infrastructure Index 44.28 % 7.19 % 7.80 % (1) On July 29, 2022, the Fund’s underlying index changed from the ISE Global Engineering and Construction 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 July 29, 2022, the Fund’s underlying index changed from the ISE Global Engineering and Construction TM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/RBLD | |
| Net Assets | $ 10,160,342 | |
| Holdings Count | Holding | 102 | |
| Advisory Fees Paid, Amount | $ 57,309 | |
| Investment Company Portfolio Turnover | 26% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 102 Total advisory fee paid $ Portfolio turnover rate 26 % | |
| 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 GE Vernova, Inc. 1.3 % 3M Co. 1.2 % Builders FirstSource, Inc. 1.2 % Vistra Corp. 1.2 % Stanley Black & Decker, Inc. 1.2 % Pentair PLC 1.1 % Comfort Systems USA, Inc. 1.1 % Entergy Corp. 1.1 % Masco Corp. 1.1 % Carrier Global Corp. 1.1 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings GE Vernova, Inc. 1.3 % 3M Co. 1.2 % Builders FirstSource, Inc. 1.2 % Vistra Corp. 1.2 % Stanley Black & Decker, Inc. 1.2 % Pentair PLC 1.1 % Comfort Systems USA, Inc. 1.1 % Entergy Corp. 1.1 % Masco Corp. 1.1 % Carrier Global Corp. 1.1 % | |
| C000081044 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NASDAQ® Clean Edge®Smart Grid Infrastructure Index Fund | |
| Class Name | First Trust NASDAQ® Clean Edge®Smart Grid Infrastructure Index Fund | |
| Trading Symbol | GRID | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust NASDAQ ® ® | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/GRID 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/GRID | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ ® ® $ 0.56 % | |
| Expenses Paid, Amount | $ 66 | |
| Expense Ratio, Percent | 0.56% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 36.62% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the S&P Composite 1500 ® The Electrical Equipment industry received the greatest allocation of any industry in the Fund with an average weight of 38.6% during the Period. The allocation to this industry contributed 21.3% to the Fund’s overall return, which was the greatest contribution of any industry to return during the Period. The most negative contribution to the Fund’s return came from the Automobile Components industry with a -1.4% contribution to return. The Fund’s currency exposure had a 3.2% 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 (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 ® ® 36.62 % 21.98 % 14.90 % Nasdaq Clean Edge Smart Grid Infrastructure TM 37.32 % 22.92 % 15.78 % Russell 3000 ® 35.19 % 15.26 % 12.83 % S&P Composite 1500 ® 34.93 % 14.19 % 12.02 % MSCI World Industrials Index 34.73 % 12.09 % 9.71 % | |
| 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/GRID | |
| Net Assets | $ 1,846,690,043 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 4,538,693 | |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 104 Total advisory fee paid $ Portfolio turnover rate 13 % | |
| 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 Eaton Corp. PLC 8.3 % Johnson Controls International PLC 8.1 % National Grid PLC 8.0 % Schneider Electric SE 7.9 % ABB Ltd. 7.7 % Quanta Services, Inc. 4.1 % Hubbell, Inc. 3.8 % Prysmian S.p.A. 3.6 % Aptiv PLC 3.0 % Samsung SDI Co., Ltd. 2.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Eaton Corp. PLC 8.3 % Johnson Controls International PLC 8.1 % National Grid PLC 8.0 % Schneider Electric SE 7.9 % ABB Ltd. 7.7 % Quanta Services, Inc. 4.1 % Hubbell, Inc. 3.8 % Prysmian S.p.A. 3.6 % Aptiv PLC 3.0 % Samsung SDI Co., Ltd. 2.4 % | |
| C000087410 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Indxx Global Natural Resources Income ETF | |
| Class Name | First Trust Indxx Global Natural Resources Income ETF | |
| Trading Symbol | FTRI | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Indxx Global Natural Resources 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/FTRI 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/FTRI | |
| 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 Global Natural Resources Income ETF $ 0.70 % | |
| Expenses Paid, Amount | $ 74 | |
| Expense Ratio, Percent | 0.70% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 12.11% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI ACWI Materials Index, which returned 20.71% for the same Period. The Oil, Gas & Consumable Fuels industry received the greatest allocation of any industry in the Fund with an average weight of 37.0% during the Period. However, the greatest contribution to the Fund’s return was 10.5% which came from the Metals & Mining industry which had a weight of 23.9% in the Fund. The most negative contributions to the Fund’s return came from the Chemicals industry and the Food Products industry, each with a -1.5% contribution to the Fund’s return. The Fund’s currency exposure had a 1.3% 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 Indxx Global Natural Resources Income ETF 12.11 % 9.96 % 0.36 % Indxx Global Natural Resources Income Index (1) 13.22 % 11.18 % N/A MSCI ACWI Materials Index 20.71 % 10.23 % 6.64 % MSCI ACWI Index 31.76 % 12.19 % 9.39 % (1) Effective on the close of business on December 18, 2015, the Fund’s underlying index changed from the ISE Global Copper 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] | Effective on the close of business on December 18, 2015, the Fund’s underlying index changed from the ISE Global Copper TM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTRI | |
| Net Assets | $ 138,577,561 | |
| Holdings Count | Holding | 50 | |
| Advisory Fees Paid, Amount | $ 1,343,301 | |
| Investment Company Portfolio Turnover | 71% | |
| 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 71 % | |
| 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 Freeport-McMoRan, Inc. 10.2 % Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 8.7 % Canadian Natural Resources Ltd. 8.7 % Agnico Eagle Mines Ltd. 8.0 % American Water Works Co., Inc. 5.7 % Weyerhaeuser Co. 4.2 % Nutrien Ltd. 4.0 % Ecopetrol S.A., ADR 3.8 % Pentair PLC 3.3 % CF Industries Holdings, Inc. 3.1 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Freeport-McMoRan, Inc. 10.2 % Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 8.7 % Canadian Natural Resources Ltd. 8.7 % Agnico Eagle Mines Ltd. 8.0 % American Water Works Co., Inc. 5.7 % Weyerhaeuser Co. 4.2 % Nutrien Ltd. 4.0 % Ecopetrol S.A., ADR 3.8 % Pentair PLC 3.3 % CF Industries Holdings, Inc. 3.1 % | |
| C000087411 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Indxx Global Agriculture ETF | |
| Class Name | First Trust Indxx Global Agriculture ETF | |
| Trading Symbol | FTAG | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Indxx Global Agriculture 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/FTAG 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/FTAG | |
| 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 Global Agriculture ETF $ 0.70 % | |
| Expenses Paid, Amount | $ 71 | |
| 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 2.27% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI ACWI Materials Index, which returned 20.71% for the same Period. The Chemicals industry received the greatest allocation of any industry in the Fund with an average weight of 49.1% during the Period. However, the greatest contribution to the Fund’s return came from the Automobiles industry which had a return of 4.7% and only a 6.4% weight in the Fund. The most negative contribution to the Fund’s return came from the Pharmaceuticals industry with a -3.3% contribution to the Fund’s return. 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 (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 Indxx Global Agriculture ETF 2.27 % 4.89 % -5.54 % Indxx Global Agriculture Index (1) 4.45 % 6.34 % N/A MSCI ACWI Index 31.76 % 12.19 % 9.39 % MSCI ACWI Materials Index 20.71 % 10.23 % 6.64 % (1) Effective on the close of business on December 18, 2015, the Fund’s underlying index changed from the ISE Global Platinum 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] | Effective on the close of business on December 18, 2015, the Fund’s underlying index changed from the ISE Global Platinum TM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTAG | |
| Net Assets | $ 6,269,656 | |
| Holdings Count | Holding | 51 | |
| Advisory Fees Paid, Amount | $ 66,595 | |
| Investment Company Portfolio Turnover | 11% | |
| 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 11 % | |
| 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 Deere & Co. 9.8 % BASF SE 9.3 % Mahindra & Mahindra Ltd. 9.0 % Corteva, Inc. 8.0 % Bayer AG 4.7 % Nutrien Ltd. 4.4 % Industries Qatar QSC 4.2 % Kubota Corp. 3.4 % Wilmar International Ltd. 3.3 % CF Industries Holdings, Inc. 3.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Deere & Co. 9.8 % BASF SE 9.3 % Mahindra & Mahindra Ltd. 9.0 % Corteva, Inc. 8.0 % Bayer AG 4.7 % Nutrien Ltd. 4.4 % Industries Qatar QSC 4.2 % Kubota Corp. 3.4 % Wilmar International Ltd. 3.3 % CF Industries Holdings, Inc. 3.2 % | |
| C000092838 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Indxx NextG ETF | |
| Class Name | First Trust Indxx NextG ETF | |
| Trading Symbol | NXTG | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Indxx NextG 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/NXTG 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/NXTG | |
| 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 NextG ETF $ 0.70 % | |
| Expenses Paid, Amount | $ 81 | |
| 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 31.44% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI ACWI Information Technology Index, which returned 48.35% for the same Period. The industry with the greatest allocation in the Fund during the Period was the Semiconductors & Semiconductor Equipment industry. This industry received an average weight of 24.7% and contributed 10.5% to the Fund’s overall return, which was the greatest contribution to return of any industry in the Fund. The only industry with a negative contribution to the Fund’s return was the Software industry, with a contribution of only ‑0.3%. The Fund’s currency exposure had a 2.3% 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 Indxx NextG ETF 31.44 % 13.78 % 10.65 % Indxx 5G & NextG Thematic Index SM (1) (2) 32.82 % 15.00 % N/A MSCI ACWI Information Technology Index 48.35 % 22.78 % 19.12 % MSCI ACWI Index 31.76 % 12.19 % 9.39 % (1) On May 30, 2019, the Fund’s underlying index changed from the Nasdaq CTA Smartphone TM SM (2) Performance data is not available for all the periods shown in the table for the index because performance data does not exist for some of the entire periods. | |
| 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 May 30, 2019, the Fund’s underlying index changed from the Nasdaq CTA Smartphone TM SM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/NXTG | |
| Net Assets | $ 385,646,317 | |
| Holdings Count | Holding | 103 | |
| Advisory Fees Paid, Amount | $ 2,693,527 | |
| 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 103 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 Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 3.9 % Xiaomi Corp., Class B 1.5 % Fujitsu Ltd. 1.5 % F5, Inc. 1.5 % International Business Machines Corp. 1.5 % Ciena Corp. 1.4 % Infosys Ltd., ADR 1.4 % HCL Technologies Ltd. 1.4 % Arista Networks, Inc. 1.4 % SBA Communications Corp. 1.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 3.9 % Xiaomi Corp., Class B 1.5 % Fujitsu Ltd. 1.5 % F5, Inc. 1.5 % International Business Machines Corp. 1.5 % Ciena Corp. 1.4 % Infosys Ltd., ADR 1.4 % HCL Technologies Ltd. 1.4 % Arista Networks, Inc. 1.4 % SBA Communications Corp. 1.4 % | |
| C000101722 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust S-Network Future Vehicles & Technology ETF | |
| Class Name | First Trust S-Network Future Vehicles & Technology ETF | |
| Trading Symbol | CARZ | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust S-Network Future Vehicles & Technology 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/CARZ 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/CARZ | |
| 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-Network Future Vehicles & Technology ETF $ 0.70 % | |
| Expenses Paid, Amount | $ 75 | |
| 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 14.87% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI ACWI Index, which returned 31.76% for the same Period. The Semiconductors & Semiconductor Equipment industry received the greatest allocation, with an average weight in the Fund of 39.3%. The allocation to this industry contributed 14.2% to the Fund’s overall return, which was the greatest contribution of any industry to the Fund’s return. The industry with the most negative contribution to the Fund’s return was the Automobile Components industry which contributed -1.7% to the Fund’s overall return. The Fund’s currency exposure had a 1.3% 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-Network Future Vehicles & Technology ETF 14.87 % 14.50 % 6.48 % S-Network Electric & Future Vehicle Ecosystem Index (1) 15.23 % N/A N/A MSCI ACWI Index 31.76 % 12.19 % 9.39 % (1) On January 26, 2022, the Fund’s underlying index changed from the Nasdaq Global Auto 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 January 26, 2022, the Fund’s underlying index changed from the Nasdaq Global Auto TM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/CARZ | |
| Net Assets | $ 35,140,044 | |
| Holdings Count | Holding | 103 | |
| Advisory Fees Paid, Amount | $ 263,891 | |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 103 Total advisory fee paid $ Portfolio turnover rate 32 % | |
| 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 Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 5.0 % Tesla, Inc. 4.9 % Apple, Inc. 4.6 % NVIDIA Corp. 4.3 % Microsoft Corp. 4.3 % Taiwan Semiconductor Manufacturing Co., Ltd., ADR 4.3 % Advanced Micro Devices, Inc. 4.1 % Alphabet, Inc., Class A 4.1 % QUALCOMM, Inc. 3.9 % Samsung Electronics Co., Ltd. 3.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 5.0 % Tesla, Inc. 4.9 % Apple, Inc. 4.6 % NVIDIA Corp. 4.3 % Microsoft Corp. 4.3 % Taiwan Semiconductor Manufacturing Co., Ltd., ADR 4.3 % Advanced Micro Devices, Inc. 4.1 % Alphabet, Inc., Class A 4.1 % QUALCOMM, Inc. 3.9 % Samsung Electronics Co., Ltd. 3.4 % | |
| C000102221 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Cloud Computing ETF | |
| Class Name | First Trust Cloud Computing ETF | |
| Trading Symbol | SKYY | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Cloud Computing 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/SKYY 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/SKYY | |
| 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 Cloud Computing 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 34.76% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Software industry received the greatest allocation in the Fund, with an average weight of 49.5%. The allocation to this industry contributed 14.9% 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 Cloud Computing ETF 34.76 % 12.94 % 14.55 % ISE CTA Cloud Computing TM (1) 35.62 % 13.61 % 15.19 % S&P 500 ® 36.35 % 15.98 % 13.38 % S&P Composite 1500 ® 51.73 % 26.22 % 22.04 % (1) On June 24, 2019, the Fund’s underlying index changed its methodology and changed its name from “ISE Cloud Computing TM 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 June 24, 2019, the Fund’s underlying index changed its methodology and changed its name from “ISE Cloud Computing TM TM | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/SKYY | |
| Net Assets | $ 2,977,532,478 | |
| Holdings Count | Holding | 65 | |
| Advisory Fees Paid, Amount | $ 17,358,724 | |
| Investment Company Portfolio Turnover | 35% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 65 Total advisory fee paid $ Portfolio turnover rate 35 % | |
| 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 Oracle Corp. 4.5 % Lumen Technologies, Inc. 4.2 % International Business Machines Corp. 4.0 % Arista Networks, Inc. 4.0 % Amazon.com, Inc. 3.9 % Microsoft Corp. 3.8 % Alphabet, Inc., Class A 3.8 % Pure Storage, Inc., Class A 3.6 % Nutanix, Inc., Class A 3.5 % MongoDB, Inc. 2.9 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings Oracle Corp. 4.5 % Lumen Technologies, Inc. 4.2 % International Business Machines Corp. 4.0 % Arista Networks, Inc. 4.0 % Amazon.com, Inc. 3.9 % Microsoft Corp. 3.8 % Alphabet, Inc., Class A 3.8 % Pure Storage, Inc., Class A 3.6 % Nutanix, Inc., Class A 3.5 % MongoDB, Inc. 2.9 % | |
| C000146603 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust InternationalEquity Opportunities ETF | |
| Class Name | First Trust InternationalEquity Opportunities ETF | |
| Trading Symbol | FPXI | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust International Equity Opportunities 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/FPXI 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/FPXI | |
| 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 Equity Opportunities ETF $ 0.70 % | |
| Expenses Paid, Amount | $ 80 | |
| 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 27.15% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the MSCI ACWI ex USA Index, which returned 25.35% for the same Period. The Fund’s greatest allocation was 19.5% to the Consumer Discretionary sector, and investments in this sector contributed 4.7% to the Fund’s performance. With a weight of 16.9%, the sector with the greatest return contribution to the Fund was the Information Technology sector at 8.5%. The only negatively contributing sector was the Energy sector, which received an allocation of 2.1% and caused a -0.3% drag on the Fund’s return. The Fund’s currency exposure had a 2.8% 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 (November 4, 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 Since First Trust International Equity Opportunities ETF 27.15 % 6.67 % 6.02 % IPOX ® 28.35 % 7.66 % 6.91 % MSCI ACWI ex USA Index 25.35 % 7.59 % 5.47 % | |
| Performance Inception Date | Nov. 04, 2014 | |
| 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/FPXI | |
| Net Assets | $ 145,506,998 | |
| Holdings Count | Holding | 51 | |
| Advisory Fees Paid, Amount | $ 1,111,523 | |
| Investment Company Portfolio Turnover | 106% | |
| 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 106 % | |
| 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 ARM Holdings PLC, ADR 7.1 % Spotify Technology S.A. 5.2 % Monday.com Ltd. 4.9 % InPost S.A. 4.2 % Nordnet AB publ 4.2 % NU Holdings Ltd., Class A 4.1 % Sandoz Group AG 4.0 % Aristocrat Leisure Ltd. 3.8 % UCB S.A. 3.5 % TDK Corp. 3.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings ARM Holdings PLC, ADR 7.1 % Spotify Technology S.A. 5.2 % Monday.com Ltd. 4.9 % InPost S.A. 4.2 % Nordnet AB publ 4.2 % NU Holdings Ltd., Class A 4.1 % Sandoz Group AG 4.0 % Aristocrat Leisure Ltd. 3.8 % UCB S.A. 3.5 % TDK Corp. 3.4 % | |
| C000159087 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Nasdaq Cybersecurity ETF | |
| Class Name | First Trust Nasdaq Cybersecurity ETF | |
| Trading Symbol | CIBR | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Cybersecurity 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/CIBR 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/CIBR | |
| 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 Cybersecurity 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 31.12% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P Composite 1500 ® The Fund allocated 52.1% to the Software industry and investments in this industry contributed 16.0% to the Fund’s overall return, which was more than any other industry. No industry had a negative contribution to the Fund’s return. The Fund’s currency exposure had a 0.3% 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 (July 6, 2015 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 Cybersecurity ETF 31.12 % 17.31 % 13.13 % Nasdaq CTA Cybersecurity TM 31.83 % 18.15 % 13.93 % S&P 500 ® 36.35 % 15.98 % 13.78 % S&P Composite 1500 ® 51.73 % 26.22 % 23.13 % | |
| Performance Inception Date | Jul. 06, 2015 | |
| 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/CIBR | |
| Net Assets | $ 6,601,960,374 | |
| Holdings Count | Holding | 34 | |
| Advisory Fees Paid, Amount | $ 36,419,444 | |
| Investment Company Portfolio Turnover | 39% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 34 Total advisory fee paid $ Portfolio turnover rate 39 % | |
| 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 Broadcom, Inc. 8.4 % Cisco Systems, Inc. 8.3 % CrowdStrike Holdings, Inc., Class A 8.0 % Infosys Ltd., ADR 7.5 % Palo Alto Networks, Inc. 7.4 % Leidos Holdings, Inc. 4.1 % Booz Allen Hamilton Holding Corp. 4.0 % Fortinet, Inc. 4.0 % Check Point Software Technologies Ltd. 4.0 % Akamai Technologies, Inc. 3.9 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Broadcom, Inc. 8.4 % Cisco Systems, Inc. 8.3 % CrowdStrike Holdings, Inc., Class A 8.0 % Infosys Ltd., ADR 7.5 % Palo Alto Networks, Inc. 7.4 % Leidos Holdings, Inc. 4.1 % Booz Allen Hamilton Holding Corp. 4.0 % Fortinet, Inc. 4.0 % Check Point Software Technologies Ltd. 4.0 % Akamai Technologies, Inc. 3.9 % | |
| C000204700 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust IPOX®Europe Equity Opportunities ETF | |
| Class Name | First Trust IPOX®Europe Equity Opportunities ETF | |
| Trading Symbol | FPXE | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust IPOX ® | |
| 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/FPXE 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/FPXE | |
| 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 IPOX ® $ 0.70 % | |
| Expenses Paid, Amount | $ 81 | |
| 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 31.38% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the MSCI Europe Index, which returned 25.23% for the same Period. The sector with the greatest allocation was the Consumer Discretionary sector at 21.9%. This sector contributed 7.1% to the Fund’s return. The greatest contribution to return, however, came from investments in the Information Technology sector, which received an allocation of 12.2% and contributed 8.1% to the Fund’s overall return. No sector contributed negatively to the Fund’s return. The Fund’s currency exposure had a 4.8% 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 (October 4, 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 IPOX ® 31.38 % 8.08 % 6.94 % IPOX ® 32.80 % 9.33 % 8.19 % MSCI Europe Index 25.23 % 8.90 % 7.54 % | |
| Performance Inception Date | Oct. 04, 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/FPXE | |
| Net Assets | $ 4,005,212 | |
| Holdings Count | Holding | 102 | |
| Advisory Fees Paid, Amount | $ 30,506 | |
| Investment Company Portfolio Turnover | 107% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 102 Total advisory fee paid $ Portfolio turnover rate 107 % | |
| 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 ARM Holdings PLC, ADR 6.6 % Monday.com Ltd. 4.3 % Nordnet AB publ 4.1 % Spotify Technology S.A. 4.1 % Gen Digital, Inc. 3.7 % On Holding AG, Class A 3.5 % InPost S.A. 3.3 % UCB S.A. 3.1 % BoneSupport Holding AB 2.6 % Munters Group AB 2.6 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings ARM Holdings PLC, ADR 6.6 % Monday.com Ltd. 4.3 % Nordnet AB publ 4.1 % Spotify Technology S.A. 4.1 % Gen Digital, Inc. 3.7 % On Holding AG, Class A 3.5 % InPost S.A. 3.3 % UCB S.A. 3.1 % BoneSupport Holding AB 2.6 % Munters Group AB 2.6 % | |
| C000205597 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dow JonesInternational Internet ETF | |
| Class Name | First Trust Dow JonesInternational Internet ETF | |
| Trading Symbol | FDNI | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Dow Jones International Internet 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/FDNI 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/FDNI | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow Jones International Internet ETF $ 0.65 % | |
| Expenses Paid, Amount | $ 78 | |
| 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 41.14% during the 12 months ended September 30, 2024. The Fund outperformed its benchmark, the MSCI ACWI ex-USA Information Technology Index, which returned 38.32% for the same Period. Nearly 95% of the Fund’s assets were allocated across three sectors. The Consumer Discretionary sector had an allocation of 46.6%, the Communication Services sector had an allocation of 35.4%, and the Information Technology sector had an allocation of 12.7%. The greatest contribution to the Fund’s return came from the allocation to the Consumer Discretionary sector, with a 21.4% contribution. The most negative contribution to the Fund’s return came from investments in the Health Care sector which caused a -0.4% drag on the Fund’s overall return. The Fund’s currency exposure had a 2.9% 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 (November 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 Dow Jones International Internet ETF 41.14 % 7.47 % 7.87 % Dow Jones International Internet Index 42.64 % 8.31 % 8.70 % MSCI ACWI ex-USA Information Technology Index 38.32 % 14.79 % 15.17 % MSCI ACWI ex-USA Index 25.35 % 7.59 % 7.42 % | |
| Performance Inception Date | Nov. 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/FDNI | |
| Net Assets | $ 41,311,383 | |
| Holdings Count | Holding | 41 | |
| Advisory Fees Paid, Amount | $ 183,547 | |
| Investment Company Portfolio Turnover | 33% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 41 Total advisory fee paid $ Portfolio turnover rate 33 % | |
| 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 Alibaba Group Holding Ltd. 11.7 % Meituan, Class B 11.0 % Tencent Holdings Ltd. 10.4 % JD.com, Inc., Class A 5.5 % Prosus N.V. 5.5 % PDD Holdings, Inc., ADR 5.0 % Shopify, Inc., Class A 5.0 % Spotify Technology S.A. 4.9 % Adyen N.V. 4.4 % Naspers Ltd., Class N 3.9 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Alibaba Group Holding Ltd. 11.7 % Meituan, Class B 11.0 % Tencent Holdings Ltd. 10.4 % JD.com, Inc., Class A 5.5 % Prosus N.V. 5.5 % PDD Holdings, Inc., ADR 5.0 % Shopify, Inc., Class A 5.0 % Spotify Technology S.A. 4.9 % Adyen N.V. 4.4 % Naspers Ltd., Class N 3.9 % | |
| C000234334 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Indxx Metaverse ETF | |
| Class Name | First Trust Indxx Metaverse ETF | |
| Trading Symbol | ARVR | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Indxx Metaverse 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/ARVR 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/ARVR | |
| 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 Metaverse ETF $ 0.70 % | |
| Expenses Paid, Amount | $ 81 | |
| 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 30.01% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI ACWI Index, which returned 31.76% for the same Period. The Information Technology sector received an allocation of 55.9% and contributed 17.8% to the Fund’s return, the largest of any sector for both allocation and contribution to return. The only negatively contributing sector was the Health Care sector in which the Fund held only one security that caused a -0.8% contribution to the Fund’s overall return. The Fund’s currency exposure had a 1.5% 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 (April 19, 2022 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 Indxx Metaverse ETF 30.01 % 9.76 % Indxx Metaverse Index 31.31 % 10.77 % MSCI ACWI Index 31.76 % 10.64 % | |
| Performance Inception Date | Apr. 19, 2022 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/ARVR | |
| Net Assets | $ 3,778,151 | |
| Holdings Count | Holding | 43 | |
| Advisory Fees Paid, Amount | $ 17,421 | |
| Investment Company Portfolio Turnover | 39% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 43 Total advisory fee paid $ Portfolio turnover rate 39 % | |
| 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 Xiaomi Corp., Class B 4.2 % Zoom Video Communications, Inc., Class A 3.8 % Tencent Holdings Ltd. 3.6 % ROBLOX Corp., Class A 3.5 % Meta Platforms, Inc., Class A 3.4 % Netflix, Inc. 3.3 % NetEase, Inc. 3.3 % Texas Instruments, Inc. 3.2 % Apple, Inc. 3.1 % Take-Two Interactive Software, Inc. 3.1 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Xiaomi Corp., Class B 4.2 % Zoom Video Communications, Inc., Class A 3.8 % Tencent Holdings Ltd. 3.6 % ROBLOX Corp., Class A 3.5 % Meta Platforms, Inc., Class A 3.4 % Netflix, Inc. 3.3 % NetEase, Inc. 3.3 % Texas Instruments, Inc. 3.2 % Apple, Inc. 3.1 % Take-Two Interactive Software, Inc. 3.1 % | |
| C000234707 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NasdaqLux Digital Health Solutions ETF | |
| Class Name | First Trust NasdaqLux Digital Health Solutions ETF | |
| Trading Symbol | EKG | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Nasdaq Lux Digital Health Solutions 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/EKG 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/EKG | |
| 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 Lux Digital Health Solutions ETF $ 0.65 % | |
| Expenses Paid, Amount | $ 72 | |
| 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 21.01% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the S&P Composite 1500 ® The Health Care Equipment & Supplies industry received the greatest allocation in the Fund with an average weight of 52.8% and a contribution to the Fund’s return of 14.0%, which was the greatest of any industry. The Health Care Providers and Services industry was the only negatively contributing sector in the Fund with a contribution of -0.3% 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 (March 22, 2022 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 Nasdaq Lux Digital Health Solutions ETF 21.01 % -6.93 % Nasdaq Lux Health Tech TM 21.79 % -6.33 % Russell 3000 ® 35.19 % 10.94 % S&P Composite 1500 ® 21.46 % 6.08 % | |
| Performance Inception Date | Mar. 22, 2022 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/EKG | |
| Net Assets | $ 2,557,536 | |
| Holdings Count | Holding | 39 | |
| Advisory Fees Paid, Amount | $ 14,346 | |
| Investment Company Portfolio Turnover | 16% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 39 Total advisory fee paid $ Portfolio turnover rate 16 % | |
| 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 Intuitive Surgical, Inc. 7.8 % ResMed, Inc. 7.8 % Veeva Systems, Inc., Class A 7.6 % Dexcom, Inc. 7.6 % IQVIA Holdings, Inc. 7.4 % Insulet Corp. 4.5 % Exact Sciences Corp. 4.3 % Natera, Inc. 4.2 % Align Technology, Inc. 4.2 % Hologic, Inc. 3.9 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Intuitive Surgical, Inc. 7.8 % ResMed, Inc. 7.8 % Veeva Systems, Inc., Class A 7.6 % Dexcom, Inc. 7.6 % IQVIA Holdings, Inc. 7.4 % Insulet Corp. 4.5 % Exact Sciences Corp. 4.3 % Natera, Inc. 4.2 % Align Technology, Inc. 4.2 % Hologic, Inc. 3.9 % | |
| C000240529 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust BloombergEmerging Market Democracies ETF | |
| Class Name | First Trust BloombergEmerging Market Democracies ETF | |
| Trading Symbol | EMDM | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Bloomberg Emerging Market Democracies 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/EMDM 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/EMDM | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Bloomberg Emerging Market Democracies ETF $ 0.75 % | |
| Expenses Paid, Amount | $ 84 | |
| Expense Ratio, Percent | 0.75% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 23.28% during the 12 months ended September 30, 2024. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 26.05% for the same Period. The Fund gave a nearly equal allocation to investments in six countries: Taiwan at 16.2%, India at 15.2%, South Africa at 14.8%, South Korea at 14.5%, Brazil at 14.4%, and Mexico at 14.1%. The greatest contributor to the Fund’s return were investments in Taiwan, which contributed 9.5% to Fund’s overall return. The greatest drag on Fund performance came from Chile. The Fund invested in only one Chilean security which contributed | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (March 2, 2023 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 Bloomberg Emerging Market Democracies ETF 23.28 % 14.75 % Bloomberg Emerging Market Democracies Index 25.94 % 17.25 % MSCI Emerging Markets Index 26.05 % 15.23 % | |
| Performance Inception Date | Mar. 02, 2023 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/EMDM | |
| Net Assets | $ 8,299,720 | |
| Holdings Count | Holding | 101 | |
| Advisory Fees Paid, Amount | $ 48,470 | |
| Investment Company Portfolio Turnover | 22% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 101 Total advisory fee paid $ Portfolio turnover rate 22 % | |
| 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 Taiwan Semiconductor Manufacturing Co., Ltd. 11.4 % Naspers Ltd., Class N 7.7 % Samsung Electronics Co., Ltd. 5.9 % FirstRand Ltd. 4.9 % Standard Bank Group Ltd. 3.8 % Grupo Mexico S.A.B. de C.V. 3.2 % Capitec Bank Holdings Ltd. 3.1 % Petroleo Brasileiro S.A. 2.9 % Powszechna Kasa Oszczednosci Bank Polski S.A. 2.8 % America Movil S.A.B. de C.V. 2.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Taiwan Semiconductor Manufacturing Co., Ltd. 11.4 % Naspers Ltd., Class N 7.7 % Samsung Electronics Co., Ltd. 5.9 % FirstRand Ltd. 4.9 % Standard Bank Group Ltd. 3.8 % Grupo Mexico S.A.B. de C.V. 3.2 % Capitec Bank Holdings Ltd. 3.1 % Petroleo Brasileiro S.A. 2.9 % Powszechna Kasa Oszczednosci Bank Polski S.A. 2.8 % America Movil S.A.B. de C.V. 2.2 % | |
| C000245005 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Emerging MarketsHuman Flourishing ETF | |
| Class Name | First Trust Emerging MarketsHuman Flourishing ETF | |
| Trading Symbol | FTHF | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Emerging Markets Human Flourishing ETF (the “Fund”) for the period of October 30, 2023 (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/FTHF 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/FTHF | |
| 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 Emerging Markets Human Flourishing ETF $ (1) 0.75 % (2) (1) The Fund commenced investment operations on October 30, 2023. 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 | $ 77 | [1] |
| Expense Ratio, Percent | 0.75% | [2] |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 22.00% from the Fund’s inception date on October 30, 2023 through September 30, 2024. The Fund underperformed its benchmark, the MSCI Emerging Markets Index, which returned 30.20% for the same Period. Taiwan was the country with the greatest allocation in the Fund with an average weight of 21.0%. The allocation to investments in Taiwan contributed the most of any country to the Fund’s performance with a 9.9% contribution to the Fund’s return. No country had a materially negative return contribution to the Fund’s overall performance. The Fund’s currency exposure had a 1.1% 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 (October 30, 2023 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 Emerging Markets Human Flourishing ETF 22.00 % Emerging Markets Human Flourishing Index 22.94 % MSCI Emerging Markets Index 30.20 % | |
| Performance Inception Date | Oct. 30, 2023 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FTHF | |
| Net Assets | $ 42,823,683 | |
| Holdings Count | Holding | 101 | |
| Advisory Fees Paid, Amount | $ 216,974 | |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of September 30, 2024) Fund net assets $ Total number of portfolio holdings 101 Total advisory fee paid $ Portfolio turnover rate 30 % | |
| 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 Taiwan Semiconductor Manufacturing Co., Ltd. 10.0 % Samsung Electronics Co., Ltd. 6.2 % Itau Unibanco Holding S.A. 4.7 % Petroleo Brasileiro S.A. 4.5 % Wal-Mart de Mexico S.A.B. de C.V. 3.0 % Grupo Financiero Banorte S.A.B. de C.V., Class O 2.7 % FirstRand Ltd. 2.4 % WEG S.A. 2.2 % SM Investments Corp. 2.0 % Standard Bank Group Ltd. 1.9 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Taiwan Semiconductor Manufacturing Co., Ltd. 10.0 % Samsung Electronics Co., Ltd. 6.2 % Itau Unibanco Holding S.A. 4.7 % Petroleo Brasileiro S.A. 4.5 % Wal-Mart de Mexico S.A.B. de C.V. 3.0 % Grupo Financiero Banorte S.A.B. de C.V., Class O 2.7 % FirstRand Ltd. 2.4 % WEG S.A. 2.2 % SM Investments Corp. 2.0 % Standard Bank Group Ltd. 1.9 % | |
| [1]The Fund commenced investment operations on October 30, 2023. Had the Fund been in operation for a complete fiscal year, the cost of a $10,000 investment would have been higher.[2]Annualized. | ||
| Shareholder Report, Line Graph (Details) - USD ($) | 11 Months Ended | 12 Months Ended | 19 Months Ended | 29 Months Ended | 30 Months Ended | 60 Months Ended | 71 Months Ended | 72 Months Ended | 111 Months Ended | 119 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 | Sep. 30, 2024 | Mar. 31, 2024 | Oct. 30, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Mar. 02, 2023 | Sep. 30, 2022 | Apr. 19, 2022 | Mar. 31, 2022 | Mar. 22, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Nov. 05, 2018 | Oct. 04, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jul. 06, 2015 | Mar. 31, 2015 | Nov. 04, 2014 | Sep. 30, 2014 | ||
| C000051966 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust STOXX® European Select Dividend Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 14,953 | $ 13,631 | $ 12,358 | $ 12,500 | $ 10,005 | $ 13,460 | $ 13,873 | $ 13,660 | $ 9,896 | $ 8,903 | $ 11,732 | $ 11,297 | $ 11,462 | $ 11,663 | $ 11,379 | $ 10,045 | $ 9,568 | $ 9,460 | $ 9,210 | $ 9,829 | $ 10,000 | |||||||||
| Average Annual Return, Percent | 20.98% | 4.97% | 4.11% | |||||||||||||||||||||||||||||||||||||
| C000051967 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Alerian Disruptive Technology Real Estate ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 14,316 | $ 14,316 | 14,316 | 14,316 | 14,316 | $ 14,316 | 14,316 | 14,316 | 14,316 | 14,316 | $ 14,316 | 13,248 | 12,041 | 12,590 | 11,531 | 15,751 | 14,921 | 13,747 | 11,482 | 10,201 | 14,024 | 13,400 | 12,390 | 11,808 | 11,915 | 11,406 | 11,836 | 11,271 | 10,297 | 11,213 | 10,000 | |||||||||
| Average Annual Return, Percent | 18.88% | 0.41% | 3.65% | |||||||||||||||||||||||||||||||||||||
| C000054156 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Dow Jones Global Select Dividend Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | 15,797 | $ 15,797 | 15,797 | 15,797 | 15,797 | $ 15,797 | 15,797 | 15,797 | 15,797 | 15,797 | $ 15,797 | 14,230 | 12,650 | 12,998 | 10,661 | 13,994 | 13,491 | 13,140 | 9,182 | 7,946 | 10,979 | 10,744 | 11,344 | 11,195 | 11,093 | 10,259 | 9,719 | 9,093 | 8,549 | 9,707 | 10,000 | |||||||||
| Average Annual Return, Percent | 24.83% | 7.55% | 4.68% | |||||||||||||||||||||||||||||||||||||
| C000066484 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Global Wind Energy ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 20,056 | $ 20,056 | 20,056 | 20,056 | 20,056 | $ 20,056 | 20,056 | 20,056 | 20,056 | 20,056 | $ 20,056 | 16,914 | 15,898 | 19,324 | 16,259 | 20,882 | 22,100 | 23,371 | 18,151 | 12,542 | 13,402 | 13,162 | 12,457 | 13,066 | 12,832 | 11,998 | 12,081 | 10,493 | 9,263 | 9,624 | 10,000 | |||||||||
| Average Annual Return, Percent | 26.18% | 8.40% | 7.21% | |||||||||||||||||||||||||||||||||||||
| C000071160 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Alerian U.S. NextGen Infrastructure ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 16,785 | $ 16,785 | 16,785 | 16,785 | 16,785 | $ 16,785 | 16,785 | 16,785 | 16,785 | 16,785 | $ 16,785 | 15,338 | 12,398 | 12,136 | 10,486 | 12,944 | 12,755 | 12,913 | 9,798 | 8,178 | 10,594 | 11,103 | 12,560 | 12,441 | 12,353 | 11,196 | 10,433 | 9,850 | 9,282 | 9,743 | 10,000 | |||||||||
| Average Annual Return, Percent | 35.42% | 9.64% | 5.32% | |||||||||||||||||||||||||||||||||||||
| C000081044 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust NASDAQ® Clean Edge® Smart Grid Infrastructure Index Fund | |||||||||||||||||||||||||||||||||||||||
| Account Value | 40,111 | $ 40,111 | 40,111 | 40,111 | 40,111 | $ 40,111 | 40,111 | 40,111 | 40,111 | 40,111 | $ 40,111 | 35,875 | 29,360 | 30,236 | 23,226 | 28,750 | 28,222 | 26,073 | 19,030 | 12,907 | 14,856 | 12,978 | 14,105 | 14,544 | 14,342 | 12,147 | 11,317 | 9,919 | 9,002 | 10,147 | 10,000 | |||||||||
| Average Annual Return, Percent | 36.62% | 21.98% | 14.90% | |||||||||||||||||||||||||||||||||||||
| C000087410 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Indxx Global Natural Resources Income ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 10,370 | $ 10,370 | 10,370 | 10,370 | 10,370 | $ 10,370 | 10,370 | 10,370 | 10,370 | 10,370 | $ 10,370 | 9,916 | 9,251 | 9,364 | 8,396 | 10,710 | 8,129 | 8,006 | 5,690 | 4,826 | 6,451 | 6,659 | 6,749 | 6,472 | 6,074 | 5,620 | 5,260 | 4,908 | 5,250 | 7,841 | 10,000 | |||||||||
| Average Annual Return, Percent | 12.11% | 9.96% | 0.36% | |||||||||||||||||||||||||||||||||||||
| C000087411 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Indxx Global Agriculture ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 5,653 | $ 5,653 | 5,653 | 5,653 | 5,653 | $ 5,653 | 5,653 | 5,653 | 5,653 | 5,653 | $ 5,653 | 5,487 | 5,533 | 6,023 | 5,458 | 6,759 | 5,950 | 6,018 | 4,315 | 3,179 | 4,453 | 4,435 | 4,952 | 4,960 | 5,029 | 4,543 | 3,957 | 3,773 | 4,880 | 8,276 | 10,000 | |||||||||
| Average Annual Return, Percent | 2.27% | 4.89% | (5.54%) | |||||||||||||||||||||||||||||||||||||
| C000092838 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Indxx NextG ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 27,515 | $ 27,515 | 27,515 | 27,515 | 27,515 | $ 27,515 | 27,515 | 27,515 | 27,515 | 27,515 | $ 27,515 | 24,591 | 20,934 | 21,202 | 16,879 | 22,577 | 22,420 | 21,209 | 17,166 | 13,431 | 14,430 | 13,974 | 14,178 | 14,849 | 14,150 | 12,921 | 11,440 | 10,274 | 9,565 | 10,919 | 10,000 | |||||||||
| Average Annual Return, Percent | 31.44% | 13.78% | 10.65% | |||||||||||||||||||||||||||||||||||||
| C000101722 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust S-Network Future Vehicles & Technology ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 18,734 | $ 18,734 | 18,734 | 18,734 | 18,734 | $ 18,734 | 18,734 | 18,734 | 18,734 | 18,734 | $ 18,734 | 18,827 | 16,310 | 16,031 | 12,598 | 17,829 | 17,659 | 17,301 | 11,738 | 7,181 | 9,517 | 9,543 | 10,456 | 11,617 | 11,313 | 10,004 | 9,163 | 9,037 | 8,962 | 10,725 | 10,000 | |||||||||
| Average Annual Return, Percent | 14.87% | 14.50% | 6.48% | |||||||||||||||||||||||||||||||||||||
| C000102221 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Cloud Computing ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 38,897 | $ 38,897 | 38,897 | 38,897 | 38,897 | $ 38,897 | 38,897 | 38,897 | 38,897 | 38,897 | $ 38,897 | 36,372 | 28,864 | 25,449 | 22,924 | 34,369 | 39,751 | 36,065 | 29,540 | 20,507 | 21,170 | 21,558 | 21,051 | 17,943 | 15,500 | 14,278 | 12,601 | 10,889 | 10,304 | 10,714 | 10,000 | |||||||||
| Average Annual Return, Percent | 34.76% | 12.94% | 14.55% | |||||||||||||||||||||||||||||||||||||
| C000146603 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust International Equity Opportunities ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 17,841 | $ 17,841 | 17,841 | 17,841 | 17,841 | $ 17,841 | 17,841 | 17,841 | 17,841 | $ 17,841 | $ 17,841 | 16,905 | 14,032 | 14,823 | 12,906 | 17,567 | 22,956 | 23,365 | 20,185 | 13,086 | 12,920 | 12,308 | 12,352 | 12,949 | 11,952 | 9,913 | 9,432 | 8,864 | 8,526 | 9,798 | $ 10,000 | |||||||||
| Average Annual Return, Percent | 27.15% | 6.67% | 6.02% | |||||||||||||||||||||||||||||||||||||
| C000159087 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Nasdaq Cybersecurity ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 31,259 | $ 31,259 | 31,259 | 31,259 | 31,259 | $ 31,259 | 31,259 | 31,259 | $ 31,259 | $ 31,259 | 31,259 | 29,659 | 23,841 | 22,394 | 20,154 | 27,647 | 25,359 | 21,665 | 18,050 | 13,318 | 14,074 | 14,271 | 14,475 | 12,713 | 11,093 | 10,993 | 10,018 | 8,595 | 8,575 | $ 10,000 | ||||||||||
| Average Annual Return, Percent | 31.12% | 17.31% | 13.13% | |||||||||||||||||||||||||||||||||||||
| C000204700 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust IPOX® Europe Equity Opportunities ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 14,945 | $ 14,945 | 14,945 | 14,945 | 14,945 | $ 14,945 | 14,945 | $ 14,945 | $ 14,945 | 14,945 | 14,945 | 14,003 | 11,375 | 11,790 | 9,212 | 13,283 | 16,147 | 14,757 | 13,003 | 9,587 | 10,132 | 9,715 | $ 10,000 | |||||||||||||||||
| Average Annual Return, Percent | 31.38% | 8.08% | 6.94% | |||||||||||||||||||||||||||||||||||||
| C000205597 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Dow Jones International Internet ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 15,635 | $ 15,635 | 15,635 | 15,635 | 15,635 | $ 15,635 | $ 15,635 | $ 15,635 | 15,635 | 15,635 | 15,635 | 12,102 | 11,077 | 12,815 | 10,258 | 13,770 | 21,033 | 23,574 | 20,535 | 11,865 | 10,907 | 11,275 | $ 10,000 | |||||||||||||||||
| Average Annual Return, Percent | 41.14% | 7.47% | 7.87% | |||||||||||||||||||||||||||||||||||||
| C000234334 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Indxx Metaverse ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 12,562 | $ 12,562 | 12,562 | $ 12,562 | 12,562 | $ 12,562 | $ 12,562 | 12,562 | 12,562 | 12,562 | 12,562 | 11,780 | 9,663 | 9,755 | 7,395 | $ 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 30.01% | 9.76% | ||||||||||||||||||||||||||||||||||||||
| C000234707 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Nasdaq Lux Digital Health Solutions ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 8,341 | $ 8,341 | 8,341 | $ 8,341 | $ 8,341 | 8,341 | 8,341 | 8,341 | 8,341 | 8,341 | 8,341 | 8,254 | 6,893 | 8,415 | 6,932 | 10,210 | $ 10,000 | |||||||||||||||||||||||
| Average Annual Return, Percent | 21.01% | (6.93%) | ||||||||||||||||||||||||||||||||||||||
| C000240529 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Bloomberg Emerging Market Democracies ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | 12,430 | $ 12,430 | $ 12,430 | 12,430 | $ 12,430 | 12,430 | 12,430 | 12,430 | 12,430 | 12,430 | 12,430 | 11,686 | 10,083 | 10,141 | $ 10,000 | |||||||||||||||||||||||||
| Average Annual Return, Percent | 23.28% | 14.75% | ||||||||||||||||||||||||||||||||||||||
| C000245005 [Member] | ||||||||||||||||||||||||||||||||||||||||
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| Line Graph and Table Measure Name | First Trust Emerging Markets Human Flourishing ETF | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,200 | $ 12,200 | $ 12,200 | 12,200 | 12,200 | 12,200 | 12,200 | 12,200 | 12,200 | 12,200 | 12,200 | 11,960 | $ 10,000 | |||||||||||||||||||||||||||
| Average Annual Return, Percent | 22% | |||||||||||||||||||||||||||||||||||||||
| MSCI Europe Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI Europe Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 17,228 | $ 17,228 | 17,228 | 17,228 | 17,228 | $ 17,228 | 17,228 | $ 17,228 | 17,228 | 17,228 | $ 17,228 | 16,075 | 13,756 | 14,087 | 10,676 | 13,895 | 14,196 | 13,424 | 11,156 | 9,261 | 11,245 | 10,961 | 10,000 | 11,330 | 11,385 | 11,365 | 9,944 | 9,293 | 9,060 | 9,067 | 9,895 | 10,000 | ||||||||
| Average Annual Return, Percent | 25.23% | 8.90% | 7.54% | 5.59% | ||||||||||||||||||||||||||||||||||||
| MSCI World Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 26,114 | $ 26,114 | 26,114 | 26,114 | 26,114 | $ 26,114 | 26,114 | $ 26,114 | 26,114 | 26,114 | $ 26,114 | 23,912 | 19,717 | 19,118 | 16,167 | 20,562 | 20,117 | 18,672 | 15,616 | 12,122 | 14,144 | 13,528 | 13,891 | 12,998 | 12,488 | 11,451 | 10,569 | 9,978 | 9,491 | 10,335 | 10,000 | |||||||||
| Average Annual Return, Percent | 32.43% | 13.04% | 10.07% | |||||||||||||||||||||||||||||||||||||
| Russell 3000 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 33,432 | $ 33,432 | 33,432 | 33,432 | $ 33,432 | $ 33,432 | 33,432 | 33,432 | 33,432 | 33,432 | $ 33,432 | 30,485 | 24,724 | 23,578 | 20,524 | 25,791 | 10,000 | 24,916 | 23,043 | 18,894 | 14,178 | 16,429 | 15,601 | 15,963 | 14,344 | 13,577 | 12,604 | 11,438 | 10,676 | 9,950 | 10,713 | 10,000 | ||||||||
| Average Annual Return, Percent | 35.19% | 10.94% | 15.26% | 12.83% | ||||||||||||||||||||||||||||||||||||
| MSCI ACWI Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 24,526 | $ 24,526 | 24,526 | $ 24,526 | $ 24,526 | $ 24,526 | 24,526 | 24,526 | 24,526 | 24,526 | $ 24,526 | 22,348 | 18,613 | 18,149 | 15,409 | 10,000 | 19,607 | 19,421 | 18,277 | 15,240 | 11,822 | 13,799 | 13,321 | 13,611 | 12,974 | 12,399 | 11,305 | 10,450 | 9,827 | 9,334 | 10,273 | 10,000 | ||||||||
| Average Annual Return, Percent | 31.76% | 10.64% | 12.19% | 9.39% | ||||||||||||||||||||||||||||||||||||
| 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 | $ 35,098 | 31,787 | 25,743 | 24,472 | 21,164 | 26,524 | 25,041 | 22,935 | 19,262 | 14,669 | 16,728 | 15,769 | 16,045 | 14,402 | 13,607 | 12,633 | 11,472 | 10,782 | 9,938 | 10,000 | 10,593 | 10,000 | ||||||||
| Average Annual Return, Percent | 36.35% | 15.98% | 13.78% | 13.38% | ||||||||||||||||||||||||||||||||||||
| MSCI ACWI ex USA Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI ex USA Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 16,946 | $ 16,946 | 16,946 | 16,946 | 16,946 | $ 16,946 | $ 16,946 | 16,946 | $ 16,946 | $ 16,946 | $ 16,946 | 15,510 | 13,518 | 13,714 | 11,230 | 14,447 | 15,005 | 14,664 | 12,109 | 9,815 | 11,756 | 11,625 | 10,000 | 11,903 | 12,118 | 11,696 | 10,415 | 9,779 | 9,206 | 8,950 | 10,137 | 10,000 | ||||||||
| Average Annual Return, Percent | 25.35% | 7.59% | 7.42% | 5.47% | ||||||||||||||||||||||||||||||||||||
| MSCI Emerging Markets Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI Emerging Markets Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,511 | $ 12,511 | $ 12,511 | 12,511 | 12,511 | $ 12,511 | $ 12,511 | 12,511 | 12,511 | $ 12,511 | 12,511 | 10,930 | 10,000 | 9,925 | 10,134 | 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 30.20% | 26.05% | 15.23% | |||||||||||||||||||||||||||||||||||||
| STOXX Europe Select Dividend 30 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | STOXX® Europe Select Dividend 30 Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,369 | $ 15,369 | $ 15,369 | 15,369 | 15,369 | $ 15,369 | 15,369 | 15,369 | 15,369 | 15,369 | $ 15,369 | 14,035 | 12,704 | 12,835 | 10,313 | 13,976 | 14,320 | 14,061 | 10,128 | 9,221 | 11,894 | 11,461 | 11,608 | 11,785 | 11,484 | 10,137 | 9,617 | 9,512 | 9,211 | 9,859 | 10,000 | |||||||||
| Average Annual Return, Percent | 20.96% | 5.26% | 4.39% | |||||||||||||||||||||||||||||||||||||
| STOXX Europe 600 Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | STOXX® Europe 600 Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 17,476 | $ 17,476 | 17,476 | 17,476 | 17,476 | $ 17,476 | 17,476 | 17,476 | 17,476 | 17,476 | $ 17,476 | 16,297 | 13,908 | 14,256 | 10,797 | 14,165 | 14,597 | 13,793 | 11,477 | 9,402 | 11,369 | 11,073 | 11,460 | 11,526 | 11,494 | 10,039 | 9,396 | 9,196 | 9,193 | 9,936 | 10,000 | |||||||||
| Average Annual Return, Percent | 25.67% | 8.98% | 5.74% | |||||||||||||||||||||||||||||||||||||
| Alerian Disruptive Technology Real Estate Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Alerian Disruptive Technology Real Estate Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [1],[2] | 18.78% | ||||||||||||||||||||||||||||||||||||||
| FTSE EPRA NAREIT Developed Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | FTSE EPRA/NAREIT Developed Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 16,348 | $ 16,348 | 16,348 | 16,348 | 16,348 | $ 16,348 | 16,348 | 16,348 | 16,348 | 16,348 | $ 16,348 | 14,353 | 12,557 | 13,229 | 12,224 | 16,668 | 15,693 | 14,446 | 11,996 | 10,625 | 14,541 | 13,838 | 12,743 | 12,094 | 12,182 | 11,613 | 11,999 | 11,400 | 10,357 | 11,258 | 10,000 | |||||||||
| Average Annual Return, Percent | 30.20% | 2.37% | 5.04% | |||||||||||||||||||||||||||||||||||||
| S And P Global REIT Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Global REIT Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 16,168 | $ 16,168 | 16,168 | 16,168 | 16,168 | $ 16,168 | 16,168 | 16,168 | 16,168 | 16,168 | $ 16,168 | 14,146 | 12,397 | 13,164 | 12,151 | 16,516 | 15,283 | 13,882 | 11,612 | 10,204 | 14,262 | 13,318 | 12,393 | 11,689 | 12,049 | 11,717 | 12,172 | 11,677 | 10,411 | 11,366 | 10,000 | |||||||||
| Average Annual Return, Percent | 30.43% | 2.54% | 4.92% | |||||||||||||||||||||||||||||||||||||
| MSCI World REIT Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI World REIT Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 18,177 | $ 18,177 | 18,177 | 18,177 | 18,177 | $ 18,177 | 18,177 | 18,177 | 18,177 | 18,177 | $ 18,177 | 15,830 | 13,607 | 14,789 | 13,910 | 18,517 | 17,136 | 15,380 | 13,492 | 11,715 | 15,286 | 14,082 | 12,700 | 12,077 | 12,310 | 11,897 | 12,339 | 11,864 | 10,500 | 11,277 | 10,000 | |||||||||
| Average Annual Return, Percent | 33.56% | 3.52% | 6.16% | |||||||||||||||||||||||||||||||||||||
| MSCI World Real Estate Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Real Estate Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [2] | 31.74% | 2.74% | |||||||||||||||||||||||||||||||||||||
| Dow Jones Global Select Dividend Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones Global Select Dividend Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 16,102 | $ 16,102 | 16,102 | 16,102 | 16,102 | $ 16,102 | 16,102 | 16,102 | 16,102 | 16,102 | $ 16,102 | 14,588 | 12,872 | 13,207 | 10,865 | 14,309 | 13,741 | 13,356 | 9,285 | 8,004 | 11,031 | 10,796 | 11,399 | 11,216 | 11,139 | 10,302 | 9,710 | 9,117 | 8,516 | 9,716 | 10,000 | |||||||||
| Average Annual Return, Percent | 25.09% | 7.86% | 4.88% | |||||||||||||||||||||||||||||||||||||
| Dow Jones World Developed Markets IndexSM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones World Developed Markets IndexSM | |||||||||||||||||||||||||||||||||||||||
| Account Value | 25,950 | $ 25,950 | 25,950 | 25,950 | 25,950 | $ 25,950 | 25,950 | 25,950 | 25,950 | 25,950 | $ 25,950 | 23,865 | 19,700 | 19,141 | 16,146 | 20,587 | 20,345 | 18,991 | 15,695 | 12,144 | 14,253 | 13,677 | 14,085 | 13,244 | 12,666 | 11,578 | 10,676 | 10,043 | 9,536 | 10,382 | 10,000 | |||||||||
| Average Annual Return, Percent | 31.74% | 12.74% | 10.01% | |||||||||||||||||||||||||||||||||||||
| ISE Clean Edge Global Wind EnergyTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ISE Clean Edge Global Wind EnergyTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 21,747 | $ 21,747 | 21,747 | 21,747 | 21,747 | $ 21,747 | 21,747 | 21,747 | 21,747 | 21,747 | $ 21,747 | 18,236 | 17,096 | 20,642 | 17,390 | 22,372 | 23,453 | 24,687 | 19,050 | 13,140 | 13,949 | 13,623 | 12,862 | 13,399 | 13,180 | 12,314 | 12,289 | 10,657 | 9,324 | 9,672 | 10,000 | |||||||||
| Average Annual Return, Percent | 27.22% | 9.29% | 8.08% | |||||||||||||||||||||||||||||||||||||
| Alerian U S NextGen Infrastructure Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Alerian U.S. NextGen Infrastructure Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [3] | 36.55% | ||||||||||||||||||||||||||||||||||||||
| MSCI World Industrials Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Industrials Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 25,257 | $ 25,257 | 25,257 | 25,257 | 25,257 | $ 25,257 | 25,257 | 25,257 | 25,257 | 25,257 | $ 25,257 | 23,374 | 18,744 | 18,542 | 14,694 | 18,711 | 18,849 | 18,443 | 14,839 | 11,319 | 14,274 | 13,720 | 14,329 | 13,787 | 13,345 | 11,974 | 10,970 | 10,273 | 9,303 | 10,352 | 10,000 | |||||||||
| Average Annual Return, Percent | 34.73% | 12.09% | 9.71% | |||||||||||||||||||||||||||||||||||||
| MSCI USA Infrastructure Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI USA Infrastructure Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 21,199 | $ 21,199 | 21,199 | 21,199 | 21,199 | $ 21,199 | 21,199 | 21,199 | 21,199 | 21,199 | $ 21,199 | 17,290 | 14,695 | 16,306 | 15,024 | 17,123 | 15,468 | 15,304 | 13,794 | 12,519 | 14,984 | 13,407 | 12,521 | 11,560 | 12,018 | 11,890 | 11,427 | 10,972 | 9,572 | 10,253 | 10,000 | |||||||||
| Average Annual Return, Percent | 44.28% | 7.19% | 7.80% | |||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Industrials Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Industrials Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 31,122 | $ 31,122 | 31,122 | 31,122 | 31,122 | $ 31,122 | 31,122 | 31,122 | 31,122 | 31,122 | $ 31,122 | 28,971 | 23,066 | 22,608 | 18,340 | 22,416 | 21,243 | 21,223 | 16,224 | 12,295 | 16,026 | 15,276 | 15,903 | 14,860 | 14,202 | 12,996 | 11,548 | 10,890 | 9,642 | 10,660 | 10,000 | |||||||||
| Average Annual Return, Percent | 34.93% | 14.19% | 12.02% | |||||||||||||||||||||||||||||||||||||
| Nasdaq Clean Edge Smart Grid Infrastructure TM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq Clean Edge Smart Grid InfrastructureTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 43,267 | $ 43,267 | 43,267 | 43,267 | 43,267 | $ 43,267 | 43,267 | 43,267 | 43,267 | 43,267 | $ 43,267 | 38,654 | 31,509 | 32,316 | 24,864 | 30,652 | 29,907 | 27,485 | 19,944 | 13,491 | 15,418 | 13,369 | 14,483 | 14,859 | 14,638 | 12,363 | 11,467 | 10,036 | 9,047 | 10,183 | 10,000 | |||||||||
| Average Annual Return, Percent | 37.32% | 22.92% | 15.78% | |||||||||||||||||||||||||||||||||||||
| Indxx Global Natural Resources Income Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Indxx Global Natural Resources Income Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [4] | 13.22% | 11.18% | |||||||||||||||||||||||||||||||||||||
| MSCI ACWI Materials Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI Materials Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 19,021 | $ 19,021 | 19,021 | 19,021 | 19,021 | $ 19,021 | 19,021 | 19,021 | 19,021 | 19,021 | $ 19,021 | 17,895 | 15,756 | 16,511 | 13,493 | 18,224 | 16,554 | 16,434 | 13,054 | 9,305 | 11,685 | 11,817 | 12,276 | 12,186 | 11,734 | 10,523 | 9,481 | 8,369 | 7,644 | 9,557 | 10,000 | |||||||||
| Average Annual Return, Percent | 20.71% | 10.23% | 6.64% | |||||||||||||||||||||||||||||||||||||
| Indxx Global Agriculture Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Indxx Global Agriculture Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [5] | 4.45% | 6.34% | |||||||||||||||||||||||||||||||||||||
| Indxx 5G And NextG Thematic IndexSM [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Indxx 5G & NextG Thematic IndexSM | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [6],[7] | 32.82% | 15% | |||||||||||||||||||||||||||||||||||||
| MSCI ACWI Information Technology Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI Information Technology Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 57,502 | $ 57,502 | 57,502 | 57,502 | 57,502 | $ 57,502 | 57,502 | 57,502 | 57,502 | 57,502 | $ 57,502 | 50,989 | 38,757 | 36,322 | 28,515 | 39,261 | 38,865 | 34,973 | 29,838 | 20,367 | 20,608 | 19,087 | 19,384 | 17,574 | 15,780 | 13,598 | 12,140 | 10,885 | 9,880 | 10,678 | 10,000 | |||||||||
| Average Annual Return, Percent | 48.35% | 22.78% | 19.12% | |||||||||||||||||||||||||||||||||||||
| S Network Electric And Future Vehicle Ecosystem Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S-Network Electric & Future Vehicle Ecosystem Index | |||||||||||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [8] | 15.23% | ||||||||||||||||||||||||||||||||||||||
| ISE CTA Cloud ComputingTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ISE CTA Cloud ComputingTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 41,140 | $ 41,140 | 41,140 | 41,140 | 41,140 | $ 41,140 | 41,140 | 41,140 | 41,140 | 41,140 | $ 41,140 | 38,336 | 30,322 | 26,657 | 23,933 | 35,821 | 41,295 | 37,360 | 30,503 | 21,108 | 21,736 | 22,040 | 21,442 | 18,213 | 15,685 | 14,407 | 12,793 | 11,022 | 10,377 | 10,829 | 10,000 | |||||||||
| Average Annual Return, Percent | [9] | 35.62% | 13.61% | 15.19% | ||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Information Technology Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Information Technology Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 73,301 | $ 73,301 | 73,301 | 73,301 | 73,301 | $ 73,301 | 73,301 | 73,301 | $ 73,301 | 73,301 | $ 73,301 | 63,608 | 48,312 | 43,822 | 34,394 | 45,863 | 43,014 | 38,276 | 33,151 | 22,800 | 22,875 | 20,911 | 21,105 | 18,197 | 16,185 | 14,346 | 12,582 | 11,437 | 10,244 | 10,000 | 10,681 | $ 10,000 | ||||||||
| Average Annual Return, Percent | 51.73% | 26.22% | 23.13% | 22.04% | ||||||||||||||||||||||||||||||||||||
| IPOX International Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | IPOX® International Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 19,387 | $ 19,387 | 19,387 | 19,387 | 19,387 | $ 19,387 | 19,387 | 19,387 | $ 19,387 | $ 19,387 | $ 19,387 | 18,275 | 15,105 | 15,879 | 13,820 | 18,788 | 24,297 | 24,630 | 21,054 | 13,684 | 13,403 | 12,716 | 12,713 | 13,217 | 12,204 | 10,072 | 9,523 | 8,954 | 8,522 | $ 9,813 | $ 10,000 | |||||||||
| Average Annual Return, Percent | 28.35% | 7.66% | 6.91% | |||||||||||||||||||||||||||||||||||||
| Nasdaq CTA CybersecurityTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq CTA CybersecurityTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 33,363 | $ 33,363 | 33,363 | 33,363 | 33,363 | $ 33,363 | 33,363 | 33,363 | $ 33,363 | $ 33,363 | 33,363 | 31,588 | 25,307 | 23,633 | 21,234 | 29,091 | 26,529 | 22,591 | 18,758 | 13,794 | 14,493 | 14,642 | $ 14,808 | $ 12,943 | $ 11,276 | $ 11,137 | $ 10,113 | $ 8,645 | $ 8,585 | $ 10,000 | ||||||||||
| Average Annual Return, Percent | 31.83% | 18.15% | 13.93% | |||||||||||||||||||||||||||||||||||||
| IPOX 100 Europe Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | IPOX®-100 Europe Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 16,021 | $ 16,021 | 16,021 | 16,021 | 16,021 | $ 16,021 | 16,021 | $ 16,021 | $ 16,021 | 16,021 | 16,021 | 14,919 | 12,064 | 12,408 | 9,722 | 13,986 | 16,766 | 15,217 | 13,352 | 9,800 | 10,255 | 9,769 | $ 10,000 | |||||||||||||||||
| Average Annual Return, Percent | 32.80% | 9.33% | 8.19% | |||||||||||||||||||||||||||||||||||||
| Dow Jones International Internet Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Dow Jones International Internet Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 16,360 | $ 16,360 | 16,360 | 16,360 | 16,360 | $ 16,360 | $ 16,360 | $ 16,360 | 16,360 | 16,360 | 16,360 | 12,587 | 11,469 | 13,246 | 10,665 | 14,322 | 21,527 | 24,042 | 20,785 | 12,008 | 10,977 | 11,318 | 10,000 | |||||||||||||||||
| Average Annual Return, Percent | 42.64% | 8.31% | 8.70% | |||||||||||||||||||||||||||||||||||||
| MSCI ACWI ex USA Information Technology Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI ex-USA Information Technology Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 23,016 | $ 23,016 | 23,016 | 23,016 | 23,016 | $ 23,016 | $ 23,016 | 23,016 | 23,016 | 23,016 | 23,016 | 22,088 | 16,640 | 17,173 | 12,902 | 18,976 | $ 21,243 | $ 20,050 | $ 15,539 | $ 11,000 | $ 11,546 | $ 10,877 | $ 10,000 | |||||||||||||||||
| Average Annual Return, Percent | 38.32% | 14.79% | 15.17% | |||||||||||||||||||||||||||||||||||||
| Indxx Metaverse Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Indxx Metaverse Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 12,848 | $ 12,848 | 12,848 | $ 12,848 | 12,848 | $ 12,848 | $ 12,848 | 12,848 | 12,848 | 12,848 | 12,848 | 11,975 | 9,784 | 9,835 | 7,433 | $ 10,000 | ||||||||||||||||||||||||
| Average Annual Return, Percent | 31.31% | 10.77% | ||||||||||||||||||||||||||||||||||||||
| Nasdaq Lux Health TechTM Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq Lux Health TechTM Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 8,477 | $ 8,477 | 8,477 | $ 8,477 | $ 8,477 | 8,477 | 8,477 | 8,477 | 8,477 | 8,477 | 8,477 | 8,363 | 6,960 | 8,466 | 6,952 | 10,214 | 10,000 | |||||||||||||||||||||||
| Average Annual Return, Percent | 21.79% | (6.33%) | ||||||||||||||||||||||||||||||||||||||
| S And P Composite 1500 Health Care Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Composite 1500® Health Care Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 11,607 | $ 11,607 | 11,607 | 11,607 | $ 11,607 | 11,607 | 11,607 | 11,607 | 11,607 | 11,607 | 11,607 | 11,059 | 9,556 | 9,584 | $ 8,899 | $ 10,025 | $ 10,000 | |||||||||||||||||||||||
| Average Annual Return, Percent | 21.46% | 6.08% | ||||||||||||||||||||||||||||||||||||||
| Bloomberg Emerging Market Democracies Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Emerging Market Democracies Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | 12,860 | $ 12,860 | $ 12,860 | 12,860 | $ 12,860 | 12,860 | 12,860 | 12,860 | 12,860 | 12,860 | 12,860 | 11,921 | $ 10,211 | $ 10,143 | $ 10,000 | |||||||||||||||||||||||||
| Average Annual Return, Percent | 25.94% | 17.25% | ||||||||||||||||||||||||||||||||||||||
| Emerging Markets Human Flourishing Index [Member] | ||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Emerging Markets Human Flourishing Index | |||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,294 | $ 12,006 | $ 10,000 | |||||||||||||||||||||||||||
| Average Annual Return, Percent | 22.94% | |||||||||||||||||||||||||||||||||||||||
| [1]On September 30, 2022, the Fund’s underlying index changed from the FTSE EPRA/NAREIT Developed Index to the Alerian Disruptive Technology Real Estate Index. Therefore, the Fund’s performance and historical returns shown for periods prior to this date are not necessarily indicative of the performance the Fund, based on this current index, would have generated.[2]Performance data is not available for all the periods shown in the table for the index because performance data does not exist for some of the entire periods.[3]On July 29, 2022, the Fund’s underlying index changed from the ISE Global Engineering and Construction TM TM TM TM SM TM TM TM | ||||||||||||||||||||||||||||||||||||||||
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| C000051966 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000051966 [Member] | ABN AMRO Bank N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000051966 [Member] | HSBC Holdings PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000051966 [Member] | ING Groep N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000051966 [Member] | IG Group Holdings PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000051966 [Member] | Taylor Wimpey PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000051966 [Member] | Legal And General Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000051966 [Member] | Rio Tinto PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000051966 [Member] | NN Group N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000051966 [Member] | Tele2 AB Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000051966 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000051966 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 55.90% |
| C000051966 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000051966 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.80% |
| C000051966 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000051966 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.30% |
| C000051966 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000051966 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000051967 [Member] | Crown Castle Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000051967 [Member] | SBA Communications Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000051967 [Member] | American Tower Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000051967 [Member] | Equinix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000051967 [Member] | Prologis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000051967 [Member] | Digital Realty Trust Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000051967 [Member] | Mapletree Logistics Trust [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000051967 [Member] | First Industrial Realty Trust Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000051967 [Member] | STAG Industrial Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000051967 [Member] | Americold Realty Trust Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000051967 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000051967 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000054156 [Member] | Bankinter S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000054156 [Member] | Peyto Exploration And Development Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000054156 [Member] | British American Tobacco PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000054156 [Member] | Telia Co AB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000054156 [Member] | Hapag Lloyd AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000054156 [Member] | Fortum Oyj [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000054156 [Member] | CaixaBank S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000054156 [Member] | D S Norden A S [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000054156 [Member] | Phoenix Group Holdings PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000054156 [Member] | Altria Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000054156 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000054156 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 40.70% |
| C000054156 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000054156 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000054156 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000054156 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000054156 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000054156 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000054156 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.80% |
| C000054156 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000066484 [Member] | Orsted A S [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000066484 [Member] | EDP Renovaveis S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000066484 [Member] | Vestas Wind Systems A S [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000066484 [Member] | Northland Power Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000066484 [Member] | Bank of America Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000066484 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000066484 [Member] | China Longyuan Power Group Corp Ltd Class H [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000066484 [Member] | Boralex Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000066484 [Member] | Cadeler A S [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000066484 [Member] | Nordex SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000066484 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000066484 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000066484 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 52.30% |
| C000066484 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 34.60% |
| C000066484 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000071160 [Member] | GE Vernova Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000071160 [Member] | ThreeM Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000071160 [Member] | Builders FirstSource Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000071160 [Member] | Vistra Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000071160 [Member] | Stanley Black And Decker Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000071160 [Member] | Pentair PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000071160 [Member] | Comfort Systems USA Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000071160 [Member] | Entergy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000071160 [Member] | Masco Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000071160 [Member] | Carrier Global Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000071160 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000071160 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000071160 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.40% |
| C000071160 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 44.30% |
| C000071160 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000071160 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000071160 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000081044 [Member] | Eaton Corp PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000081044 [Member] | Johnson Controls International PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000081044 [Member] | National Grid PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000081044 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000081044 [Member] | ABB Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000081044 [Member] | Quanta Services Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000081044 [Member] | Hubbell Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000081044 [Member] | Prysmian S p A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000081044 [Member] | Aptiv PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000081044 [Member] | Samsung SDI Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000081044 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000081044 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000081044 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000081044 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000081044 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.80% |
| C000081044 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000087410 [Member] | Pentair PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000087410 [Member] | Freeport McMoRan Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000087410 [Member] | Goldman Sachs Financial Square Treasury Obligations Fund Institutional Class [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000087410 [Member] | Canadian Natural Resources Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000087410 [Member] | Agnico Eagle Mines Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000087410 [Member] | American Water Works Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000087410 [Member] | Weyerhaeuser Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000087410 [Member] | Nutrien Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000087410 [Member] | Ecopetrol S A ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000087410 [Member] | CF Industries Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000087410 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.70% |
| C000087410 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 39.60% |
| C000087410 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000087410 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000087410 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000087410 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000087410 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000087411 [Member] | Nutrien Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000087411 [Member] | CF Industries Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000087411 [Member] | Deere And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000087411 [Member] | BASF SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000087411 [Member] | Mahindra And Mahindra Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000087411 [Member] | Corteva Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000087411 [Member] | Bayer AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000087411 [Member] | Industries Qatar QSC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000087411 [Member] | Kubota Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000087411 [Member] | Wilmar International Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000087411 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 50.80% |
| C000087411 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000087411 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.30% |
| C000087411 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000087411 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000087411 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000092838 [Member] | SBA Communications Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000092838 [Member] | Goldman Sachs Financial Square Treasury Obligations Fund Institutional Class [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000092838 [Member] | Xiaomi Corp Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000092838 [Member] | Fujitsu Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000092838 [Member] | F5 Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000092838 [Member] | International Business Machines Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000092838 [Member] | Ciena Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000092838 [Member] | Infosys Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000092838 [Member] | HCL Technologies Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000092838 [Member] | Arista Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000092838 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.90% |
| C000092838 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000092838 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000092838 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000092838 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 55.70% |
| C000092838 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000101722 [Member] | Goldman Sachs Financial Square Treasury Obligations Fund Institutional Class [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000101722 [Member] | Tesla Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000101722 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000101722 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000101722 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000101722 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000101722 [Member] | Advanced Micro Devices Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000101722 [Member] | Alphabet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000101722 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000101722 [Member] | Samsung Electronics Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000101722 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000101722 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000101722 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.40% |
| C000101722 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000101722 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 50.10% |
| C000101722 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000102221 [Member] | International Business Machines Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000102221 [Member] | Arista Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000102221 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000102221 [Member] | Alphabet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000102221 [Member] | Oracle Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000102221 [Member] | Lumen Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000102221 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000102221 [Member] | Pure Storage Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000102221 [Member] | Nutanix Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000102221 [Member] | MongoDB Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000102221 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000102221 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000102221 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000102221 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000102221 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 85% |
| C000102221 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000102221 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000102221 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000146603 [Member] | ARM Holdings PLC ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000146603 [Member] | Spotify Technology S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000146603 [Member] | Monday com Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000146603 [Member] | InPost S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000146603 [Member] | Nordnet AB publ [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000146603 [Member] | NU Holdings Ltd Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000146603 [Member] | Sandoz Group AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000146603 [Member] | Aristocrat Leisure Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000146603 [Member] | UCB S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000146603 [Member] | TDK Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000146603 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000146603 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.90% |
| C000146603 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000146603 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000146603 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.10% |
| C000146603 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.80% |
| C000146603 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000146603 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24% |
| C000146603 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.30% |
| C000146603 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000159087 [Member] | Infosys Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000159087 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000159087 [Member] | Cisco Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000159087 [Member] | CrowdStrike Holdings Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000159087 [Member] | Palo Alto Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000159087 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000159087 [Member] | Booz Allen Hamilton Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000159087 [Member] | Fortinet Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000159087 [Member] | Check Point Software Technologies Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000159087 [Member] | Akamai Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000159087 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.60% |
| C000159087 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 85.40% |
| C000159087 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000204700 [Member] | ARM Holdings PLC ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000204700 [Member] | Spotify Technology S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000204700 [Member] | Monday com Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000204700 [Member] | InPost S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000204700 [Member] | Nordnet AB publ [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000204700 [Member] | UCB S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000204700 [Member] | Gen Digital Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000204700 [Member] | On Holding AG Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000204700 [Member] | BoneSupport Holding AB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000204700 [Member] | Munters Group AB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000204700 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000204700 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000204700 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000204700 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000204700 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.30% |
| C000204700 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000204700 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000204700 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000204700 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.10% |
| C000204700 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000205597 [Member] | Spotify Technology S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000205597 [Member] | Alibaba Group Holding Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000205597 [Member] | Meituan Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000205597 [Member] | Tencent Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| C000205597 [Member] | JD com Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000205597 [Member] | Prosus N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000205597 [Member] | PDD Holdings Inc ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000205597 [Member] | Shopify Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000205597 [Member] | Adyen N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000205597 [Member] | Naspers Ltd Class N [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000205597 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000205597 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.90% |
| C000205597 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 49.20% |
| C000205597 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000205597 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000205597 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000234334 [Member] | Xiaomi Corp Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000234334 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000234334 [Member] | Tencent Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000234334 [Member] | Zoom Video Communications Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000234334 [Member] | ROBLOX Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000234334 [Member] | Meta Platforms Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000234334 [Member] | Netflix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000234334 [Member] | NetEase Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000234334 [Member] | Texas Instruments Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000234334 [Member] | Take Two Interactive Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000234334 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| C000234334 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000234334 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 54% |
| C000234334 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000234334 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000234707 [Member] | Intuitive Surgical Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000234707 [Member] | ResMed Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000234707 [Member] | Veeva Systems Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000234707 [Member] | Dexcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000234707 [Member] | IQVIA Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000234707 [Member] | Insulet Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000234707 [Member] | Exact Sciences Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000234707 [Member] | Natera Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000234707 [Member] | Align Technology Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000234707 [Member] | Hologic Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000234707 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000234707 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.10% |
| C000234707 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000240529 [Member] | Samsung Electronics Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000240529 [Member] | Naspers Ltd Class N [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000240529 [Member] | FirstRand Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000240529 [Member] | Standard Bank Group Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000240529 [Member] | Grupo Mexico S A B de C V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000240529 [Member] | Capitec Bank Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000240529 [Member] | Petroleo Brasileiro S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000240529 [Member] | Powszechna Kasa Oszczednosci Bank Polski S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000240529 [Member] | America Movil S A B de C V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000240529 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.40% |
| C000240529 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000240529 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 34.90% |
| C000240529 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000240529 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000240529 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.10% |
| C000240529 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000240529 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000240529 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.40% |
| C000240529 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000240529 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000245005 [Member] | Samsung Electronics Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000245005 [Member] | FirstRand Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000245005 [Member] | Standard Bank Group Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000245005 [Member] | Petroleo Brasileiro S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000245005 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10% |
| C000245005 [Member] | Itau Unibanco Holding S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000245005 [Member] | Wal Mart de Mexico S A B de C V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000245005 [Member] | Grupo Financiero Banorte S A B de C V Class O [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000245005 [Member] | WEG S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000245005 [Member] | SM Investments Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000245005 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000245005 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36% |
| C000245005 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000245005 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000245005 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000245005 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000245005 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000245005 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.10% |
| C000245005 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000245005 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
