Innovator U.S. Equity Accelerated 9 Buffer ETF — October Innovator U.S. Equity Accelerated 9 Buffer ETF - October 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 C000230742 Member Valuation Risk Member Defined Outcome Strategy Risk Member Derivatives Risk Member Tax Risk Member Cyber Security Risk Member S000073670 Member Underlying ETFRisks Member Risks Associated With ETFs Member index_ SP_500_ Total_ Return_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Concentration Risks Member index_ SP_500_ Price_ Return_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member