| Form N-CSR Cover | 12 Months Ended |
| Jul. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | First Trust Exchange-Traded Fund III |
| Entity Central Index Key | 0001424212 |
| Document Period End Date | Jul. 31, 2024 |
| Shareholder Report | 12 Months Ended | |
| Jul. 31, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | First Trust Exchange-Traded Fund III | |
| Entity Central Index Key | 0001424212 | |
| Document Period End Date | Jul. 31, 2024 | |
| C000216993 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Merger Arbitrage ETF | |
| Class Name | First Trust Merger Arbitrage ETF | |
| Trading Symbol | MARB | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Merger Arbitrage ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/MARB info ftportfolios.com | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/MARB | |
| 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 (1) Costs paid as a percentage (1) First Trust Merger Arbitrage ETF $ 1.70 % (1) Includes margin interest expense and dividend expense on investments sold short. | |
| Expenses Paid, Amount | $ 172 | [1] |
| Expense Ratio, Percent | 1.70% | [1] |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 2.26% for the 12 months ended July 31, 2024. The Fund underperformed its benchmark, the S&P Merger Arbitrage Total Return Index, which returned 9.14% for the same Period. This underperformance was driven by three negative events in the portfolio. Under normal market conditions, the Fund seeks to achieve its investment objective by establishing long and short positions in the equity securities of companies that are involved in a publicly-announced significant corporate event, such as a merger or acquisition. The primary event was the termination of the proposed merger between iRobot and Amazon in January 2024. We had seen antitrust deal risk as substantively low and manageable, but that was ultimately wrong. For the Fund, it was a disappointing outcome but one that is the risk of a merger arbitrage strategy – a deal termination. The second challenging event during the Period related to our investment in the Albertsons/Kroger merger. The Federal Trade Commission (“FTC”) filed suit to block the deal on February 26, 2024. Our thesis remains that the companies have a strong shot at defeating the FTC case, and therefore, we continue to hold the position within the Fund. Finally, April 2024 also brought an unexpected turn with the FTC suing to block Tapestry, Inc.’s acquisition of Capri Holdings. The companies intend to defend the merger through litigation, and we continue to hold the position within the Fund. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (February 4, 2020 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year Since First Trust Merger Arbitrage ETF 2.26 % 0.77 % S&P Merger Arbitrage Total Return Index (1) 9.14 % 2.97 % S&P 500 ® 22.15 % 14.00 % | |
| Performance Inception Date | Feb. 04, 2020 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Aug. 01, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/MARB | |
| Net Assets | $ 30,981,937 | |
| Holdings Count | Holding | 42 | |
| Advisory Fees Paid, Amount | $ 669,122 | |
| Investment Company Portfolio Turnover | 301% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of net assets and Fund Allocation Common Stocks 89.8 % ) Rights 0.0 % ) Money Market Funds 7.4 % ) Common Stocks Sold Short (26.7 % ) Net Other Assets and Liabilities 29.5 % ) Total 100.0 % ) Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/MARB info ftportfolios.com The Fund may have significant investments in various jurisdictions or investment sectors from time to time, making the Fund subject to the risks of such jurisdictions or investment sectors. | |
| Updated Prospectus Phone Number | 1-800-621-1675 | |
| Updated Prospectus Email Address | info@ftportfolios.com | |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/MARB | |
| C000162358 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Municipal High Income ETF | |
| Class Name | First Trust Municipal High Income ETF | |
| Trading Symbol | FMHI | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Municipal High Income ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FMHI 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/FMHI | |
| 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 Municipal High Income ETF $ 0.70 % | |
| Expenses Paid, Amount | $ 73 | |
| 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 7.77% for the 12 months ended July 31, 2024. The Fund outperformed its blended benchmark, which consists of the following two indexes: 50% of the The following key Fund factors impacted Fund performance relative to the blended benchmark during the Period: Credit Rating: Yield Curve Positioning/Duration: Interest Rate Hedge: Sector/Industry: U.S. Treasury Rate Trends: Industry Fund Flows: New Issue Supply: Municipal Credit Yields: Municipal Credit Spreads: | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (November 1, 2017 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year 5 Year Since First Trust Municipal High Income ETF 7.77 % 1.97 % 3.07 % Bloomberg Municipal Bond Index 3.74 % 1.18 % 2.01 % Blended Benchmark (1) 4.72 % 2.02 % 3.02 % (1) The Blended Benchmark consists of the following two indexes: 50% of the Bloomberg High Yield 10-Year Municipal Index (8-12 years) which is comprised of bonds with a final maturity between 8 and 12 years that are part of the Bloomberg Municipal Bond High Yield Index; and 50% of the Bloomberg Revenue 10-Year Municipal Index (8-12 years), which is comprised of revenue bonds that have a final maturity between 8 and 12 years that are part of the Bloomberg Municipal Bond Index. | |
| Performance Inception Date | Nov. 01, 2017 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FMHI | |
| Net Assets | $ 645,209,367 | |
| Holdings Count | Holding | 521 | |
| Advisory Fees Paid, Amount | $ 3,715,659 | |
| Investment Company Portfolio Turnover | 22% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Sector Allocation Special Assessment 17.5 % Industrial Development Bond 13.2 % Continuing Care Retirement Communities 11.8 % Education 9.4 % Hospital 6.3 % Government Obligation Bond - Unlimited Tax 5.0 % Gas 4.7 % Utility 4.7 % Dedicated Tax 4.2 % All Other 23.2 % Credit Quality (1) (1) The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Credit Ratings Selection [Text Block] | The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| C000187865 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust California Municipal High Income ETF | |
| Class Name | First Trust California Municipal High Income ETF | |
| Trading Symbol | FCAL | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust California Municipal High Income ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FCAL 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/FCAL | |
| 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 California Municipal High Income ETF $ 0.65 % | |
| Expenses Paid, Amount | $ 67 | |
| 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 4.62%, based on net asset value, for the 12 months ended July 31, 2024. The Fund outperformed its benchmark, the Bloomberg 10 Year California Exempt Index, which returned 1.92% for the same Period. The following key Fund factors impacted Fund performance relative to its benchmark during the Period: Credit Rating: Yield Curve Positioning/Duration: Interest Rate Hedge: Sector/Industry: U.S. Treasury Rate Trends: Industry Fund Flows: New Issue Supply: Municipal Credit Yields: Municipal Credit Spreads: | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (June 20, 2017 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year 5 Year Since First Trust California Municipal High Income ETF 4.62 % 1.26 % 2.49 % Bloomberg 10 Year California Exempt Index 1.92 % 0.95 % 1.81 % Bloomberg Municipal Bond Index 3.74 % 1.18 % 2.01 % | |
| Performance Inception Date | Jun. 20, 2017 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FCAL | |
| Net Assets | $ 253,518,578 | |
| Holdings Count | Holding | 306 | |
| Advisory Fees Paid, Amount | $ 1,252,427 | |
| Investment Company Portfolio Turnover | 41% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Sector Allocation Insured 17.4 % Special Assessment 9.3 % Airport 8.1 % Hospital 7.5 % Water & Sewer 7.5 % Government Obligation Bond - Unlimited Tax 7.4 % Certificates of Participation 7.0 % Industrial Development Bond 6.2 % Education 4.6 % All Other 25.0 % Credit Quality (1) (1) The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Credit Ratings Selection [Text Block] | The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| C000172840 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Horizon Managed Volatility Developed International ETF | |
| Class Name | First Trust Horizon Managed Volatility Developed International ETF | |
| Trading Symbol | HDMV | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Horizon Managed Volatility Developed International ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/HDMV info ftportfolios.com | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/HDMV | |
| 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 Horizon Managed Volatility Developed International ETF $ 0.80 % | |
| Expenses Paid, Amount | $ 83 | |
| Expense Ratio, Percent | 0.80% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 6.33% for the 12 months ended July 31, 2024. The Fund underperformed its benchmark, the MSCI EAFE Index, which returned 11.21% for the same Period. The Fund’s portfolio allocation process is to overweight or underweight stocks in each region based on future expected volatility of each region’s component stocks. An overweight allocation indicates that we expect that region to be relatively low risk, while an underweight allocation indicates that we expect that region to be relatively high risk. This underperformance was primarily driven by the defensive objective of the strategy capturing less of the return of the benchmark in a period of large gains for the benchmark. The Fund’s underweight to Western Europe due to volatility in those stocks detracted from performance. Denmark stocks were particularly volatile but had a strong quarter. An underweight allocation to this country resulted in a negative attribution effect. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (August 24, 2016 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year 5 Year Since First Trust Horizon Managed Volatility Developed International ETF 6.33 % 1.15 % 2.97 % MSCI EAFE Index 11.21 % 7.36 % 7.04 % | |
| Performance Inception Date | Aug. 24, 2016 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Aug. 01, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/HDMV | |
| Net Assets | $ 32,897,380 | |
| Holdings Count | Holding | 151 | |
| Advisory Fees Paid, Amount | $ 284,244 | |
| Investment Company Portfolio Turnover | 79% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings United Overseas Bank Ltd. 2.0 % Oversea-Chinese Banking Corp., Ltd. 2.0 % Singapore Exchange Ltd. 2.0 % Koninklijke KPN N.V. 2.0 % Danone S.A. 1.8 % Swisscom AG 1.7 % Zurich Insurance Group AG 1.6 % Swiss Prime Site AG 1.5 % Unilever PLC 1.5 % Deutsche Telekom AG 1.5 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings United Overseas Bank Ltd. 2.0 % Oversea-Chinese Banking Corp., Ltd. 2.0 % Singapore Exchange Ltd. 2.0 % Koninklijke KPN N.V. 2.0 % Danone S.A. 1.8 % Swisscom AG 1.7 % Zurich Insurance Group AG 1.6 % Swiss Prime Site AG 1.5 % Unilever PLC 1.5 % Deutsche Telekom AG 1.5 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/HDMV info ftportfolios.com The Fund may have significant investments in various jurisdictions or investment sectors from time to time, making the Fund subject to the risks of such jurisdictions or investment sectors. | |
| Updated Prospectus Phone Number | 1-800-621-1675 | |
| Updated Prospectus Email Address | info@ftportfolios.com | |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/HDMV | |
| C000205579 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Ultra Short Duration Municipal ETF | |
| Class Name | First Trust Ultra Short Duration Municipal ETF | |
| Trading Symbol | FUMB | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Ultra Short Duration Municipal ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FUMB info ftportfolios.com | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FUMB | |
| 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 Ultra Short Duration Municipal ETF $ 0.45 % | |
| Expenses Paid, Amount | $ 46 | |
| Expense Ratio, Percent | 0.45% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 3.37% for the 12 months ended July 31, 2024. The Fund underperformed its benchmark, the Bloomberg Municipal Short-Term Index, which returned 3.61% for the same Period. The following key Fund factors impacted the Fund’s performance relative to its benchmark during the Period: Credit Rating: Years to Maturity: Effective Duration: Sector/Industry: U.S. Treasury Rate Trends: Industry Fund Flows: New Issue Supply: Municipal Credit Yields: Municipal Credit Spreads: | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (November 1, 2018 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year 5 Year Since First Trust Ultra Short Duration Municipal ETF 3.37 % 1.41 % 1.53 % Bloomberg Municipal Short-Term Index 3.61 % 1.57 % 1.65 % Bloomberg Municipal Bond Index 3.74 % 1.18 % 2.47 % | |
| Performance Inception Date | Nov. 01, 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. | |
| Material Change Date | Aug. 01, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FUMB | |
| Net Assets | $ 199,215,632 | |
| Holdings Count | Holding | 183 | |
| Advisory Fees Paid, Amount | $ 1,023,599 | |
| Investment Company Portfolio Turnover | 112% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Sector Allocation Government Obligation Bond - Unlimited Tax 14.3 % Water & Sewer 11.4 % Insured 11.1 % Pre-refunded/Escrowed-to-maturity 10.1 % Dedicated Tax 7.1 % Industrial Development Bond 6.2 % Airport 6.0 % Hospital 5.8 % Certificates of Participation 5.4 % All Other 22.6 % Credit Quality (1) (1) The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Credit Ratings Selection [Text Block] | The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FUMB info ftportfolios.com During the fiscal year ended July 31, 2024, the Fund’s total annual operating expenses increased from 0.39% to 0.45% of average daily net assets due to the termination of a management fee waiver agreement on November 30, 2022. | |
| Material Fund Change Expenses [Text Block] | During the fiscal year ended July 31, 2024, the Fund’s total annual operating expenses increased from 0.39% to 0.45% of average daily net assets due to the termination of a management fee waiver agreement on November 30, 2022. | |
| Updated Prospectus Phone Number | 1-800-621-1675 | |
| Updated Prospectus Email Address | info@ftportfolios.com | |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/FUMB | |
| C000218390 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Horizon Managed Volatility Small/Mid ETF | |
| Class Name | First Trust Horizon Managed Volatility Small/Mid ETF | |
| Trading Symbol | HSMV | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Horizon Managed Volatility Small/Mid ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/HSMV info ftportfolios.com | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/HSMV | |
| 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 Horizon Managed Volatility Small/Mid ETF $ 0.80 % | |
| Expenses Paid, Amount | $ 86 | |
| Expense Ratio, Percent | 0.80% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 14.48% for the 12 months ended July 31, 2024. The Fund underperformed its benchmark, the S&P 1000 ® The Fund’s portfolio allocation process is to overweight or underweight stocks within each sector based on future expected volatility of each sector’s component stocks. An overweight allocation indicates that we expect that sector to be relatively low risk, while an underweight allocation indicates that we expect that sector to be relatively high risk. Small and mid-sized stocks in the U.S. generally lagged larger cap stocks over the Period as these companies have exhibited characteristics more sensitive to the higher interest rate regime. Therefore, in spite of the Fund’s more defensive profile, the lower risk nature of the selected stocks captured a majority of the return of the benchmark during a period of large gains for the benchmark. Weights in companies in the Industrials and Financials sectors had particularly high contributions to Fund returns due to their rate sensitivity. Small and mid-sized Energy stocks were strong during the Period but were not held in size due to their volatility as a result of ongoing geopolitical tensions. | |
| 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 6, 2020 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year Since First Trust Horizon Managed Volatility Small/Mid ETF 14.48 % 14.41 % S&P 1000 ® 15.08 % 21.13 % Russell 3000 ® 21.07 % 20.09 % | |
| Performance Inception Date | Apr. 06, 2020 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Aug. 01, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/HSMV | |
| Net Assets | $ 19,767,104 | |
| Holdings Count | Holding | 201 | |
| Advisory Fees Paid, Amount | $ 144,853 | |
| Investment Company Portfolio Turnover | 53% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings LXP Industrial Trust 0.7 % CommVault Systems, Inc. 0.7 % Evercore, Inc., Class A 0.7 % CubeSmart 0.7 % Plexus Corp. 0.7 % Globus Medical, Inc., Class A 0.7 % InterDigital, Inc. 0.6 % Chesapeake Utilities Corp. 0.6 % Jefferies Financial Group, Inc. 0.6 % Sprouts Farmers Market, Inc. 0.6 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings LXP Industrial Trust 0.7 % CommVault Systems, Inc. 0.7 % Evercore, Inc., Class A 0.7 % CubeSmart 0.7 % Plexus Corp. 0.7 % Globus Medical, Inc., Class A 0.7 % InterDigital, Inc. 0.6 % Chesapeake Utilities Corp. 0.6 % Jefferies Financial Group, Inc. 0.6 % Sprouts Farmers Market, Inc. 0.6 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/HSMV info ftportfolios.com The Fund may have significant investments in various jurisdictions or investment sectors from time to time, making the Fund subject to the risks of such jurisdictions or investment sectors. | |
| Updated Prospectus Phone Number | 1-800-621-1675 | |
| Updated Prospectus Email Address | info@ftportfolios.com | |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/HSMV | |
| C000172841 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Horizon Managed Volatility Domestic ETF | |
| Class Name | First Trust Horizon Managed Volatility Domestic ETF | |
| Trading Symbol | HUSV | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Horizon Managed Volatility Domestic ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/HUSV info ftportfolios.com | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/HUSV | |
| 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 Horizon Managed Volatility Domestic 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 12.74% for the 12 months ended July 31, 2024. The Fund underperformed its benchmark, the S&P 500 ® The Fund’s portfolio allocation process is to overweight or underweight stocks within each sector based on future expected volatility of each sector’s component stocks. An overweight allocation indicates that we expect that sector to be relatively low risk, while an underweight allocation indicates that we expect that sector to be relatively high risk. This underperformance was primarily driven by the defensive objective of the strategy capturing less of the return of the benchmark in a period of large gains for the benchmark. Additionally, during the Period, a concentrated subset of the largest stocks within the benchmark primarily drove returns. The Fund’s systematic strategy avoided holding these companies due to their higher volatility and the inherent risks associated with them. This resulted in underweights to some of the sectors experiencing the most gains such as the Information Technology and Communication Services sectors, and overweights to less volatile sectors such as the Consumer Staples and Industrials sectors. | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (August 24, 2016 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year 5 Year Since First Trust Horizon Managed Volatility Domestic ETF 12.74 % 8.14 % 9.49 % S&P 500 ® 22.15 % 15.00 % 14.46 % | |
| Performance Inception Date | Aug. 24, 2016 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Aug. 01, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/HUSV | |
| Net Assets | $ 87,643,635 | |
| Holdings Count | Holding | 76 | |
| Advisory Fees Paid, Amount | $ 602,266 | |
| Investment Company Portfolio Turnover | 100% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Cognizant Technology Solutions Corp., Class A 2.7 % Berkshire Hathaway, Inc., Class B 2.6 % Cisco Systems, Inc. 2.6 % Coca-Cola (The) Co. 2.5 % Colgate-Palmolive Co. 2.5 % Republic Services, Inc. 2.5 % TE Connectivity Ltd. 2.4 % PTC, Inc. 2.4 % Roper Technologies, Inc. 2.3 % Amphenol Corp., Class A 2.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Cognizant Technology Solutions Corp., Class A 2.7 % Berkshire Hathaway, Inc., Class B 2.6 % Cisco Systems, Inc. 2.6 % Coca-Cola (The) Co. 2.5 % Colgate-Palmolive Co. 2.5 % Republic Services, Inc. 2.5 % TE Connectivity Ltd. 2.4 % PTC, Inc. 2.4 % Roper Technologies, Inc. 2.3 % Amphenol Corp., Class A 2.2 % | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/HUSV info ftportfolios.com The Fund may have significant investments in various jurisdictions or investment sectors from time to time, making the Fund subject to the risks of such jurisdictions or investment sectors. | |
| Updated Prospectus Phone Number | 1-800-621-1675 | |
| Updated Prospectus Email Address | info@ftportfolios.com | |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/HUSV | |
| C000205581 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Short Duration Managed Municipal ETF | |
| Class Name | First Trust Short Duration Managed Municipal ETF | |
| Trading Symbol | FSMB | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Short Duration Managed Municipal ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FSMB info ftportfolios.com | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FSMB | |
| 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 Short Duration Managed Municipal ETF $ 0.55 % | |
| Expenses Paid, Amount | $ 56 | |
| Expense Ratio, Percent | 0.55% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 3.46% for the 12 months ended July 31, 2024. The Fund outperformed its benchmark, the Bloomberg Municipal Short (1-5) Year Index, which returned 3.34% for the same Period. The following key Fund factors impacted Fund performance relative to its benchmark during the Period: Yield Curve Positioning/Duration: Credit Rating: Sector/Industry: U.S. Treasury Rate Trends: Industry Fund Flows: New Issue Supply: Municipal Credit Yields: Municipal Credit Spreads: | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (November 1, 2018 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year 5 Year Since First Trust Short Duration Managed Municipal ETF 3.46 % 1.29 % 1.81 % Bloomberg Municipal Short (1-5) Year Index 3.34 % 1.02 % 1.62 % Bloomberg Municipal Bond Index 3.74 % 1.18 % 2.47 % | |
| Performance Inception Date | Nov. 01, 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. | |
| Material Change Date | Aug. 01, 2023 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FSMB | |
| Net Assets | $ 419,165,010 | |
| Holdings Count | Holding | 484 | |
| Advisory Fees Paid, Amount | $ 2,268,433 | |
| Investment Company Portfolio Turnover | 51% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Sector Allocation Utility 13.1 % Gas 10.5 % Hospital 10.3 % Airport 7.5 % Government Obligation Bond - Unlimited Tax 7.2 % Insured 6.6 % Industrial Development Bond 6.5 % Certificates of Participation 5.5 % Local Housing 5.1 % All Other 27.7 % Credit Quality (1) (1) The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Credit Ratings Selection [Text Block] | The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FSMB info ftportfolios.com During the fiscal year ended July 31, 2024, the Fund’s total annual operating expenses increased from 0.49% to 0.55% of average daily net assets due to the termination of a management fee waiver agreement on November 30, 2022. | |
| Material Fund Change Expenses [Text Block] | During the fiscal year ended July 31, 2024, the Fund’s total annual operating expenses increased from 0.49% to 0.55% of average daily net assets due to the termination of a management fee waiver agreement on November 30, 2022. | |
| Updated Prospectus Phone Number | 1-800-621-1675 | |
| Updated Prospectus Email Address | info@ftportfolios.com | |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/FSMB | |
| C000223991 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust New York MunicipalHigh Income ETF | |
| Class Name | First Trust New York MunicipalHigh Income ETF | |
| Trading Symbol | FMNY | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust New York Municipal High Income ETF (the “Fund”) for the year of August 1, 2023 to July 31, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FMNY info ftportfolios.com | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the Period. | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FMNY | |
| 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 New York Municipal High Income ETF $ 0.54 % | |
| Expenses Paid, Amount | $ 55 | |
| Expense Ratio, Percent | 0.54% | |
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE? The Fund returned 4.86% for the 12 months ended July 31, 2024. The Fund outperformed its benchmark, the Bloomberg Municipal New York 12-17 Year Index, which returned 4.34% for the same Period. The following key Fund factors impacted Fund performance relative to its benchmark during the Period: Credit Rating: Yield Curve Positioning/Duration: Interest Rate Hedge: Sector/Industry: U.S. Treasury Rate Trends: Industry Fund Flows: New Issue Supply: Municipal Credit Yields: Municipal Credit Spreads: | |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |
| Line Graph [Table Text Block] | FUND PERFORMANCE (May 12, 2021 to July 31, 2024) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as Investment Performance of $10,000 | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (as of July 31, 2024) 1 Year Since First Trust New York Municipal High Income ETF 4.86 % -0.77 % Bloomberg Municipal New York 12-17 Years Index 4.34 % -0.03 % Bloomberg Municipal Bond Index 3.74 % -0.38 % | |
| Performance Inception Date | May 12, 2021 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | May 12, 2024 | |
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/FMNY | |
| Net Assets | $ 18,827,311 | |
| Holdings Count | Holding | 64 | |
| Advisory Fees Paid, Amount | $ 87,152 | |
| Investment Company Portfolio Turnover | 36% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of July 31, 2024) Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of July 31, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Sector Allocation Higher Education 15.7 % Insured 10.5 % Dedicated Tax 9.7 % Government Obligation Bond - Unlimited Tax 7.9 % Industrial Development Bond 7.6 % Utility 6.7 % Toll Road 6.0 % Hospital 5.0 % Water & Sewer 4.7 % All Other 26.2 % Credit Quality (1) (1) The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Credit Ratings Selection [Text Block] | The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | |
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FMNY info ftportfolios.com Effective May 12, 2024, a management fee waiver agreement terminated, which resulted in the Fund’s total annual operating expenses increasing from 0.50% to 0.54% of average daily net assets during the fiscal year ended July 31, 2024. | |
| Material Fund Change Expenses [Text Block] | Effective May 12, 2024, a management fee waiver agreement terminated, which resulted in the Fund’s total annual operating expenses increasing from 0.50% to 0.54% of average daily net assets during the fiscal year ended July 31, 2024. | |
| Updated Prospectus Phone Number | 1-800-621-1675 | |
| Updated Prospectus Email Address | info@ftportfolios.com | |
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/FMNY | |
| [1]Includes margin interest expense and dividend expense on investments sold short. | ||
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 39 Months Ended | 52 Months Ended | 54 Months Ended | 60 Months Ended | 69 Months Ended | 81 Months Ended | 85 Months Ended | 95 Months Ended | |||||||||||||||||||||||
| Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jan. 31, 2024 | Jul. 31, 2023 | Jan. 31, 2023 | Jul. 31, 2022 | Jan. 31, 2022 | Jul. 31, 2021 | May 12, 2021 | Jan. 31, 2021 | Jul. 31, 2020 | Apr. 06, 2020 | Feb. 04, 2020 | Jan. 31, 2020 | Jul. 31, 2019 | Jan. 31, 2019 | Nov. 01, 2018 | Jul. 31, 2018 | Jan. 31, 2018 | Nov. 01, 2017 | Jul. 31, 2017 | Jun. 20, 2017 | Jan. 31, 2017 | Aug. 24, 2016 | ||
| C000216993 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Merger Arbitrage ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 10,351 | $ 10,351 | $ 10,351 | $ 10,351 | $ 10,351 | $ 10,351 | $ 10,351 | $ 10,351 | $ 10,351 | $ 10,173 | $ 10,102 | $ 10,130 | $ 10,000 | $ 9,875 | $ 9,770 | $ 9,770 | $ 9,725 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 2.26% | 0.77% | ||||||||||||||||||||||||||||||
| C000162358 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Municipal High Income ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 12,262 | 12,262 | 12,262 | $ 12,262 | $ 12,262 | 12,262 | $ 12,262 | 12,262 | 12,262 | 11,801 | 11,377 | 11,312 | 11,426 | 12,430 | 12,802 | 12,135 | 11,372 | $ 11,645 | $ 11,121 | $ 10,439 | $ 10,360 | $ 10,065 | $ 10,000 | |||||||||
| Average Annual Return, Percent | 7.77% | 1.97% | 3.07% | |||||||||||||||||||||||||||||
| C000187865 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust California Municipal High Income ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 11,915 | 11,915 | 11,915 | 11,915 | $ 11,915 | 11,915 | $ 11,915 | $ 11,915 | 11,915 | 11,751 | 11,390 | 11,394 | 11,267 | 11,916 | 12,291 | 11,982 | 11,556 | 11,683 | 11,195 | 10,509 | 10,335 | 10,203 | $ 10,050 | $ 10,000 | ||||||||
| Average Annual Return, Percent | 4.62% | 1.26% | 2.49% | |||||||||||||||||||||||||||||
| C000172840 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Horizon Managed Volatility Developed International ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 12,609 | 12,609 | 12,609 | 12,609 | $ 12,609 | 12,609 | 12,609 | $ 12,609 | $ 12,609 | 11,905 | 11,859 | 11,522 | 11,271 | 12,060 | 12,317 | 11,406 | 10,437 | 12,382 | 11,909 | 11,511 | 11,884 | 12,338 | 11,268 | $ 9,629 | $ 10,000 | |||||||
| Average Annual Return, Percent | 6.33% | 1.15% | 2.97% | |||||||||||||||||||||||||||||
| C000205579 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Ultra Short Duration Municipal ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 10,910 | 10,910 | 10,910 | 10,910 | $ 10,910 | $ 10,910 | 10,910 | 10,910 | $ 10,910 | 10,745 | 10,555 | 10,444 | 10,365 | 10,370 | 10,412 | 10,386 | 10,338 | 10,248 | 10,175 | 10,071 | $ 10,000 | |||||||||||
| Average Annual Return, Percent | 3.37% | 1.41% | 1.53% | |||||||||||||||||||||||||||||
| C000218390 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Horizon Managed Volatility Small/Mid ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 17,884 | 17,884 | $ 17,884 | 17,884 | $ 17,884 | $ 17,884 | 17,884 | 17,884 | 17,884 | 15,649 | 15,622 | 16,019 | 15,534 | 15,724 | 15,868 | 13,469 | 11,867 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 14.48% | 14.41% | ||||||||||||||||||||||||||||||
| C000172841 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Horizon Managed Volatility Domestic ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 20,528 | 20,528 | $ 20,528 | 20,528 | $ 20,528 | 20,528 | 20,528 | 20,528 | $ 20,528 | 19,065 | 18,208 | 18,049 | 18,049 | 18,382 | 17,728 | 14,788 | 14,357 | 14,798 | 13,883 | 12,245 | 12,047 | 11,987 | 11,151 | 10,201 | 10,000 | |||||||
| Average Annual Return, Percent | 12.74% | 8.14% | 9.49% | |||||||||||||||||||||||||||||
| C000205581 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust Short Duration Managed Municipal ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 11,088 | 11,088 | 11,088 | 11,088 | $ 11,088 | $ 11,088 | 11,088 | 11,088 | $ 11,088 | 10,944 | 10,717 | 10,710 | 10,669 | 10,831 | 11,021 | 10,905 | 10,708 | 10,576 | 10,398 | 10,144 | 10,000 | |||||||||||
| Average Annual Return, Percent | 3.46% | 1.29% | 1.81% | |||||||||||||||||||||||||||||
| C000223991 [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | First Trust New York Municipal High Income ETF | |||||||||||||||||||||||||||||||
| Account Value | $ 9,756 | $ 9,756 | 9,756 | 9,756 | $ 9,756 | $ 9,756 | 9,756 | 9,756 | 9,756 | 9,636 | 9,303 | 9,326 | 9,205 | 9,800 | 10,190 | $ 10,000 | ||||||||||||||||
| Average Annual Return, Percent | 4.86% | (0.77%) | ||||||||||||||||||||||||||||||
| Standard & Poor's 500 Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index | |||||||||||||||||||||||||||||||
| Account Value | $ 29,205 | $ 29,205 | 29,205 | $ 29,205 | $ 29,205 | 29,205 | 29,205 | 29,205 | $ 29,205 | 25,448 | 23,907 | 21,060 | 21,153 | 22,945 | 22,182 | 18,611 | 16,258 | 10,000 | 15,874 | 14,522 | 13,045 | 13,448 | 13,355 | 11,570 | 10,565 | 10,000 | ||||||
| Average Annual Return, Percent | 22.15% | 14% | 15% | 14.46% | ||||||||||||||||||||||||||||
| Bloomberg Municipal Bond Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||
| Account Value | $ 11,440 | $ 11,440 | 11,440 | $ 11,440 | $ 11,440 | $ 11,440 | $ 11,440 | $ 11,440 | $ 11,440 | 11,325 | 11,027 | 11,005 | 10,926 | 11,375 | 11,739 | 10,000 | 11,594 | 11,365 | 11,146 | 10,787 | 10,259 | 10,000 | 10,053 | 9,935 | 10,000 | 10,024 | 10,000 | |||||
| Average Annual Return, Percent | 3.74% | (0.38%) | 1.18% | 2.47% | 2.01% | 2.01% | ||||||||||||||||||||||||||
| MSCI EAFE Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE Index | |||||||||||||||||||||||||||||||
| Account Value | $ 17,158 | $ 17,158 | 17,158 | 17,158 | $ 17,158 | $ 17,158 | $ 17,158 | $ 17,158 | $ 17,158 | 15,915 | 15,428 | 14,467 | 13,209 | 14,888 | 15,417 | 13,910 | 11,831 | 12,769 | 12,031 | 11,389 | 12,352 | 13,019 | 11,610 | $ 10,203 | $ 10,000 | |||||||
| Average Annual Return, Percent | 11.21% | 7.36% | 7.04% | |||||||||||||||||||||||||||||
| Russell 3000 Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® Index | |||||||||||||||||||||||||||||||
| Account Value | $ 22,042 | 22,042 | $ 22,042 | 22,042 | $ 22,042 | 22,042 | 22,042 | 22,042 | $ 22,042 | 19,267 | 18,205 | 16,171 | 16,161 | 17,624 | 17,443 | 14,835 | 12,574 | 10,000 | ||||||||||||||
| Average Annual Return, Percent | 21.07% | 20.09% | ||||||||||||||||||||||||||||||
| S And P Merger Arbitrage Total Return Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P Merger Arbitrage Total Return Index | |||||||||||||||||||||||||||||||
| Account Value | $ 11,405 | 11,405 | $ 11,405 | $ 11,405 | 11,405 | 11,405 | 11,405 | 11,405 | 11,405 | 11,041 | 10,450 | 10,300 | 10,531 | 10,816 | 10,710 | 10,392 | 9,984 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | [1] | 9.14% | 2.97% | |||||||||||||||||||||||||||||
| Blended Benchmark [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Blended Benchmark | |||||||||||||||||||||||||||||||
| Account Value | [2] | $ 12,224 | 12,224 | 12,224 | $ 12,224 | $ 12,224 | 12,224 | $ 12,224 | 12,224 | 12,224 | 12,080 | 11,673 | 11,585 | 11,490 | 11,913 | 12,215 | 11,896 | 11,370 | 11,497 | 11,061 | 10,517 | 10,186 | 9,963 | $ 10,000 | ||||||||
| Average Annual Return, Percent | [2] | 4.72% | 2.02% | 3.02% | ||||||||||||||||||||||||||||
| Bloomberg 10 Year California Exempt Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg 10 Year California Exempt Index | |||||||||||||||||||||||||||||||
| Account Value | $ 11,365 | 11,365 | 11,365 | 11,365 | $ 11,365 | 11,365 | $ 11,365 | $ 11,365 | 11,365 | 11,443 | 11,150 | 11,155 | 10,964 | 11,255 | 11,672 | 11,608 | 11,470 | 11,159 | 10,840 | 10,325 | $ 10,077 | $ 9,936 | $ 10,028 | $ 10,000 | ||||||||
| Average Annual Return, Percent | 1.92% | 0.95% | 1.81% | |||||||||||||||||||||||||||||
| Bloomberg Municipal Short Term Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Short-Term Index | |||||||||||||||||||||||||||||||
| Account Value | $ 10,985 | 10,985 | 10,985 | 10,985 | $ 10,985 | $ 10,985 | 10,985 | $ 10,985 | 10,985 | 10,796 | 10,602 | 10,465 | 10,380 | 10,338 | 10,342 | 10,328 | 10,300 | 10,234 | 10,163 | 10,061 | 10,000 | |||||||||||
| Average Annual Return, Percent | 3.61% | 1.57% | 1.65% | |||||||||||||||||||||||||||||
| S And P 1000 Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 1000® Index | |||||||||||||||||||||||||||||||
| Account Value | $ 22,880 | 22,880 | $ 22,880 | 22,880 | $ 22,880 | $ 22,880 | 22,880 | 22,880 | 22,880 | 19,995 | 19,882 | 19,249 | 18,257 | 18,992 | 19,395 | 16,810 | 12,944 | $ 10,000 | ||||||||||||||
| Average Annual Return, Percent | 15.08% | 21.13% | ||||||||||||||||||||||||||||||
| Bloomberg Municipal Short 1 5 Year Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Short (1-5) Year Index | |||||||||||||||||||||||||||||||
| Account Value | $ 10,964 | 10,964 | $ 10,964 | 10,964 | $ 10,964 | $ 10,964 | 10,964 | 10,964 | 10,964 | 10,836 | 10,610 | 10,620 | 10,586 | 10,657 | 10,856 | $ 10,810 | $ 10,738 | $ 10,559 | $ 10,424 | $ 10,175 | $ 10,000 | |||||||||||
| Average Annual Return, Percent | 3.34% | 1.02% | 1.62% | |||||||||||||||||||||||||||||
| Bloomberg Municipal New York 12 17 Years Index [Member] | ||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal New York 12-17 Years Index | |||||||||||||||||||||||||||||||
| Account Value | $ 9,990 | $ 9,990 | $ 9,990 | $ 9,990 | $ 9,990 | $ 9,990 | $ 9,990 | $ 9,990 | $ 9,990 | $ 9,868 | $ 9,574 | $ 9,507 | $ 9,353 | $ 9,805 | $ 10,172 | $ 10,000 | ||||||||||||||||
| Average Annual Return, Percent | 4.34% | (0.03%) | ||||||||||||||||||||||||||||||
| [1]Effective as of August 1, 2024, the S&P Merger Arbitrage Total Return Index replaced the Credit Suisse Merger Arbitrage Liquid Index, which is no longer available for use by the Fund.[2]The Blended Benchmark consists of the following two indexes: 50% of the Bloomberg High Yield 10-Year Municipal Index (8-12 years) which is comprised of bonds with a final maturity between 8 and 12 years that are part of the Bloomberg Municipal Bond High Yield Index; and 50% of the Bloomberg Revenue 10-Year Municipal Index (8-12 years), which is comprised of revenue bonds that have a final maturity between 8 and 12 years that are part of the Bloomberg Municipal Bond Index. | ||||||||||||||||||||||||||||||||
| Shareholder Report, Holdings (Details) | Jul. 31, 2024 | |
| C000216993 [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 100% | |
| C000216993 [Member] | Long Financials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 29.30% | |
| C000216993 [Member] | Long Health care [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 27.90% | |
| C000216993 [Member] | Long Information Technology [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 23.90% | |
| C000216993 [Member] | Long Energy [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 14.30% | |
| C000216993 [Member] | Long Industrials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7% | |
| C000216993 [Member] | All Other Long [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 25.10% | |
| C000216993 [Member] | Short Financials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | (17.50%) | |
| C000216993 [Member] | Short Energy [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | (15.90%) | |
| C000216993 [Member] | All Other Short [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | (4.50%) | |
| C000216993 [Member] | Money Market Funds Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.40% | |
| C000216993 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 89.80% | |
| C000216993 [Member] | Money Market Funds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.40% | |
| C000216993 [Member] | Rights [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0% | |
| C000216993 [Member] | Common Stocks Sold Short [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (26.70%) | |
| C000216993 [Member] | Net Other Assets and Liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 29.50% | |
| C000162358 [Member] | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 38.50% | [1] |
| C000162358 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [1] |
| C000162358 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9% | [1] |
| C000162358 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.50% | [1] |
| C000162358 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 18.40% | [1] |
| C000162358 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 16.60% | [1] |
| C000162358 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.40% | [1] |
| C000162358 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 23.20% | |
| C000162358 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.70% | |
| C000162358 [Member] | Education [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.40% | |
| C000162358 [Member] | Gas [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.70% | |
| C000162358 [Member] | Special Assessment [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.50% | |
| C000162358 [Member] | Continuing Care Retirement Communities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.80% | |
| C000162358 [Member] | Hospital [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.30% | |
| C000162358 [Member] | Dedicated Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.20% | |
| C000162358 [Member] | Government Obligation Bond Unlimited Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5% | |
| C000162358 [Member] | Industrial Development Bond [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13.20% | |
| C000187865 [Member] | SP 1 MIGI short term [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [2] |
| C000187865 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [2] |
| C000187865 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 45% | [2] |
| C000187865 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 18% | [2] |
| C000187865 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.60% | [2] |
| C000187865 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.20% | [2] |
| C000187865 [Member] | NR [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 14.40% | [2] |
| C000187865 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 25% | |
| C000187865 [Member] | Education [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.60% | |
| C000187865 [Member] | Special Assessment [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | |
| C000187865 [Member] | Hospital [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.50% | |
| C000187865 [Member] | Water And Sewer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.50% | |
| C000187865 [Member] | Airport [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.10% | |
| C000187865 [Member] | Insured [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | |
| C000187865 [Member] | Government Obligation Bond Unlimited Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.40% | |
| C000187865 [Member] | Industrial Development Bond [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.20% | |
| C000187865 [Member] | Certificates of Participation [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7% | |
| C000172840 [Member] | United Overseas Bank Ltd [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2% | |
| C000172840 [Member] | Oversea Chinese Banking Corp Ltd [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2% | |
| C000172840 [Member] | Singapore Exchange Ltd [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2% | |
| C000172840 [Member] | Koninklijke KPN N V [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2% | |
| C000172840 [Member] | Danone S A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.80% | |
| C000172840 [Member] | Swisscom AG [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.70% | |
| C000172840 [Member] | Zurich Insurance Group AG [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.60% | |
| C000172840 [Member] | Swiss Prime Site AG [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.50% | |
| C000172840 [Member] | Unilever PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.50% | |
| C000172840 [Member] | Deutsche Telekom AG [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.50% | |
| C000172840 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.10% | |
| C000172840 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.60% | |
| C000172840 [Member] | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.70% | |
| C000172840 [Member] | Real Estate Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.20% | |
| C000172840 [Member] | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13.10% | |
| C000172840 [Member] | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.70% | |
| C000172840 [Member] | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.80% | |
| C000172840 [Member] | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.80% | |
| C000172840 [Member] | Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.60% | |
| C000172840 [Member] | Financials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 23.40% | |
| C000205579 [Member] | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.10% | [3] |
| C000205579 [Member] | SP 1 MIGI short term [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.70% | [3] |
| C000205579 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 24.50% | [3] |
| C000205579 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 45.30% | [3] |
| C000205579 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 14.40% | [3] |
| C000205579 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.40% | [3] |
| C000205579 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [3] |
| C000205579 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [3] |
| C000205579 [Member] | SP 1 short term [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.70% | [3] |
| C000205579 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.60% | |
| C000205579 [Member] | Hospital [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.80% | |
| C000205579 [Member] | Water And Sewer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.40% | |
| C000205579 [Member] | Airport [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6% | |
| C000205579 [Member] | Insured [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.10% | |
| C000205579 [Member] | Dedicated Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.10% | |
| C000205579 [Member] | Government Obligation Bond Unlimited Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 14.30% | |
| C000205579 [Member] | Industrial Development Bond [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.20% | |
| C000205579 [Member] | Certificates of Participation [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.40% | |
| C000205579 [Member] | Pre refunded Escrowed to maturity [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 10.10% | |
| C000218390 [Member] | LXP Industrial Trust [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | |
| C000218390 [Member] | CommVault Systems Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | |
| C000218390 [Member] | Evercore Inc Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | |
| C000218390 [Member] | CubeSmart [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | |
| C000218390 [Member] | Plexus Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | |
| C000218390 [Member] | Globus Medical Inc Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | |
| C000218390 [Member] | InterDigital Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | |
| C000218390 [Member] | Chesapeake Utilities Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | |
| C000218390 [Member] | Jefferies Financial Group Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | |
| C000218390 [Member] | Sprouts Farmers Market Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | |
| C000218390 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.70% | |
| C000218390 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.20% | |
| C000218390 [Member] | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.40% | |
| C000218390 [Member] | Real Estate Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 14.50% | |
| C000218390 [Member] | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.70% | |
| C000218390 [Member] | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.50% | |
| C000218390 [Member] | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.40% | |
| C000218390 [Member] | Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.50% | |
| C000218390 [Member] | Financials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.30% | |
| C000218390 [Member] | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.80% | |
| C000172841 [Member] | Cognizant Technology Solutions Corp Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.70% | |
| C000172841 [Member] | Berkshire Hathaway Inc Class B [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.60% | |
| C000172841 [Member] | Cisco Systems Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.60% | |
| C000172841 [Member] | Coca Cola The Co [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.50% | |
| C000172841 [Member] | Republic Services Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.50% | |
| C000172841 [Member] | TE Connectivity Ltd [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.40% | |
| C000172841 [Member] | PTC Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.40% | |
| C000172841 [Member] | Roper Technologies Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.30% | |
| C000172841 [Member] | Amphenol Corp Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.20% | |
| C000172841 [Member] | Colgate Palmolive Co [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.50% | |
| C000172841 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.40% | |
| C000172841 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.30% | |
| C000172841 [Member] | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.10% | |
| C000172841 [Member] | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3% | |
| C000172841 [Member] | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.50% | |
| C000172841 [Member] | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 16.20% | |
| C000172841 [Member] | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 16% | |
| C000172841 [Member] | Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.40% | |
| C000172841 [Member] | Financials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 16.30% | |
| C000172841 [Member] | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 20.80% | |
| C000205581 [Member] | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.60% | [4] |
| C000205581 [Member] | SP 1 MIGI short term [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.20% | [4] |
| C000205581 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 14.60% | [4] |
| C000205581 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.30% | [4] |
| C000205581 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 30.10% | [4] |
| C000205581 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.90% | [4] |
| C000205581 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [4] |
| C000205581 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [4] |
| C000205581 [Member] | SP 1 short term [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | [4] |
| C000205581 [Member] | MIG3 short term [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [4] |
| C000205581 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 27.70% | |
| C000205581 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13.10% | |
| C000205581 [Member] | Gas [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.50% | |
| C000205581 [Member] | Hospital [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.30% | |
| C000205581 [Member] | Airport [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.50% | |
| C000205581 [Member] | Insured [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.60% | |
| C000205581 [Member] | Local Housing [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.10% | |
| C000205581 [Member] | Government Obligation Bond Unlimited Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.20% | |
| C000205581 [Member] | Industrial Development Bond [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.50% | |
| C000205581 [Member] | Certificates of Participation [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.50% | |
| C000223991 [Member] | Not Rated [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.70% | [5] |
| C000223991 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.50% | [5] |
| C000223991 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 45.50% | [5] |
| C000223991 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 19.40% | [5] |
| C000223991 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 14.10% | [5] |
| C000223991 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3.40% | [5] |
| C000223991 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.40% | [5] |
| C000223991 [Member] | Unclassified Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 26.20% | |
| C000223991 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6.70% | |
| C000223991 [Member] | Hospital [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5% | |
| C000223991 [Member] | Water And Sewer [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.70% | |
| C000223991 [Member] | Insured [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.50% | |
| C000223991 [Member] | Higher Education [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.70% | |
| C000223991 [Member] | Toll Road [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 6% | |
| C000223991 [Member] | Dedicated Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.70% | |
| C000223991 [Member] | Government Obligation Bond Unlimited Tax [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.90% | |
| C000223991 [Member] | Industrial Development Bond [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.60% | |
| [1]The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.[2]The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.[3]The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.[4]The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.[5]The credit quality and ratings information presented above reflect the ratings assigned by one or more nationally recognized statistical rating organizations (NRSROs), including S&P Global Ratings, Moody’s Investors Service, Inc., Fitch Ratings or a comparably rated NRSRO. For situations in which a security is rated by more than one NRSRO and the ratings are not equivalent, the highest rating is used. Sub-investment grade ratings are those rated BB+/Ba1 or lower. Investment grade ratings are those rated BBB-/Baa3 or higher. The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change. | ||
