FT Vest Silver Strategy & Target Income ETF S000105999 [Member] FT Vest Silver Strategy & Target Income ETF C000276821 [Member] Absence Of An Active Market Risk [Member] Authorized Participant Concentration Risk [Member] Box Spread Risk [Member] Call Options Risk [Member] Cash Transactions Risk [Member] Commodities Risk [Member] Counterparty Risk [Member] Covered Call Strategy Risk [Member] Credit Risk [Member] Current Market Conditions Risk [Member] Cyber Security Risk [Member] Debt Securities Risk [Member] Derivatives Risk [Member] Distribution Tax Risk [Member] Flex Options Risk [Member] Income Risk [Member] Index Or Model Constituent Risk [Member] Inflation Risk [Member] Interest Rate Risk [Member] Leverage Risk [Member] Liquidity Risk [Member] Management Risk [Member] Market Maker Risk [Member] Market Risk [Member] New Fund Risk [Member] Risk Nondiversified [Member] Operational Risk [Member] Options Risk [Member] Options Valuation Risk [Member] Portfolio Turnover Risk [Member] Premium Discount Risk [Member] Put Options Risk [Member] Significant Exposure Risk [Member] Underlying ETF Silver Risk [Member] Special Tax Risk [Member] Trading Issues Risk [Member] Underlying ETF Concentration Risk [Member] Underlying ETF Risk [Member] US Government Securities Risk [Member] Valuation Risk [Member]