FT Vest Bitcoin Strategy Floor15 ETF - April S000090189 [Member] C000257115 [Member] Absence Of An Active Market Risk [Member] Authorized Participant Concentration Risk [Member] Bitcoin Reference Instrument Risk [Member] Bitcoin Risk [Member] Box Spread Risk [Member] Call Options Risk [Member] Cap Change Risk [Member] Capped Upside Risk [Member] Cash Transactions Risk [Member] Counterparty Risk [Member] Credit Risk [Member] Current Market Conditions Risk [Member] Cyber Security Risk [Member] Debt Securities Risk [Member] Derivatives Risk [Member] Digital Asset Industry Risk [Member] Digital Asset Regulatory Risk [Member] Flex Options Risk [Member] Floor 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 Risk [Member] New Fund Risk [Member] Risk Nondiversified [Member] Operational Risk [Member] Options Risk [Member] Options Valuation Risk [Member] OTC Derivatives Risk [Member] Premium Discount Risk [Member] Put Options Risk [Member] Significant Exposure Risk [Member] Special Tax Risk [Member] Target Outcome Period Risk [Member] Trading Issues Risk [Member] US Government Securities Risk [Member]