110002 - Disclosure - First Trust Nasdaq Bank ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 110003 - Disclosure - First Trust Nasdaq Bank ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 110004 - Disclosure - First Trust Nasdaq Bank ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 110005 - Disclosure - First Trust Nasdaq Bank ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 110006 - Disclosure - First Trust Nasdaq Bank ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 120010 - Disclosure - First Trust Nasdaq Bank ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 120020 - Disclosure - First Trust Nasdaq Bank ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 120030 - Disclosure - First Trust Nasdaq Bank ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 120040 - Disclosure - First Trust Nasdaq Bank ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 120045 - Disclosure - First Trust Nasdaq Bank ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 120050 - Disclosure - First Trust Nasdaq Bank ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120060 - Disclosure - First Trust Nasdaq Bank ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120070 - Disclosure - First Trust Nasdaq Bank ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 110000 - Disclosure - First Trust Nasdaq Bank ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 110001 - Disclosure - First Trust Nasdaq Bank ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 210002 - Disclosure - First Trust Nasdaq Food and Beverage ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 210003 - Disclosure - First Trust Nasdaq Food and Beverage ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 210004 - Disclosure - First Trust Nasdaq Food and Beverage ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 210005 - Disclosure - First Trust Nasdaq Food and Beverage ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 210006 - Disclosure - First Trust Nasdaq Food and Beverage ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 220010 - Disclosure - First Trust Nasdaq Food and Beverage ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 220020 - Disclosure - First Trust Nasdaq Food and Beverage ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 220030 - Disclosure - First Trust Nasdaq Food and Beverage ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 220040 - Disclosure - First Trust Nasdaq Food and Beverage ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 220045 - Disclosure - First Trust Nasdaq Food and Beverage ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 220050 - Disclosure - First Trust Nasdaq Food and Beverage ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220060 - Disclosure - First Trust Nasdaq Food and Beverage ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220070 - Disclosure - First Trust Nasdaq Food and Beverage ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 210000 - Disclosure - First Trust Nasdaq Food and Beverage ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 210001 - Disclosure - First Trust Nasdaq Food and Beverage ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 310002 - Disclosure - First Trust Nasdaq Oil and Gas ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 310003 - Disclosure - First Trust Nasdaq Oil and Gas ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 310004 - Disclosure - First Trust Nasdaq Oil and Gas ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 310005 - Disclosure - First Trust Nasdaq Oil and Gas ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 310006 - Disclosure - First Trust Nasdaq Oil and Gas ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 320010 - Disclosure - First Trust Nasdaq Oil and Gas ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 320020 - Disclosure - First Trust Nasdaq Oil and Gas ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 320030 - Disclosure - First Trust Nasdaq Oil and Gas ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 320040 - Disclosure - First Trust Nasdaq Oil and Gas ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 320045 - Disclosure - First Trust Nasdaq Oil and Gas ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 320050 - Disclosure - First Trust Nasdaq Oil and Gas ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 320060 - Disclosure - First Trust Nasdaq Oil and Gas ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 320070 - Disclosure - First Trust Nasdaq Oil and Gas ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 310000 - Disclosure - First Trust Nasdaq Oil and Gas ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 310001 - Disclosure - First Trust Nasdaq Oil and Gas ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 410002 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 410003 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 410004 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 410005 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 410006 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 420010 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 420020 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 420030 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 420040 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 420045 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 420050 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420060 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420070 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 410000 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 410001 - Disclosure - First Trust Nasdaq Pharmaceuticals ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 510002 - Disclosure - First Trust Nasdaq Semiconductor ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 510003 - Disclosure - First Trust Nasdaq Semiconductor ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 510004 - Disclosure - First Trust Nasdaq Semiconductor ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 510005 - Disclosure - First 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Trust Nasdaq Semiconductor ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 520060 - Disclosure - First Trust Nasdaq Semiconductor ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 520070 - Disclosure - First Trust Nasdaq Semiconductor ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 510000 - Disclosure - First Trust Nasdaq Semiconductor ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 510001 - Disclosure - First Trust Nasdaq Semiconductor ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 610002 - Disclosure - First Trust Nasdaq Transportation ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 610003 - Disclosure - First Trust Nasdaq Transportation ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 610004 - Disclosure - First Trust Nasdaq Transportation ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 610005 - Disclosure - First Trust Nasdaq Transportation ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 610006 - Disclosure - First Trust Nasdaq Transportation ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 620010 - Disclosure - First Trust Nasdaq Transportation ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 620020 - Disclosure - First Trust Nasdaq Transportation ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 620030 - Disclosure - First Trust Nasdaq Transportation ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 620040 - Disclosure - First Trust Nasdaq Transportation ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 620045 - Disclosure - First Trust Nasdaq Transportation ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 620050 - Disclosure - First Trust Nasdaq Transportation ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 620060 - Disclosure - First Trust Nasdaq Transportation ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 620070 - Disclosure - First Trust Nasdaq Transportation ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 610000 - Disclosure - First Trust Nasdaq Transportation ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 610001 - Disclosure - First Trust Nasdaq Transportation ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 710002 - Disclosure - Emerging Markets Equity Select ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 710003 - Disclosure - Emerging Markets Equity Select ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 710004 - Disclosure - Emerging Markets Equity Select ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 710005 - Disclosure - Emerging Markets Equity Select ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 710006 - Disclosure - Emerging Markets Equity Select ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 720010 - Disclosure - Emerging Markets Equity Select ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 720020 - Disclosure - Emerging Markets Equity Select ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 720030 - Disclosure - Emerging Markets Equity Select ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 720040 - Disclosure - Emerging Markets Equity Select ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 720045 - Disclosure - Emerging Markets Equity Select ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 720050 - Disclosure - Emerging Markets Equity Select ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 720060 - Disclosure - Emerging Markets Equity Select ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 720070 - Disclosure - Emerging Markets Equity Select ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 710000 - Disclosure - Emerging Markets Equity Select ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 710001 - Disclosure - Emerging Markets Equity Select ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 810002 - Disclosure - First Trust S-Network E-Commerce ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 810003 - Disclosure - First Trust S-Network E-Commerce ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 810004 - Disclosure - First Trust S-Network E-Commerce ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 810005 - Disclosure - First Trust S-Network E-Commerce ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 810006 - Disclosure - First Trust S-Network E-Commerce ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 820010 - Disclosure - First Trust S-Network E-Commerce ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 820020 - Disclosure - First Trust S-Network E-Commerce ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 820030 - Disclosure - First Trust S-Network E-Commerce ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 820040 - Disclosure - First Trust S-Network E-Commerce ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 820045 - Disclosure - First Trust S-Network E-Commerce ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 820050 - Disclosure - First Trust S-Network E-Commerce ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 820060 - Disclosure - First Trust S-Network E-Commerce ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 820070 - Disclosure - First Trust S-Network E-Commerce ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 810000 - Disclosure - First Trust S-Network E-Commerce ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 810001 - Disclosure - First Trust S-Network E-Commerce ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 910002 - Disclosure - First Trust Indxx Medical Devices ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 910003 - Disclosure - First Trust Indxx Medical Devices ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 910004 - Disclosure - First Trust Indxx Medical Devices ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 910005 - Disclosure - First Trust Indxx Medical Devices ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 910006 - Disclosure - First Trust Indxx Medical Devices ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 920010 - Disclosure - First Trust Indxx Medical Devices ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 920020 - Disclosure - First Trust Indxx Medical Devices ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 920030 - Disclosure - First Trust Indxx Medical Devices ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 920040 - Disclosure - First Trust Indxx Medical Devices ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 920045 - Disclosure - First Trust Indxx Medical Devices ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 920050 - Disclosure - First Trust Indxx Medical Devices ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 920060 - Disclosure - First Trust Indxx Medical Devices ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 920070 - Disclosure - First Trust Indxx Medical Devices ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 910000 - Disclosure - First Trust Indxx Medical Devices ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 910001 - Disclosure - First Trust Indxx Medical Devices ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1010002 - Disclosure - First Trust S-Network Streaming and Gaming ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1010003 - Disclosure - First Trust S-Network Streaming and Gaming ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1010004 - Disclosure - First Trust S-Network Streaming and Gaming ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1010005 - Disclosure - First Trust S-Network Streaming and Gaming ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1010006 - Disclosure - First Trust S-Network Streaming and Gaming ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1020010 - Disclosure - First Trust S-Network Streaming and Gaming ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1020020 - Disclosure - First Trust S-Network Streaming and Gaming ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1020030 - Disclosure - First Trust S-Network Streaming and Gaming ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1020040 - Disclosure - First Trust S-Network Streaming and Gaming ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1020045 - Disclosure - First Trust S-Network Streaming and Gaming ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1020050 - Disclosure - First Trust S-Network Streaming and Gaming ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1020060 - Disclosure - First Trust S-Network Streaming and Gaming ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1020070 - Disclosure - First Trust S-Network Streaming and Gaming ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1010000 - Disclosure - First Trust S-Network Streaming and Gaming ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1010001 - Disclosure - First Trust S-Network Streaming and Gaming ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1110002 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1110003 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1110004 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1110005 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1110006 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1120010 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1120020 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1120030 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1120040 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1120045 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1120050 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1120060 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1120070 - Disclosure - First Trust Bloomberg Shareholder Yield ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1110000 - Disclosure - First Trust Bloomberg Shareholder Yield ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1110001 - Disclosure - First Trust Bloomberg Shareholder Yield ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1210002 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1210003 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1210004 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1210005 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1210006 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1220010 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1220020 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1220030 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1220040 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1220045 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1220050 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1220060 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1220070 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1210000 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1210001 - Disclosure - First Trust S&P 500 Diversified Dividend Aristocrats ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1310002 - Disclosure - First Trust SMID Capital Strength ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1310003 - Disclosure - First Trust SMID Capital Strength ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1310004 - Disclosure - First Trust SMID Capital Strength ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1310005 - Disclosure - First Trust SMID Capital Strength ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1310006 - Disclosure - First Trust SMID Capital Strength ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1320010 - Disclosure - First Trust SMID Capital Strength ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1320020 - Disclosure - First Trust SMID Capital Strength ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1320030 - Disclosure - First Trust SMID Capital Strength ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1320040 - Disclosure - First Trust SMID Capital Strength ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1320045 - Disclosure - First Trust SMID Capital Strength ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1320050 - Disclosure - First Trust SMID Capital Strength ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1320060 - Disclosure - First Trust SMID Capital Strength ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1320070 - Disclosure - First Trust SMID Capital Strength ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1310000 - Disclosure - First Trust SMID Capital Strength ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1310001 - Disclosure - First Trust SMID Capital Strength ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1410002 - Disclosure - First Trust SMID Growth Strength ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1410003 - Disclosure - First Trust SMID Growth Strength ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1410004 - Disclosure - First Trust SMID Growth Strength ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1410005 - Disclosure - First Trust SMID Growth Strength ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1410006 - Disclosure - First Trust SMID Growth Strength ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1420010 - Disclosure - First Trust SMID Growth Strength ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1420020 - Disclosure - First Trust SMID Growth Strength ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1420030 - Disclosure - First Trust SMID Growth Strength ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1420040 - Disclosure - First Trust SMID Growth Strength ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1420045 - Disclosure - First Trust SMID Growth Strength ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1420050 - Disclosure - First Trust SMID Growth Strength ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1420060 - Disclosure - First Trust SMID Growth Strength ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1420070 - Disclosure - First Trust SMID Growth Strength ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1410000 - Disclosure - First Trust SMID Growth Strength ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1410001 - Disclosure - First Trust SMID Growth Strength ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1510002 - Disclosure - First Trust Bloomberg R&D Leaders ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1510003 - Disclosure - First Trust Bloomberg R&D Leaders ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1510004 - Disclosure - First Trust Bloomberg R&D Leaders ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1510005 - Disclosure - First Trust Bloomberg R&D Leaders ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1510006 - Disclosure - First Trust Bloomberg R&D Leaders ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1520010 - Disclosure - First Trust Bloomberg R&D Leaders ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1520020 - Disclosure - First Trust Bloomberg R&D Leaders ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1520030 - Disclosure - First Trust Bloomberg R&D Leaders ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1520040 - Disclosure - First Trust Bloomberg R&D Leaders ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1520045 - Disclosure - First Trust Bloomberg R&D Leaders ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1520050 - Disclosure - First Trust Bloomberg R&D Leaders ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1520060 - Disclosure - First Trust Bloomberg R&D Leaders ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1520070 - Disclosure - First Trust Bloomberg R&D Leaders ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1510000 - Disclosure - First Trust Bloomberg R&D Leaders ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1510001 - Disclosure - First Trust Bloomberg R&D Leaders ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1610002 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1610003 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1610004 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1610005 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1610006 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1620010 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1620020 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1620030 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1620040 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1620045 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1620050 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1620060 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1620070 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1610000 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1610001 - Disclosure - First Trust New Constructs Core Earnings Leaders ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1710002 - Disclosure - First Trust Balanced Income ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1710003 - Disclosure - First Trust Balanced Income ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1710004 - Disclosure - First Trust Balanced Income ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1710005 - Disclosure - First Trust Balanced Income ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1710006 - Disclosure - First Trust Balanced Income ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1720010 - Disclosure - First Trust Balanced Income ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1720020 - Disclosure - First Trust Balanced Income ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1720030 - Disclosure - First Trust Balanced Income ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1720040 - Disclosure - First Trust Balanced Income ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1720045 - Disclosure - First Trust Balanced Income ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1720050 - Disclosure - First Trust Balanced Income ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1720060 - Disclosure - First Trust Balanced Income ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1720070 - Disclosure - First Trust Balanced Income ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1710000 - Disclosure - First Trust Balanced Income ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1710001 - Disclosure - First Trust Balanced Income ETF N-1A Supplement link:presentationLink link:definitionLink link:calculationLink First Trust Nasdaq Bank ETF S000053942 [Member] C000169744 [Member] Nasdaq US Smart Banks(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US Benchmark Banks(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US Benchmark(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Authorized Participant Concentration Risk [Member] Banks Risk [Member] Current Market Conditions Risk [Member] Cyber Security Risk [Member] Depositary Receipts Risk [Member] Equity Securities Risk [Member] Financial Companies Risk [Member] Index Concentration Risk [Member] Index Or Model Constituent Risk [Member] Index Provider Risk [Member] Large Capitalization Companies Risk [Member] Market Maker Risk [Member] Market Risk [Member] Momentum Investing Risk [Member] Non Correlation Risk [Member] Risk Nondiversified [Member] Non US Securities Risk [Member] Operational Risk [Member] Passive Investment Risk [Member] Premium Discount Risk [Member] Smaller Companies Risk [Member] Trading Issues Risk [Member] First Trust Nasdaq Food and Beverage ETF S000053943 [Member] C000169745 [Member] Nasdaq US Smart Food & Beverage(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US Benchmark Food, Beverage and Tobacco(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Consumer Staples Companies Risk [Member] Food And Beverage Companies Risk [Member] First Trust Nasdaq Oil and Gas ETF S000053944 [Member] C000169746 [Member] Nasdaq US Smart Oil & Gas(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US Benchmark Energy(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Energy Companies Risk [Member] Oil And Gas Companies Risk [Member] First Trust Nasdaq Pharmaceuticals ETF S000053945 [Member] C000169747 [Member] Nasdaq US Smart Pharmaceuticals(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US Benchmark Pharmaceuticals(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Biotechnology Companies Risk [Member] Health Care Companies Risk [Member] Pharmaceutical Companies Risk [Member] First Trust Nasdaq Semiconductor ETF S000053947 [Member] C000169749 [Member] Nasdaq US Smart Semiconductor(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US Benchmark Semiconductors(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Information Technology Companies Risk [Member] Semiconductor Companies Risk [Member] First Trust Nasdaq Transportation ETF S000053948 [Member] C000169750 [Member] Nasdaq US Smart Transportation(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US Benchmark Industrial Transportation(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Consumer Discretionary Companies Risk [Member] Industrials Companies Risk [Member] Transportation Companies Risk [Member] Emerging Markets Equity Select ETF S000058145 [Member] C000190378 [Member] Nasdaq Riskalyze Emerging Markets(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Emerging Large Mid Cap(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Asia Risk [Member] Currency Risk [Member] Emerging Markets Risk [Member] India Risk [Member] Liquidity Risk [Member] Low Volatility Risk [Member] Mid Capitalization Companies Risk [Member] Preferred Securities Risk [Member] REIT Risk [Member] Valuation Risk [Member] Variable Interest Entities Risk [Member] First Trust S-Network E-Commerce ETF S000053946 [Member] C000169748 [Member] S-Network Global E-Commerce Index(TM) (reflects no deduction for fees, expenses or taxes)[Member] MSCI ACWI Index (reflects no deduction for fees, expenses or taxes)[Member] Communication Services Companies Risk [Member] Internet Companies Risk [Member] Online Retail Risk [Member] Portfolio Turnover Risk [Member] First Trust Indxx Medical Devices ETF S000071976 [Member] C000227613 [Member] Indxx Medical Devices Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI World Health Care Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI World Index (reflects no deduction for fees, expenses or taxes)[Member] Europe Risk [Member] First Trust S-Network Streaming and Gaming ETF S000071853 [Member] C000227379 [Member] S-Network Streaming & Gaming Index (reflects no deduction for fees, expenses or taxes)[Member] Streaming And Gaming Risk [Member] First Trust Bloomberg Shareholder Yield ETF S000058146 [Member] C000190379 [Member] Bloomberg Shareholder Yield Index (reflects no deduction for fees, expenses, or taxes)[Member] S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] Dividends Risk [Member] Inflation Risk [Member] First Trust S&P 500 Diversified Dividend Aristocrats ETF S000058149 [Member] First Trust S&P 500 Diversified Dividend Aristocrats ETF C000190382 [Member] S&P 500® Sector-Neutral Dividend Aristocrats Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq US 500 Large Cap(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] First Trust SMID Capital Strength ETF S000058147 [Member] C000190380 [Member] The SMID Capital Strength Index (reflects no deduction for fees, expenses or taxes)[Member] Russell 2500(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] Russell 3000® Index (reflects no deduction for fees, expenses or taxes)[Member] Market Capitalization Deviation Risk [Member] Small Capitalization Companies Risk [Member] First Trust SMID Growth Strength ETF S000058148 [Member] C000190381 [Member] The SMID Growth Strength Index (reflects no deduction for fees, expenses or taxes)[Member] S&P 1000® Index (reflects no deduction for fees, expenses or taxes)[Member] Growth Stocks Investment Risk [Member] First Trust Bloomberg R&D Leaders ETF S000084510 [Member] First Trust Bloomberg R&D Leaders ETF C000248907 [Member] Bloomberg R&D Leaders Select Index (reflects no deduction for fees, expenses or taxes)[Member] First Trust New Constructs Core Earnings Leaders ETF S000085758 [Member] C000251153 [Member] Bloomberg New Constructs Core Earnings Leaders Index (reflects no deduction for fees, expenses or taxes)[Member] First Trust Balanced Income ETF S000091415 [Member] C000259078 [Member] Asset Backed Securities Risk [Member] Bank Loans Risk [Member] Call Options Risk [Member] Call Risk [Member] Commodities Risk [Member] Conflict Of Interest Risk [Member] Counterparty Risk [Member] Credit Rating Agency Risk [Member] Credit Risk [Member] Debt Securities Risk [Member] Derivatives Risk [Member] Distribution Tax Risk [Member] ETF Risk [Member] Extension Risk [Member] Flex Options Risk [Member] Floating Rate Debt Instruments Risk [Member] Gold ETP Risk [Member] Income Risk [Member] Index Rebalance Risk [Member] Interest Rate Risk [Member] Mortgage Related Securities Risk [Member] Municipal Securities Risk [Member] Options Risk [Member] Portfolio Correlation Risk [Member] Prepayment Risk [Member] Senior Loan Risk [Member] Sovereign Debt Securities Risk [Member] Tax Risk From Investment In Other Investment Companies [Member] US Government Securities Risk [Member] Value Stocks Investment Risk [Member]