| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | First Trust Exchange-Traded Fund |
| Entity Central Index Key | 0001329377 |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Jun. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | First Trust Exchange-Traded Fund | |
| Entity Central Index Key | 0001329377 | |
| Document Period End Date | Jun. 30, 2024 | |
| C000030351 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust US Equity Opportunities ETF | |
| Class Name | First Trust US Equity Opportunities ETF | |
| Trading Symbol | FPX | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust US Equity Opportunities ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FPX | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FPX | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust US Equity Opportunities ETF $ 0.55 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 28 | |
| Expense Ratio, Percent | 0.55% | [1] |
| Net Assets | $ 700,546,055 | |
| Holdings Count | Holding | 103 | |
| Investment Company Portfolio Turnover | 40% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Regeneron Pharmaceuticals, Inc. 9.2 % Carrier Global Corp. 6.8 % Airbnb, Inc., Class A 6.2 % Samsara, Inc., Class A 4.8 % Otis Worldwide Corp. 3.5 % Constellation Energy Corp. 3.1 % Palantir Technologies, Inc., Class A 2.8 % Crowdstrike Holdings, Inc., Class A 2.8 % DraftKings, Inc., Class A 2.6 % DoorDash, Inc., Class A 2.6 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Regeneron Pharmaceuticals, Inc. 9.2 % Carrier Global Corp. 6.8 % Airbnb, Inc., Class A 6.2 % Samsara, Inc., Class A 4.8 % Otis Worldwide Corp. 3.5 % Constellation Energy Corp. 3.1 % Palantir Technologies, Inc., Class A 2.8 % Crowdstrike Holdings, Inc., Class A 2.8 % DraftKings, Inc., Class A 2.6 % DoorDash, Inc., Class A 2.6 % | |
| C000030350 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Morningstar Dividend Leaders Index Fund | |
| Class Name | First Trust Morningstar Dividend Leaders Index Fund | |
| Trading Symbol | FDL | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Morningstar Dividend Leaders Index Fund (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FDL | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FDL | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Morningstar Dividend Leaders Index Fund $ 0.43 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 22 | |
| Expense Ratio, Percent | 0.43% | [2] |
| Net Assets | $ 3,870,824,700 | |
| Holdings Count | Holding | 101 | |
| Investment Company Portfolio Turnover | 35% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Chevron Corp. 8.8 % Verizon Communications, Inc. 8.3 % AbbVie, Inc. 8.1 % Pfizer, Inc. 6.9 % Philip Morris International, Inc. 5.7 % Altria Group, Inc. 4.8 % International Business Machines Corp. 4.5 % United Parcel Service, Inc., Class B 3.4 % Gilead Sciences, Inc. 2.9 % CVS Health Corp. 2.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Chevron Corp. 8.8 % Verizon Communications, Inc. 8.3 % AbbVie, Inc. 8.1 % Pfizer, Inc. 6.9 % Philip Morris International, Inc. 5.7 % Altria Group, Inc. 4.8 % International Business Machines Corp. 4.5 % United Parcel Service, Inc., Class B 3.4 % Gilead Sciences, Inc. 2.9 % CVS Health Corp. 2.4 % | |
| C000238354 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Growth StrengthTM ETF | |
| Class Name | First Trust Growth StrengthTM ETF | |
| Trading Symbol | FTGS | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Growth Strength TM | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTGS | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FTGS | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Growth Strength TM $ 0.60 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 32 | |
| Expense Ratio, Percent | 0.60% | [3] |
| Net Assets | $ 481,245,598 | |
| Holdings Count | Holding | 51 | |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings NVIDIA Corp. 3.0 % Arista Networks, Inc. 2.7 % Monolithic Power Systems, Inc. 2.6 % Tesla, Inc. 2.5 % Broadcom, Inc. 2.5 % KLA Corp. 2.5 % Applied Materials, Inc. 2.3 % Amphenol Corp., Class A 2.3 % Palo Alto Networks, Inc. 2.3 % Deckers Outdoor Corp. 2.3 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 3.0 % Arista Networks, Inc. 2.7 % Monolithic Power Systems, Inc. 2.6 % Tesla, Inc. 2.5 % Broadcom, Inc. 2.5 % KLA Corp. 2.5 % Applied Materials, Inc. 2.3 % Amphenol Corp., Class A 2.3 % Palo Alto Networks, Inc. 2.3 % Deckers Outdoor Corp. 2.3 % | |
| C000030478 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NASDAQ-100-Technology Sector Index Fund | |
| Class Name | First Trust NASDAQ-100-Technology Sector Index Fund | |
| Trading Symbol | QTEC | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust NASDAQ-100-Technology Sector Index Fund (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/QTEC | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/QTEC | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ-100-Technology Sector Index Fund $ 0.54 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 29 | |
| Expense Ratio, Percent | 0.54% | [4] |
| Net Assets | $ 4,108,891,022 | |
| Holdings Count | Holding | 44 | |
| Investment Company Portfolio Turnover | 11% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Datadog, Inc., Class A 2.6 % MongoDB, Inc. 2.6 % Atlassian Corp., Class A 2.6 % Zscaler, Inc. 2.6 % Palo Alto Networks, Inc. 2.5 % Adobe, Inc. 2.5 % Intuit, Inc. 2.5 % Fortinet, Inc. 2.5 % Autodesk, Inc. 2.4 % ARM Holdings PLC, ADR 2.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Datadog, Inc., Class A 2.6 % MongoDB, Inc. 2.6 % Atlassian Corp., Class A 2.6 % Zscaler, Inc. 2.6 % Palo Alto Networks, Inc. 2.5 % Adobe, Inc. 2.5 % Intuit, Inc. 2.5 % Fortinet, Inc. 2.5 % Autodesk, Inc. 2.4 % ARM Holdings PLC, ADR 2.4 % | |
| C000034137 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Capital Strength® ETF | |
| Class Name | First Trust Capital Strength® ETF | |
| Trading Symbol | FTCS | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Capital Strength ® | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTCS | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FTCS | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Capital Strength ® $ 0.52 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 27 | |
| Expense Ratio, Percent | 0.52% | [5] |
| Net Assets | $ 8,576,789,996 | |
| Holdings Count | Holding | 50 | |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Apple, Inc. 2.5 % Amphenol Corp., Class A 2.4 % Costco Wholesale Corp. 2.3 % TJX (The) Cos., Inc. 2.3 % Regeneron Pharmaceuticals, Inc. 2.3 % Walmart, Inc. 2.2 % Motorola Solutions, Inc. 2.2 % Moody’s Corp. 2.2 % Microsoft Corp. 2.2 % Colgate-Palmolive Co. 2.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Apple, Inc. 2.5 % Amphenol Corp., Class A 2.4 % Costco Wholesale Corp. 2.3 % TJX (The) Cos., Inc. 2.3 % Regeneron Pharmaceuticals, Inc. 2.3 % Walmart, Inc. 2.2 % Motorola Solutions, Inc. 2.2 % Moody’s Corp. 2.2 % Microsoft Corp. 2.2 % Colgate-Palmolive Co. 2.2 % | |
| C000037913 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Value Line® Dividend Index Fund | |
| Class Name | First Trust Value Line® Dividend Index Fund | |
| Trading Symbol | FVD | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Value Line ® | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FVD | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FVD | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Value Line ® $ 0.61 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 31 | |
| Expense Ratio, Percent | 0.61% | [6] |
| Net Assets | $ 9,202,015,806 | |
| Holdings Count | Holding | 204 | |
| Investment Company Portfolio Turnover | 47% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings ONE Gas, Inc. 0.5 % UnitedHealth Group, Inc. 0.5 % Houlihan Lokey, Inc. 0.5 % Commerce Bancshares, Inc. 0.5 % Toyota Motor Corp., ADR 0.5 % Infosys Ltd., ADR 0.5 % Tootsie Roll Industries, Inc. 0.5 % Juniper Networks, Inc. 0.5 % McCormick & Co., Inc. 0.5 % AT&T, Inc. 0.5 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings ONE Gas, Inc. 0.5 % UnitedHealth Group, Inc. 0.5 % Houlihan Lokey, Inc. 0.5 % Commerce Bancshares, Inc. 0.5 % Toyota Motor Corp., ADR 0.5 % Infosys Ltd., ADR 0.5 % Tootsie Roll Industries, Inc. 0.5 % Juniper Networks, Inc. 0.5 % McCormick & Co., Inc. 0.5 % AT&T, Inc. 0.5 % | |
| C000201408 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Lunt U.S. Factor Rotation ETF | |
| Class Name | First Trust Lunt U.S. Factor Rotation ETF | |
| Trading Symbol | FCTR | |
| Security Exchange Name | CboeBZX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Lunt U.S. Factor Rotation ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FCTR | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FCTR | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Lunt U.S. Factor Rotation ETF $ 0.65 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 34 | |
| Expense Ratio, Percent | 0.65% | [7] |
| Net Assets | $ 71,394,353 | |
| Holdings Count | Holding | 171 | |
| Investment Company Portfolio Turnover | 220% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Vertiv Holdings Co., Class A 2.1 % NVIDIA Corp. 1.6 % Coinbase Global, Inc., Class A 1.6 % Vistra Corp. 1.5 % Paychex, Inc. 1.4 % Illinois Tool Works, Inc. 1.3 % Brown & Brown, Inc. 1.3 % Colgate-Palmolive Co. 1.3 % Sysco Corp. 1.2 % Procter & Gamble (The) Co. 1.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Vertiv Holdings Co., Class A 2.1 % NVIDIA Corp. 1.6 % Coinbase Global, Inc., Class A 1.6 % Vistra Corp. 1.5 % Paychex, Inc. 1.4 % Illinois Tool Works, Inc. 1.3 % Brown & Brown, Inc. 1.3 % Colgate-Palmolive Co. 1.3 % Sysco Corp. 1.2 % Procter & Gamble (The) Co. 1.2 % | |
| C000238091 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Indxx Aerospace & Defense ETF | |
| Class Name | First Trust Indxx Aerospace & Defense ETF | |
| Trading Symbol | MISL | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Indxx Aerospace & Defense ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/MISL | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/MISL | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Indxx Aerospace & Defense ETF $ 0.60 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 31 | |
| Expense Ratio, Percent | 0.60% | [8] |
| Net Assets | $ 65,831,675 | |
| Holdings Count | Holding | 35 | |
| Investment Company Portfolio Turnover | 10% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Boeing (The) Co. 8.1 % TransDigm Group, Inc. 7.9 % Lockheed Martin Corp. 7.8 % General Dynamics Corp. 7.6 % RTX Corp. 7.6 % Howmet Aerospace, Inc. 4.6 % HEICO Corp. 4.4 % Leidos Holdings, Inc. 4.4 % L3Harris Technologies, Inc. 4.2 % Woodward, Inc. 3.6 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Boeing (The) Co. 8.1 % TransDigm Group, Inc. 7.9 % Lockheed Martin Corp. 7.8 % General Dynamics Corp. 7.6 % RTX Corp. 7.6 % Howmet Aerospace, Inc. 4.6 % HEICO Corp. 4.4 % Leidos Holdings, Inc. 4.4 % L3Harris Technologies, Inc. 4.2 % Woodward, Inc. 3.6 % | |
| C000244355 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust S&P 500 Diversified Free Cash Flow ETF | |
| Class Name | First Trust S&P 500 Diversified Free Cash Flow ETF | |
| Trading Symbol | FCFY | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust S&P 500 Diversified Free Cash Flow ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FCFY | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FCFY | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust S&P 500 Diversified Free Cash Flow ETF $ 0.60 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 30 | |
| Expense Ratio, Percent | 0.60% | [9] |
| Net Assets | $ 1,129,211 | |
| Holdings Count | Holding | 101 | |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings HP, Inc. 3.7 % Skyworks Solutions, Inc. 3.6 % Hewlett Packard Enterprise Co. 3.5 % Warner Bros. Discovery, Inc. 2.6 % Cisco Systems, Inc. 2.6 % AT&T, Inc. 2.5 % NetApp, Inc. 2.4 % Synchrony Financial 2.3 % QUALCOMM, Inc. 2.1 % Electronic Arts, Inc. 2.1 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings HP, Inc. 3.7 % Skyworks Solutions, Inc. 3.6 % Hewlett Packard Enterprise Co. 3.5 % Warner Bros. Discovery, Inc. 2.6 % Cisco Systems, Inc. 2.6 % AT&T, Inc. 2.5 % NetApp, Inc. 2.4 % Synchrony Financial 2.3 % QUALCOMM, Inc. 2.1 % Electronic Arts, Inc. 2.1 % | |
| C000047627 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Natural Gas ETF | |
| Class Name | First Trust Natural Gas ETF | |
| Trading Symbol | FCG | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Natural Gas ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FCG | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FCG | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Natural Gas ETF $ 0.58 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 30 | |
| Expense Ratio, Percent | 0.58% | [10] |
| Net Assets | $ 410,826,364 | |
| Holdings Count | Holding | 45 | |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Western Midstream Partners, L.P. 5.0 % Hess Midstream, L.P., Class A 4.9 % EOG Resources, Inc. 4.4 % ConocoPhillips 4.4 % Occidental Petroleum Corp. 4.3 % Diamondback Energy, Inc. 4.2 % Devon Energy Corp. 3.9 % APA Corp. 3.6 % Coterra Energy, Inc. 3.6 % EQT Corp. 3.5 % Sub-Industry Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Western Midstream Partners, L.P. 5.0 % Hess Midstream, L.P., Class A 4.9 % EOG Resources, Inc. 4.4 % ConocoPhillips 4.4 % Occidental Petroleum Corp. 4.3 % Diamondback Energy, Inc. 4.2 % Devon Energy Corp. 3.9 % APA Corp. 3.6 % Coterra Energy, Inc. 3.6 % EQT Corp. 3.5 % | |
| C000191287 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dow 30 Equal Weight ETF | |
| Class Name | First Trust Dow 30 Equal Weight ETF | |
| Trading Symbol | EDOW | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Dow 30 Equal Weight ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/EDOW | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/EDOW | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow 30 Equal Weight ETF $ 0.50 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 25 | |
| Expense Ratio, Percent | 0.50% | [11] |
| Net Assets | $ 227,943,952 | |
| Holdings Count | Holding | 31 | |
| Investment Company Portfolio Turnover | 12% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Salesforce, Inc. 3.7 % Amazon.com, Inc. 3.5 % Amgen, Inc. 3.5 % JPMorgan Chase & Co. 3.4 % Cisco Systems, Inc. 3.4 % Verizon Communications, Inc. 3.4 % Caterpillar, Inc. 3.4 % American Express Co. 3.4 % Boeing (The) Co. 3.4 % Chevron Corp. 3.4 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings Salesforce, Inc. 3.7 % Amazon.com, Inc. 3.5 % Amgen, Inc. 3.5 % JPMorgan Chase & Co. 3.4 % Cisco Systems, Inc. 3.4 % Verizon Communications, Inc. 3.4 % Caterpillar, Inc. 3.4 % American Express Co. 3.4 % Boeing (The) Co. 3.4 % Chevron Corp. 3.4 % | |
| C000222997 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | FT Vest Gold Strategy Quarterly Buffer ETF | |
| Class Name | FT Vest Gold Strategy Quarterly Buffer ETF | |
| Trading Symbol | BGLD | |
| Security Exchange Name | CboeBZX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the FT Vest Gold Strategy Quarterly Buffer ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/BGLD | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/BGLD | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage FT Vest Gold Strategy Quarterly Buffer ETF $ 0.90 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 47 | |
| Expense Ratio, Percent | 0.90% | [12] |
| Net Assets | $ 29,421,473 | |
| Holdings Count | Holding | 5 | |
| Investment Company Portfolio Turnover | 0% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund. Fund Allocation U.S. Treasury Bills 93.8 % Money Market Funds 0.6 % Purchased Options 6.0 % Written Options (0.4%) Net Other Assets and Liabilities 0.0 % Total 100.0 % Any amount shown as 0.0% represents less than 0.1%. | |
| C000241319 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Bloomberg Inflation Sensitive Equity ETF | |
| Class Name | First Trust Bloomberg Inflation Sensitive Equity ETF | |
| Trading Symbol | FTIF | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Bloomberg Inflation Sensitive Equity ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTIF | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FTIF | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Bloomberg Inflation Sensitive Equity ETF $ 0.60 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 31 | |
| Expense Ratio, Percent | 0.60% | [13] |
| Net Assets | $ 2,274,329 | |
| Holdings Count | Holding | 51 | |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Carlisle Cos., Inc. 2.5 % Diamondback Energy, Inc. 2.5 % Weatherford International PLC 2.4 % Westinghouse Air Brake Technologies Corp. 2.4 % Valero Energy Corp. 2.3 % Permian Resources Corp. 2.3 % Marathon Oil Corp. 2.3 % Dover Corp. 2.3 % Cummins, Inc. 2.2 % Advanced Drainage Systems, Inc. 2.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Carlisle Cos., Inc. 2.5 % Diamondback Energy, Inc. 2.5 % Weatherford International PLC 2.4 % Westinghouse Air Brake Technologies Corp. 2.4 % Valero Energy Corp. 2.3 % Permian Resources Corp. 2.3 % Marathon Oil Corp. 2.3 % Dover Corp. 2.3 % Cummins, Inc. 2.2 % Advanced Drainage Systems, Inc. 2.2 % | |
| C000029773 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dow Jones Select MicroCap Index Fund | |
| Class Name | First Trust Dow Jones Select MicroCap Index Fund | |
| Trading Symbol | FDM | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Dow Jones Select MicroCap Index Fund (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FDM | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FDM | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow Jones Select MicroCap Index Fund $ 0.60 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 30 | |
| Expense Ratio, Percent | 0.60% | [14] |
| Net Assets | $ 171,479,044 | |
| Holdings Count | Holding | 158 | |
| Investment Company Portfolio Turnover | 5% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings VSE Corp. 2.3 % Powell Industries, Inc. 2.2 % Crescent Energy, Inc., Class A 2.0 % CRA International, Inc. 2.0 % ACM Research, Inc., Class A 1.8 % ScanSource, Inc. 1.8 % Genco Shipping & Trading Ltd. 1.5 % Barrett Business Services, Inc. 1.4 % CECO Environmental Corp. 1.4 % Cullinan Therapeutics, Inc. 1.4 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings VSE Corp. 2.3 % Powell Industries, Inc. 2.2 % Crescent Energy, Inc., Class A 2.0 % CRA International, Inc. 2.0 % ACM Research, Inc., Class A 1.8 % ScanSource, Inc. 1.8 % Genco Shipping & Trading Ltd. 1.5 % Barrett Business Services, Inc. 1.4 % CECO Environmental Corp. 1.4 % Cullinan Therapeutics, Inc. 1.4 % | |
| C000030477 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NASDAQ-100 Equal Weighted Index Fund | |
| Class Name | First Trust NASDAQ-100 Equal Weighted Index Fund | |
| Trading Symbol | QQEW | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust NASDAQ-100 Equal Weighted Index Fund (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/QQEW | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/QQEW | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ-100 Equal Weighted Index Fund $ 0.55 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 28 | |
| Expense Ratio, Percent | 0.55% | [15] |
| Net Assets | $ 2,065,092,870 | |
| Holdings Count | Holding | 104 | |
| Investment Company Portfolio Turnover | 9% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Datadog, Inc., Class A 1.1 % MongoDB, Inc. 1.1 % Atlassian Corp., Class A 1.1 % Tesla, Inc. 1.1 % Zscaler, Inc. 1.1 % Baker Hughes Co. 1.1 % Palo Alto Networks, Inc. 1.1 % Diamondback Energy, Inc. 1.0 % Adobe, Inc. 1.0 % Intuit, Inc. 1.0 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Datadog, Inc., Class A 1.1 % MongoDB, Inc. 1.1 % Atlassian Corp., Class A 1.1 % Tesla, Inc. 1.1 % Zscaler, Inc. 1.1 % Baker Hughes Co. 1.1 % Palo Alto Networks, Inc. 1.1 % Diamondback Energy, Inc. 1.0 % Adobe, Inc. 1.0 % Intuit, Inc. 1.0 % | |
| C000033930 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dow Jones Internet Index Fund | |
| Class Name | First Trust Dow Jones Internet Index Fund | |
| Trading Symbol | FDN | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Dow Jones Internet Index Fund (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FDN | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FDN | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dow Jones Internet Index Fund $ 0.49 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 26 | |
| Expense Ratio, Percent | 0.49% | [16] |
| Net Assets | $ 6,023,664,877 | |
| Holdings Count | Holding | 43 | |
| Investment Company Portfolio Turnover | 20% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Amazon.com, Inc. 10.1 % Meta Platforms, Inc., Class A 9.4 % Netflix, Inc. 6.5 % Alphabet, Inc., Class A 5.2 % Salesforce, Inc. 5.1 % Arista Networks, Inc. 4.9 % Cisco Systems, Inc. 4.5 % Booking Holdings, Inc. 4.5 % Airbnb, Inc., Class A 4.4 % Alphabet, Inc., Class C 4.3 % Sector Allocation Any amount shown as 0.0% represents less than 0.1%. | |
| Largest Holdings [Text Block] | Top Ten Holdings Amazon.com, Inc. 10.1 % Meta Platforms, Inc., Class A 9.4 % Netflix, Inc. 6.5 % Alphabet, Inc., Class A 5.2 % Salesforce, Inc. 5.1 % Arista Networks, Inc. 4.9 % Cisco Systems, Inc. 4.5 % Booking Holdings, Inc. 4.5 % Airbnb, Inc., Class A 4.4 % Alphabet, Inc., Class C 4.3 % | |
| C000033929 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NYSE® Arca® Biotechnology Index Fund | |
| Class Name | First Trust NYSE® Arca® Biotechnology Index Fund | |
| Trading Symbol | FBT | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust NYSE ® ® | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FBT | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FBT | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NYSE ® ® $ 0.53 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 26 | |
| Expense Ratio, Percent | 0.53% | [17] |
| Net Assets | $ 1,108,229,996 | |
| Holdings Count | Holding | 31 | |
| Investment Company Portfolio Turnover | 52% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Alnylam Pharmaceuticals, Inc. 5.2 % Corcept Therapeutics, Inc. 4.4 % United Therapeutics Corp. 4.3 % Halozyme Therapeutics, Inc. 4.3 % Vertex Pharmaceuticals, Inc. 3.8 % Biogen, Inc. 3.7 % Amgen, Inc. 3.7 % Regeneron Pharmaceuticals, Inc. 3.7 % Natera, Inc. 3.6 % Argenx SE, ADR 3.6 % Industry Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Alnylam Pharmaceuticals, Inc. 5.2 % Corcept Therapeutics, Inc. 4.4 % United Therapeutics Corp. 4.3 % Halozyme Therapeutics, Inc. 4.3 % Vertex Pharmaceuticals, Inc. 3.8 % Biogen, Inc. 3.7 % Amgen, Inc. 3.7 % Regeneron Pharmaceuticals, Inc. 3.7 % Natera, Inc. 3.6 % Argenx SE, ADR 3.6 % | |
| C000035622 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NASDAQ-100 Ex-Technology Sector Index Fund | |
| Class Name | First Trust NASDAQ-100 Ex-Technology Sector Index Fund | |
| Trading Symbol | QQXT | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust NASDAQ-100 Ex-Technology Sector Index Fund (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/QQXT | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/QQXT | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ-100 Ex-Technology Sector Index Fund $ 0.60 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 30 | |
| Expense Ratio, Percent | 0.60% | [18] |
| Net Assets | $ 132,129,950 | |
| Holdings Count | Holding | 62 | |
| Investment Company Portfolio Turnover | 12% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Tesla, Inc. 1.8 % Baker Hughes Co. 1.8 % Diamondback Energy, Inc. 1.8 % Warner Bros. Discovery, Inc. 1.8 % Biogen, Inc. 1.8 % Charter Communications, Inc., Class A 1.8 % Intuitive Surgical, Inc. 1.8 % MercadoLibre, Inc. 1.8 % Amazon.com, Inc. 1.7 % Comcast Corp., Class A 1.7 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Tesla, Inc. 1.8 % Baker Hughes Co. 1.8 % Diamondback Energy, Inc. 1.8 % Warner Bros. Discovery, Inc. 1.8 % Biogen, Inc. 1.8 % Charter Communications, Inc., Class A 1.8 % Intuitive Surgical, Inc. 1.8 % MercadoLibre, Inc. 1.8 % Amazon.com, Inc. 1.7 % Comcast Corp., Class A 1.7 % | |
| C000041643 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NASDAQ® Clean Edge® Green Energy Index Fund | |
| Class Name | First Trust NASDAQ® Clean Edge® Green Energy Index Fund | |
| Trading Symbol | QCLN | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust NASDAQ ® ® | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/QCLN | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/QCLN | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ ® ® $ 0.56 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 25 | |
| Expense Ratio, Percent | 0.56% | [19] |
| Net Assets | $ 692,976,171 | |
| Holdings Count | Holding | 58 | |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 10.2 % Tesla, Inc. 8.8 % ON Semiconductor Corp. 7.4 % First Solar, Inc. 6.6 % Enphase Energy, Inc. 6.1 % Albemarle Corp. 5.0 % Rivian Automotive, Inc., Class A 4.9 % Universal Display Corp. 4.5 % Acuity Brands, Inc. 3.4 % Brookfield Renewable Partners, L.P. 3.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Goldman Sachs Financial Square Treasury Obligations Fund - Institutional Class 10.2 % Tesla, Inc. 8.8 % ON Semiconductor Corp. 7.4 % First Solar, Inc. 6.6 % Enphase Energy, Inc. 6.1 % Albemarle Corp. 5.0 % Rivian Automotive, Inc., Class A 4.9 % Universal Display Corp. 4.5 % Acuity Brands, Inc. 3.4 % Brookfield Renewable Partners, L.P. 3.2 % | |
| C000047628 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Water ETF | |
| Class Name | First Trust Water ETF | |
| Trading Symbol | FIW | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Water ETF (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FIW | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FIW | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Water ETF $ 0.51 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 26 | |
| Expense Ratio, Percent | 0.51% | [20] |
| Net Assets | $ 1,667,565,465 | |
| Holdings Count | Holding | 39 | |
| Investment Company Portfolio Turnover | 10% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Veralto Corp. 4.2 % American Water Works Co., Inc. 4.2 % Xylem, Inc. 4.1 % Ecolab, Inc. 4.1 % Roper Technologies, Inc. 4.0 % Agilent Technologies, Inc. 3.6 % Essential Utilities, Inc. 3.6 % Ferguson PLC 3.5 % AECOM 3.3 % Tetra Tech, Inc. 3.3 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Veralto Corp. 4.2 % American Water Works Co., Inc. 4.2 % Xylem, Inc. 4.1 % Ecolab, Inc. 4.1 % Roper Technologies, Inc. 4.0 % Agilent Technologies, Inc. 3.6 % Essential Utilities, Inc. 3.6 % Ferguson PLC 3.5 % AECOM 3.3 % Tetra Tech, Inc. 3.3 % | |
| C000037851 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust Dividend StrengthTM ETF | |
| Class Name | First Trust Dividend StrengthTM ETF | |
| Trading Symbol | FTDS | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust Dividend Strength TM | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTDS | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FTDS | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust Dividend Strength TM $ 0.70 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 36 | |
| Expense Ratio, Percent | 0.70% | [21] |
| Net Assets | $ 21,808,115 | |
| Holdings Count | Holding | 51 | |
| Investment Company Portfolio Turnover | 57% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings QUALCOMM, Inc. 2.5 % Garmin Ltd. 2.3 % Synovus Financial Corp. 2.3 % Microchip Technology, Inc. 2.2 % Equitable Holdings, Inc. 2.2 % Stifel Financial Corp. 2.2 % Skyworks Solutions, Inc. 2.2 % Dick’s Sporting Goods, Inc. 2.2 % Honeywell International, Inc. 2.2 % Zions Bancorp N.A. 2.2 % Sector Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings QUALCOMM, Inc. 2.5 % Garmin Ltd. 2.3 % Synovus Financial Corp. 2.3 % Microchip Technology, Inc. 2.2 % Equitable Holdings, Inc. 2.2 % Stifel Financial Corp. 2.2 % Skyworks Solutions, Inc. 2.2 % Dick’s Sporting Goods, Inc. 2.2 % Honeywell International, Inc. 2.2 % Zions Bancorp N.A. 2.2 % | |
| C000047557 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust S&P REIT Index Fund | |
| Class Name | First Trust S&P REIT Index Fund | |
| Trading Symbol | FRI | |
| Security Exchange Name | NYSEArca | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust S&P REIT Index Fund (the “Fund”) for the period of January 1, 2024 to June 30, 2024 (the “Period”). | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FRI | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FRI | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust S&P REIT Index Fund $ 0.49 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 24 | |
| Expense Ratio, Percent | 0.49% | [22] |
| Net Assets | $ 116,839,555 | |
| Holdings Count | Holding | 134 | |
| Investment Company Portfolio Turnover | 3% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Prologis, Inc. 9.9 % Equinix, Inc. 6.8 % Welltower, Inc. 5.9 % Simon Property Group, Inc. 4.7 % Digital Realty Trust, Inc. 4.7 % Realty Income Corp. 4.4 % Public Storage 4.3 % Extra Space Storage, Inc. 3.1 % VICI Properties, Inc. 2.8 % AvalonBay Communities, Inc. 2.8 % REIT Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Prologis, Inc. 9.9 % Equinix, Inc. 6.8 % Welltower, Inc. 5.9 % Simon Property Group, Inc. 4.7 % Digital Realty Trust, Inc. 4.7 % Realty Income Corp. 4.4 % Public Storage 4.3 % Extra Space Storage, Inc. 3.1 % VICI Properties, Inc. 2.8 % AvalonBay Communities, Inc. 2.8 % | |
| C000078718 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | First Trust NASDAQ® ABA Community Bank Index Fund | |
| Class Name | First Trust NASDAQ® ABA Community Bank Index Fund | |
| Trading Symbol | QABA | |
| Security Exchange Name | NASDAQ | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the First Trust NASDAQ ® | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/QABA | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/QABA | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage First Trust NASDAQ ® $ 0.60 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 29 | |
| Expense Ratio, Percent | 0.60% | [23] |
| Net Assets | $ 57,521,244 | |
| Holdings Count | Holding | 128 | |
| Investment Company Portfolio Turnover | 3% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings Commerce Bancshares, Inc. 4.4 % Wintrust Financial Corp. 3.7 % Bank OZK 2.8 % United Bankshares, Inc. 2.7 % First Financial Bankshares, Inc. 2.6 % Hancock Whitney Corp. 2.5 % UMB Financial Corp. 2.5 % International Bancshares Corp. 2.2 % TFS Financial Corp. 2.2 % Ameris Bancorp 2.1 % Industry Allocation | |
| Largest Holdings [Text Block] | Top Ten Holdings Commerce Bancshares, Inc. 4.4 % Wintrust Financial Corp. 3.7 % Bank OZK 2.8 % United Bankshares, Inc. 2.7 % First Financial Bankshares, Inc. 2.6 % Hancock Whitney Corp. 2.5 % UMB Financial Corp. 2.5 % International Bancshares Corp. 2.2 % TFS Financial Corp. 2.2 % Ameris Bancorp 2.1 % | |
| C000222996 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | FT Vest Gold Strategy Target Income ETF® | |
| Class Name | FT Vest Gold Strategy Target Income ETF® | |
| Trading Symbol | IGLD | |
| Security Exchange Name | CboeBZX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the FT Vest Gold Strategy Target Income ETF ® | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/IGLD | |
| Additional Information Phone Number | 1-800-621-1675 | |
| Additional Information Email | info@ftportfolios.com | |
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/IGLD | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage FT Vest Gold Strategy Target Income ETF ® $ 0.85 % (1) (1) Annualized. | |
| Expenses Paid, Amount | $ 44 | |
| Expense Ratio, Percent | 0.85% | [24] |
| Net Assets | $ 98,084,248 | |
| Holdings Count | Holding | 5 | |
| Investment Company Portfolio Turnover | 0% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of June 30, 2024) Fund net assets $ % Total number of portfolio holdings $ % Portfolio turnover rate $ % | |
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of June 30, 2024) The table below shows the investment makeup of the Fund, representing the percentage of net assets of the Fund. Fund Allocation U.S. Treasury Bills 128.5 % Money Market Funds 0.1 % Purchased Options 0.2 % Written Options (29.9%) Net Other Assets and Liabilities 1.1 % Total 100.0 % | |
| [1]Annualized.[2]Annualized.[3]Annualized.[4]Annualized.[5]Annualized.[6]Annualized.[7]Annualized.[8]Annualized.[9]Annualized.[10]Annualized.[11]Annualized.[12]Annualized.[13]Annualized.[14]Annualized.[15]Annualized.[16]Annualized.[17]Annualized.[18]Annualized.[19]Annualized.[20]Annualized.[21]Annualized.[22]Annualized.[23]Annualized.[24]Annualized. | ||
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| C000030351 [Member] | Regeneron Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000030351 [Member] | Carrier Global Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000030351 [Member] | Airbnb Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000030351 [Member] | Samsara Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000030351 [Member] | Otis Worldwide Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000030351 [Member] | Constellation Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000030351 [Member] | Palantir Technologies Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000030351 [Member] | Crowdstrike Holdings Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000030351 [Member] | DraftKings Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030351 [Member] | DoorDash Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030351 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000030351 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17% |
| C000030351 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000030351 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000030351 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000030351 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.60% |
| C000030351 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.10% |
| C000030351 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000030351 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000030351 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000030350 [Member] | Chevron Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.80% |
| C000030350 [Member] | Verizon Communications Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000030350 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000030350 [Member] | Pfizer Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000030350 [Member] | Philip Morris International Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000030350 [Member] | Altria Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000030350 [Member] | International Business Machines Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000030350 [Member] | United Parcel Service Inc Class B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000030350 [Member] | Gilead Sciences Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000030350 [Member] | CVS Health Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030350 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000030350 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000030350 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000030350 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000030350 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.50% |
| C000030350 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000030350 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000030350 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030350 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000030350 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.90% |
| C000238354 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000238354 [Member] | Arista Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000238354 [Member] | Monolithic Power Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000238354 [Member] | Tesla Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000238354 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000238354 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000238354 [Member] | Applied Materials Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000238354 [Member] | Amphenol Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000238354 [Member] | Palo Alto Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000238354 [Member] | Deckers Outdoor Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000238354 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000238354 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000238354 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000238354 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000238354 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000238354 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 33.70% |
| C000238354 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.90% |
| C000238354 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000238354 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000030478 [Member] | Palo Alto Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000030478 [Member] | Datadog Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030478 [Member] | MongoDB Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030478 [Member] | Atlassian Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030478 [Member] | Zscaler Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000030478 [Member] | Adobe Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000030478 [Member] | Intuit Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000030478 [Member] | Fortinet Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000030478 [Member] | Autodesk Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030478 [Member] | ARM Holdings PLC ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030478 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000030478 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000030478 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 89.20% |
| C000030478 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000034137 [Member] | Regeneron Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034137 [Member] | Amphenol Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000034137 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000034137 [Member] | Costco Wholesale Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034137 [Member] | TJX The Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034137 [Member] | Walmart Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Moodys Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000034137 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000034137 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.90% |
| C000034137 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000034137 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.40% |
| C000034137 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.30% |
| C000034137 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000034137 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000034137 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000037913 [Member] | UnitedHealth Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Houlihan Lokey Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Commerce Bancshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Toyota Motor Corp ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Infosys Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Tootsie Roll Industries Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Juniper Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | McCormick And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | ONE Gas Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | AT And T Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000037913 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000037913 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000037913 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.80% |
| C000037913 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000037913 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.10% |
| C000037913 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000037913 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000037913 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.30% |
| C000037913 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000037913 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000201408 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000201408 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000201408 [Member] | Vertiv Holdings Co Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000201408 [Member] | Coinbase Global Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000201408 [Member] | Vistra Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000201408 [Member] | Paychex Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000201408 [Member] | Illinois Tool Works Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000201408 [Member] | Brown And Brown Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000201408 [Member] | Sysco Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000201408 [Member] | Procter And Gamble The Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000201408 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000201408 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000201408 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000201408 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000201408 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000201408 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.10% |
| C000201408 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000201408 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000201408 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000201408 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.60% |
| C000238091 [Member] | Boeing The Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000238091 [Member] | TransDigm Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000238091 [Member] | Lockheed Martin Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000238091 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000238091 [Member] | RTX Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000238091 [Member] | Howmet Aerospace Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000238091 [Member] | HEICO Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000238091 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000238091 [Member] | L3Harris Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000238091 [Member] | Woodward Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000238091 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000238091 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000238091 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000244355 [Member] | AT And T Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000244355 [Member] | HP Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000244355 [Member] | Skyworks Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000244355 [Member] | Hewlett Packard Enterprise Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000244355 [Member] | Warner Bros Discovery Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000244355 [Member] | Cisco Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000244355 [Member] | NetApp Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000244355 [Member] | Synchrony Financial [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000244355 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000244355 [Member] | Electronic Arts Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000244355 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000244355 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| C000244355 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000244355 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.10% |
| C000244355 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000244355 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000244355 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.50% |
| C000244355 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000244355 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000244355 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000047627 [Member] | Diamondback Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000047627 [Member] | Western Midstream Partners L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000047627 [Member] | Hess Midstream L P Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000047627 [Member] | EOG Resources Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000047627 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000047627 [Member] | Occidental Petroleum Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000047627 [Member] | Devon Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000047627 [Member] | APA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000047627 [Member] | Coterra Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000047627 [Member] | EQT Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000047627 [Member] | Oil And Gas Storage And Transportation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000047627 [Member] | Integrated Oil And Gas [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000047627 [Member] | Oil And Gas Exploration And Production Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83.30% |
| C000047627 [Member] | Gas Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000047627 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000191287 [Member] | Chevron Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Verizon Communications Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Boeing The Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Cisco Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000191287 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000191287 [Member] | Amgen Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000191287 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Caterpillar Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000191287 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.30% |
| C000191287 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000191287 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.70% |
| C000191287 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10% |
| C000191287 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.50% |
| C000191287 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.50% |
| C000191287 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.70% |
| C000191287 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000191287 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000222997 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| C000222997 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000222997 [Member] | US Treasury Bill Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| C000222997 [Member] | Purchased Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000222997 [Member] | Written Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.40%) |
| C000222997 [Member] | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000241319 [Member] | Carlisle Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000241319 [Member] | Diamondback Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000241319 [Member] | Weatherford International PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000241319 [Member] | Westinghouse Air Brake Technologies Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000241319 [Member] | Valero Energy Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000241319 [Member] | Permian Resources Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000241319 [Member] | Marathon Oil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000241319 [Member] | Dover Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000241319 [Member] | Cummins Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000241319 [Member] | Advanced Drainage Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000241319 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37% |
| C000241319 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 29.20% |
| C000241319 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000241319 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.50% |
| C000241319 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.40% |
| C000241319 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000029773 [Member] | VSE Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000029773 [Member] | Powell Industries Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000029773 [Member] | Crescent Energy Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000029773 [Member] | CRA International Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000029773 [Member] | ACM Research Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000029773 [Member] | ScanSource Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000029773 [Member] | Genco Shipping And Trading Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000029773 [Member] | Barrett Business Services Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000029773 [Member] | CECO Environmental Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000029773 [Member] | Cullinan Therapeutics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000029773 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.30% |
| C000029773 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000029773 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000029773 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000029773 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.40% |
| C000029773 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000029773 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000029773 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27% |
| C000029773 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000029773 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000030477 [Member] | Tesla Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Palo Alto Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Datadog Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | MongoDB Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Atlassian Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Zscaler Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Adobe Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Intuit Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Diamondback Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000030477 [Member] | Baker Hughes Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000030477 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000030477 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.80% |
| C000030477 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.10% |
| C000030477 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000030477 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000030477 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000030477 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 38.30% |
| C000030477 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000030477 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000030477 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000033930 [Member] | Airbnb Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000033930 [Member] | Arista Networks Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000033930 [Member] | Cisco Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000033930 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000033930 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.10% |
| C000033930 [Member] | Meta Platforms Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000033930 [Member] | Netflix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000033930 [Member] | Alphabet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000033930 [Member] | Booking Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000033930 [Member] | Alphabet Inc Class C [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000033930 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000033930 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 29.90% |
| C000033930 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.40% |
| C000033930 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000033930 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 38.40% |
| C000033930 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000033930 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000033930 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000033929 [Member] | Regeneron Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000033929 [Member] | Biogen Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000033929 [Member] | Amgen Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000033929 [Member] | Alnylam Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000033929 [Member] | Corcept Therapeutics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000033929 [Member] | United Therapeutics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000033929 [Member] | Halozyme Therapeutics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000033929 [Member] | Vertex Pharmaceuticals Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000033929 [Member] | Natera Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000033929 [Member] | Argenx SE ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000033929 [Member] | Biotechnology [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 78.50% |
| C000033929 [Member] | Pharmaceuticals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000033929 [Member] | Life Sciences Tools And Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.70% |
| C000033929 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000035622 [Member] | Tesla Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Warner Bros Discovery Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Diamondback Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Baker Hughes Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000035622 [Member] | Biogen Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Charter Communications Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | MercadoLibre Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Comcast Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000035622 [Member] | Intuitive Surgical Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000035622 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000035622 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.30% |
| C000035622 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000035622 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000035622 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.80% |
| C000035622 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000035622 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000035622 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000035622 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000035622 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000041643 [Member] | Tesla Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.80% |
| C000041643 [Member] | Goldman Sachs Financial Square Treasury Obligations Fund Institutional Class [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000041643 [Member] | ON Semiconductor Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000041643 [Member] | First Solar Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000041643 [Member] | Enphase Energy Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000041643 [Member] | Albemarle Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000041643 [Member] | Rivian Automotive Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000041643 [Member] | Universal Display Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000041643 [Member] | Acuity Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000041643 [Member] | Brookfield Renewable Partners L P [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000041643 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000041643 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000041643 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.50% |
| C000041643 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.10% |
| C000041643 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.10% |
| C000041643 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000041643 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000041643 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000047628 [Member] | Veralto Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000047628 [Member] | American Water Works Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000047628 [Member] | Xylem Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000047628 [Member] | Ecolab Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000047628 [Member] | Roper Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000047628 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000047628 [Member] | Essential Utilities Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000047628 [Member] | Ferguson PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000047628 [Member] | AECOM [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000047628 [Member] | Tetra Tech Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000047628 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000047628 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000047628 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 55.50% |
| C000047628 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000047628 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.90% |
| C000047628 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000047628 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000047628 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000037851 [Member] | Skyworks Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000037851 [Member] | Garmin Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000037851 [Member] | Synovus Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000037851 [Member] | Microchip Technology Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Equitable Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Stifel Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Honeywell International Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Zions Bancorp N A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Dicks Sporting Goods Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000037851 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.90% |
| C000037851 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000037851 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000037851 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000037851 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000037851 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.40% |
| C000037851 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000037851 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.20% |
| C000037851 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000037851 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000047557 [Member] | Prologis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000047557 [Member] | Equinix Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000047557 [Member] | Welltower Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000047557 [Member] | Simon Property Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000047557 [Member] | Digital Realty Trust Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000047557 [Member] | Realty Income Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000047557 [Member] | Public Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000047557 [Member] | Extra Space Storage Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000047557 [Member] | VICI Properties Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000047557 [Member] | AvalonBay Communities Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000047557 [Member] | Unclassified Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000047557 [Member] | Retail REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000047557 [Member] | Industrial REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.60% |
| C000047557 [Member] | Health Care REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14% |
| C000047557 [Member] | Multi Family Residential REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| C000047557 [Member] | Data Center REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| C000047557 [Member] | Self Storage REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000047557 [Member] | Other Specialized REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000047557 [Member] | Single Family Residential REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000047557 [Member] | Office REITs [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000078718 [Member] | Commerce Bancshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000078718 [Member] | Wintrust Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000078718 [Member] | Bank OZK [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000078718 [Member] | United Bankshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000078718 [Member] | First Financial Bankshares Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000078718 [Member] | Hancock Whitney Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000078718 [Member] | UMB Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000078718 [Member] | International Bancshares Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000078718 [Member] | TFS Financial Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000078718 [Member] | Ameris Bancorp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000078718 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000078718 [Member] | Banks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.10% |
| C000078718 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000078718 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000222996 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| C000222996 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000222996 [Member] | US Treasury Bill Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 128.50% |
| C000222996 [Member] | Purchased Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000222996 [Member] | Written Options [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (29.90%) |
| C000222996 [Member] | Net Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
