Innovator U.S. Equity Accelerated 9 Buffer ETF - April Innovator U.S. Equity Accelerated 9 Buffer ETF - April Defined Outcome Strategy Risk [Member] Derivatives Risk [Member] Underlying ETF Risk [Member] Concentration Risk [Member] Cyber Security Risk [Member] Market Risk [Member] Risks Associated with ETFs [Member] Tax Risk [Member] Valuation Risk [Member] S&P 500® Total Return Index (reflects no deduction for fees, expenses or taxes) S&P 500® Price Return Index (reflects no deduction for fees, expenses or taxes) Market Risk Member S000070748 Member Valuation Risk Member C000224890 Member Defined Outcome Strategy Risk Member Derivatives Risk Member Tax Risk Member Cyber Security Risk Member Underlying ETFRisk Member Risks Associated With ETFs Member index_ SP_500_ Total_ Return_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Concentration Risk Member index_ SP_500_ Price_ Return_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member