3.24.2 html 406 71 1 true 115 0 false 2 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.ftportfolios.com/role/DocumentDocumentandEntityInformationElements Document and Entity Information Risk/Return 1 false false R2.htm 000019 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Nasdaq Bank ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustNasdaqBankETF Risk/Return Detail Data- First Trust Nasdaq Bank ETF Risk/Return 2 false false R3.htm 000029 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Nasdaq Food and Beverage ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustNasdaqFoodandBeverageETF Risk/Return Detail Data- First Trust Nasdaq Food and Beverage ETF Risk/Return 3 false false R4.htm 000039 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Nasdaq Oil and Gas ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustNasdaqOilandGasETF Risk/Return Detail Data- First Trust Nasdaq Oil and Gas ETF Risk/Return 4 false false R5.htm 000049 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Nasdaq Pharmaceuticals ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustNasdaqPharmaceuticalsETF Risk/Return Detail Data- First Trust Nasdaq Pharmaceuticals ETF Risk/Return 5 false false R6.htm 000059 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Nasdaq Semiconductor ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustNasdaqSemiconductorETF Risk/Return Detail Data- First Trust Nasdaq Semiconductor ETF Risk/Return 6 false false R7.htm 000069 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Nasdaq Transportation ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustNasdaqTransportationETF Risk/Return Detail Data- First Trust Nasdaq Transportation ETF Risk/Return 7 false false R8.htm 000079 - Disclosure - Risk/Return Detail Data {Elements} - Emerging Markets Equity Select ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsEmergingMarketsEquitySelectETF Risk/Return Detail Data- Emerging Markets Equity Select ETF Risk/Return 8 false false R9.htm 000089 - Disclosure - Risk/Return Detail Data {Elements} - Small Cap US Equity Select ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsSmallCapUSEquitySelectETF Risk/Return Detail Data- Small Cap US Equity Select ETF Risk/Return 9 false false R10.htm 000099 - Disclosure - Risk/Return Detail Data {Elements} - First Trust S-Network E-Commerce ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustS-NetworkE-CommerceETF Risk/Return Detail Data- First Trust S-Network E-Commerce ETF Risk/Return 10 false false R11.htm 000109 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Indxx Medical Devices ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustIndxxMedicalDevicesETF Risk/Return Detail Data- First Trust Indxx Medical Devices ETF Risk/Return 11 false false R12.htm 000119 - Disclosure - Risk/Return Detail Data {Elements} - First Trust S-Network Streaming and Gaming ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustS-NetworkStreamingandGamingETF Risk/Return Detail Data- First Trust S-Network Streaming and Gaming ETF Risk/Return 12 false false R13.htm 000129 - Disclosure - Risk/Return Detail Data {Elements} - First Trust Bloomberg Shareholder Yield ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustBloombergShareholderYieldETF Risk/Return Detail Data- First Trust Bloomberg Shareholder Yield ETF Risk/Return 13 false false R14.htm 000139 - Disclosure - Risk/Return Detail Data {Elements} - First Trust S&P 500 Diversified Dividend Aristocrats ETF Sheet http://www.ftportfolios.com/role/DisclosureRiskReturnDetailDataElementsFirstTrustSamp;P500DiversifiedDividendAristocratsETF Risk/Return Detail Data- First Trust S&P 500 Diversified Dividend Aristocrats ETF Risk/Return 14 false false R15.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data Risk/Return 15 false false All Reports Book All Reports ftetfvi-20240729.htm ftetfvi-20240729.xsd ftetfvi-20240729_cal.xml ftetfvi-20240729_def.xml ftetfvi-20240729_lab.xml ftetfvi-20240729_pre.xml img05cf44523.jpg img101222972.jpg img17f580c32.jpg img1a422c751.gif img1e48c4002.jpg img294b9e4c5.jpg img5ce893804.jpg img613391941.gif img8851aaed2.jpg img8c5c129a6.jpg imga09326191.gif imga8f4ef492.jpg imgc070c61b1.gif imgc71745742.jpg imgc807fa392.jpg imgd848afec1.gif imge4fd1c661.gif imge7fc12ae7.jpg imge86e352a1.gif imge8b053303.jpg http://xbrl.sec.gov/dei/2023 http://xbrl.sec.gov/rr/2023 true true