110001 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 110002 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 110003 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 110004 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 110005 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 120010 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 120020 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 120030 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 120040 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 120045 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 120050 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120060 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120070 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 110000 - Disclosure - First Trust Asia Pacific ex-Japan AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 210001 - Disclosure - First Trust China AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 210002 - Disclosure - First Trust China AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 210003 - Disclosure - First Trust China AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 210004 - Disclosure - First Trust China AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 210005 - Disclosure - First Trust China AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 220010 - Disclosure - First Trust China AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 220020 - Disclosure - First Trust China AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 220030 - Disclosure - First Trust China AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 220040 - Disclosure - First Trust China AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 220045 - Disclosure - First Trust China AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 220050 - Disclosure - First Trust China AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220060 - Disclosure - First Trust China AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220070 - Disclosure - First Trust China AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 210000 - Disclosure - First Trust China AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 310001 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 310002 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 310003 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 310004 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 310005 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 320010 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 320020 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 320030 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 320040 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 320045 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 320050 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 320060 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 320070 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 310000 - Disclosure - First Trust Developed Markets ex-US AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 410001 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 410002 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 410003 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 410004 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 410005 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 420010 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 420020 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 420030 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 420040 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 420045 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 420050 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420060 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420070 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 410000 - Disclosure - First Trust Developed Markets ex-US Small Cap AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 510001 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 510002 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 510003 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 510004 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 510005 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 520010 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 520020 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 520030 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 520040 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 520045 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 520050 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 520060 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 520070 - Disclosure - First Trust Emerging Markets AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 510000 - Disclosure - First Trust Emerging Markets AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 610001 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 610002 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 610003 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 610004 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 610005 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 620010 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 620020 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 620030 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 620040 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 620045 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 620050 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 620060 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 620070 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 610000 - Disclosure - First Trust Emerging Markets Small Cap AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 710001 - Disclosure - First Trust Europe AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 710002 - Disclosure - First Trust Europe AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 710003 - Disclosure - First Trust Europe AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 710004 - Disclosure - First Trust Europe AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 710005 - Disclosure - First Trust Europe AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 720010 - Disclosure - First Trust Europe AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 720020 - Disclosure - First Trust Europe AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 720030 - Disclosure - First Trust Europe AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 720040 - Disclosure - First Trust Europe AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 720045 - Disclosure - First Trust Europe AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 720050 - Disclosure - First Trust Europe AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 720060 - Disclosure - First Trust Europe AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 720070 - Disclosure - First Trust Europe AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 710000 - Disclosure - First Trust Europe AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 810001 - Disclosure - First Trust Eurozone AlphaDEX ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 810002 - Disclosure - First Trust Eurozone AlphaDEX ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 810003 - Disclosure - First Trust Eurozone AlphaDEX ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 810004 - Disclosure - First Trust Eurozone AlphaDEX ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 810005 - Disclosure - First Trust Eurozone AlphaDEX ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 820010 - Disclosure - First Trust Eurozone AlphaDEX ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 820020 - Disclosure - First Trust Eurozone AlphaDEX ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 820030 - Disclosure - First Trust Eurozone AlphaDEX ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 820040 - Disclosure - First Trust Eurozone AlphaDEX ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 820045 - Disclosure - First Trust Eurozone AlphaDEX ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 820050 - Disclosure - First Trust Eurozone AlphaDEX ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 820060 - Disclosure - First Trust Eurozone AlphaDEX ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 820070 - Disclosure - First Trust Eurozone AlphaDEX ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 810000 - Disclosure - First Trust Eurozone AlphaDEX ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 910001 - Disclosure - First Trust Germany AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 910002 - Disclosure - First Trust Germany AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 910003 - Disclosure - First Trust Germany AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 910004 - Disclosure - First Trust Germany AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 910005 - Disclosure - First Trust Germany AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 920010 - Disclosure - First Trust Germany AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 920020 - Disclosure - First Trust Germany AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 920030 - Disclosure - First Trust Germany AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 920040 - Disclosure - First Trust Germany AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 920045 - Disclosure - First Trust Germany AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 920050 - Disclosure - First Trust Germany AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 920060 - Disclosure - First Trust Germany AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 920070 - Disclosure - First Trust Germany AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 910000 - Disclosure - First Trust Germany AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1010001 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1010002 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1010003 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1010004 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Investment Risks link:presentationLink link:definitionLink link:calculationLink 1010005 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Performance Management link:presentationLink link:definitionLink link:calculationLink 1020010 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1020020 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1020030 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Expense Example link:presentationLink link:definitionLink link:calculationLink 1020040 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1020045 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Risks Data link:presentationLink link:definitionLink link:calculationLink 1020050 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1020060 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1020070 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1010000 - Disclosure - First Trust India NIFTY 50 Equal Weight ETF N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1110001 - Disclosure - First Trust Japan AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1110002 - Disclosure - First Trust Japan AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1110003 - Disclosure - First Trust Japan AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1110004 - Disclosure - First Trust Japan AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 1110005 - Disclosure - First Trust Japan AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 1120010 - Disclosure - First Trust Japan AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1120020 - Disclosure - First Trust Japan AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1120030 - Disclosure - First Trust Japan AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 1120040 - Disclosure - First Trust Japan AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1120045 - Disclosure - First Trust Japan AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 1120050 - Disclosure - First Trust Japan AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1120060 - Disclosure - First Trust Japan AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1120070 - Disclosure - First Trust Japan AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1110000 - Disclosure - First Trust Japan AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1210001 - Disclosure - First Trust Latin America AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1210002 - Disclosure - First Trust Latin America AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1210003 - Disclosure - First Trust Latin America AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1210004 - Disclosure - First Trust Latin America AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 1210005 - Disclosure - First Trust Latin America AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 1220010 - Disclosure - First Trust Latin America AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1220020 - Disclosure - First Trust Latin America AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1220030 - Disclosure - First Trust Latin America AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 1220040 - Disclosure - First Trust Latin America AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1220045 - Disclosure - First Trust Latin America AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 1220050 - Disclosure - First Trust Latin America AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1220060 - Disclosure - First Trust Latin America AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1220070 - Disclosure - First Trust Latin America AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1210000 - Disclosure - First Trust Latin America AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1310001 - Disclosure - First Trust Switzerland AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1310002 - Disclosure - First Trust Switzerland AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1310003 - Disclosure - First Trust Switzerland AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1310004 - Disclosure - First Trust Switzerland AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 1310005 - Disclosure - First Trust Switzerland AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 1320010 - Disclosure - First Trust Switzerland AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1320020 - Disclosure - First Trust Switzerland AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1320030 - Disclosure - First Trust Switzerland AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 1320040 - Disclosure - First Trust Switzerland AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1320045 - Disclosure - First Trust Switzerland AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 1320050 - Disclosure - First Trust Switzerland AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1320060 - Disclosure - First Trust Switzerland AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1320070 - Disclosure - First Trust Switzerland AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1310000 - Disclosure - First Trust Switzerland AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1410001 - Disclosure - First Trust United Kingdom AlphaDEX Fund Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1410002 - Disclosure - First Trust United Kingdom AlphaDEX Fund Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1410003 - Disclosure - First Trust United Kingdom AlphaDEX Fund Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1410004 - Disclosure - First Trust United Kingdom AlphaDEX Fund Investment Risks link:presentationLink link:definitionLink link:calculationLink 1410005 - Disclosure - First Trust United Kingdom AlphaDEX Fund Performance Management link:presentationLink link:definitionLink link:calculationLink 1420010 - Disclosure - First Trust United Kingdom AlphaDEX Fund Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1420020 - Disclosure - First Trust United Kingdom AlphaDEX Fund Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1420030 - Disclosure - First Trust United Kingdom AlphaDEX Fund Expense Example link:presentationLink link:definitionLink link:calculationLink 1420040 - Disclosure - First Trust United Kingdom AlphaDEX Fund Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1420045 - Disclosure - First Trust United Kingdom AlphaDEX Fund Risks Data link:presentationLink link:definitionLink link:calculationLink 1420050 - Disclosure - First Trust United Kingdom AlphaDEX Fund Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1420060 - Disclosure - First Trust United Kingdom AlphaDEX Fund Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1420070 - Disclosure - First Trust United Kingdom AlphaDEX Fund Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1410000 - Disclosure - First Trust United Kingdom AlphaDEX Fund N-1A Cover link:presentationLink link:definitionLink link:calculationLink First Trust Asia Pacific ex-Japan AlphaDEX Fund S000031803 [Member] C000099057 [Member] Nasdaq AlphaDEX® Asia Pacific Ex-Japan™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Developed Markets Asia Pacific Ex-Japan™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI Pacific ex-Japan Index (reflects no deduction for fees, expenses or taxes)[Member] Asia Risk [Member] Asia Pacific Risk [Member] Authorized Participant Concentration Risk [Member] Cash Transactions Risk [Member] Currency Risk [Member] Current Market Conditions Risk [Member] Cyber Security Risk [Member] Depositary Receipts Risk [Member] Equity Securities Risk [Member] Growth Stocks Investment Risk [Member] Index Concentration Risk [Member] Index Or Model Constituent Risk [Member] Index Provider Risk [Member] Industrials Companies Risk [Member] Inflation Risk [Member] International Closed Market Trading Risk [Member] Large Capitalization Companies Risk [Member] Liquidity Risk [Member] Market Maker Risk [Member] Market Risk [Member] Mid Capitalization Companies Risk [Member] Non Correlation Risk [Member] Non US Securities Risk [Member] Operational Risk [Member] Passive Investment Risk [Member] Portfolio Turnover Risk [Member] Preferred Securities Risk [Member] Premium Discount Risk [Member] REIT Risk [Member] Small Capitalization Companies Risk [Member] South Korea Risk [Member] Trading Issues Risk [Member] Valuation Risk [Member] Value Stocks Investment Risk [Member] Variable Interest Entities Risk [Member] First Trust China AlphaDEX Fund S000031799 [Member] C000099053 [Member] Nasdaq AlphaDEX® China™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq China™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI China Index (reflects no deduction for fees, expenses or taxes)[Member] China Risk [Member] Emerging Markets Risk [Member] Financial Companies Risk [Member] Materials Companies Risk [Member] First Trust Developed Markets ex-US AlphaDEX Fund S000031802 [Member] C000099056 [Member] Nasdaq AlphaDEX® Developed Markets Ex-US™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Developed Markets Ex-US™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI World ex USA Index (reflects no deduction for fees, expenses or taxes)[Member] Europe Risk [Member] Japan Risk [Member] First Trust Developed Markets ex-US Small Cap AlphaDEX Fund S000036654 [Member] C000112036 [Member] Nasdaq AlphaDEX® Developed Markets Ex-US Small Cap™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Developed Markets Ex-US Small Cap™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI World ex-USA Index (reflects no deduction for fees, expenses or taxes)[Member] Market Capitalization Deviation Risk [Member] First Trust Emerging Markets AlphaDEX Fund S000031795 [Member] C000099049 [Member] Nasdaq AlphaDEX® Emerging Markets™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Emerging Markets™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)[Member] First Trust Emerging Markets Small Cap AlphaDEX Fund S000036655 [Member] C000112037 [Member] Nasdaq AlphaDEX® Emerging Markets Small Cap™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Emerging Markets Small Cap™ Index (reflects no deduction for fees, expenses or taxes)[Member] China A Share Investment Risk [Member] First Trust Europe AlphaDEX Fund S000031796 [Member] C000099050 [Member] Nasdaq AlphaDEX® Europe™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Developed Markets Europe™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI Europe Index (reflects no deduction for fees, expenses or taxes)[Member] United Kingdom Risk [Member] First Trust Eurozone AlphaDEX ETF S000047035 [Member] C000147004 [Member] Nasdaq AlphaDEX® Eurozone™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Eurozone™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI EMU Index (reflects no deduction for fees, expenses or taxes)[Member] Germany Risk [Member] First Trust Germany AlphaDEX Fund S000036503 [Member] C000111808 [Member] Nasdaq AlphaDEX® Germany™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Germany™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI Germany Index (reflects no deduction for fees, expenses or taxes)[Member] First Trust India NIFTY 50 Equal Weight ETF S000036506 [Member] C000111811 [Member] NIFTY 50 Equal Weight Index (reflects no deduction for fees, expenses or taxes)[Member] NIFTY 50 Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI India Index (reflects no deduction for fees, expenses or taxes)[Member] India Regulatory Risk [Member] India Risk [Member] Tax Risk [Member] First Trust Japan AlphaDEX Fund S000031800 [Member] C000099054 [Member] Nasdaq AlphaDEX® Japan™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Japan™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI Japan Index (reflects no deduction for fees, expenses or taxes)[Member] First Trust Latin America AlphaDEX Fund S000031797 [Member] C000099051 [Member] Nasdaq AlphaDEX® Latin America™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Latin America™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI EM Latin America Index (reflects no deduction for fees, expenses or taxes)[Member] Brazil Risk [Member] Latin America Risk [Member] First Trust Switzerland AlphaDEX Fund S000036505 [Member] C000111810 [Member] Nasdaq AlphaDEX® Switzerland™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq Switzerland™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI Switzerland Index (reflects no deduction for fees, expenses or taxes)[Member] Health Care Companies Risk [Member] Switzerland Risk [Member] First Trust United Kingdom AlphaDEX Fund S000036507 [Member] C000111812 [Member] Nasdaq AlphaDEX® United Kingdom™ Index (reflects no deduction for fees, expenses or taxes)[Member] Nasdaq United Kingdom™ Index (reflects no deduction for fees, expenses or taxes)[Member] MSCI United Kingdom Index (reflects no deduction for fees, expenses or taxes)[Member]