FT Vest Autocallable Barrier & High Income ETF S000101121 [Member] FT Vest Autocallable Barrier & High Income ETF C000271152 [Member] Absence Of An Active Market Risk [Member] Authorized Participant Concentration Risk [Member] Autocallable Yield Notes Risk [Member] Barrier Risk [Member] Box Spread Risk [Member] Cash Transactions Risk [Member] Communication Services Companies Risk [Member] Consumer Discretionary Companies Risk [Member] Counterparty Risk [Member] Credit Risk [Member] Current Market Conditions Risk [Member] Cyber Security Risk [Member] Derivatives Risk [Member] Distribution Tax Risk [Member] Equity Securities Risk [Member] Growth Stocks Investment Risk [Member] Health Care Companies Risk [Member] Index Or Model Constituent Risk [Member] Inflation Risk [Member] Information Technology Companies Risk [Member] Interest Rate Risk [Member] Large Capitalization Companies 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] Premium Discount Risk [Member] Significant Exposure Risk [Member] Special Tax Risk [Member] Swap Agreements Risk [Member] Swap RIC Tax Risk [Member] Trading Issues Risk [Member] US Government Securities Risk [Member] Valuation Risk [Member] Volatility Risk [Member]