Innovator U.S. Small Cap Power Buffer ETF - October Innovator U.S. Small Cap Power 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] Non-Diversification Risk [Member] Risks Associated with ETFs [Member] Tax Risk [Member] Valuation Risk [Member] Russell 2000 Total Return Index (reflects no deduction for fees, expenses or taxes) Russell 2000 Price Return Index (reflects no deduction for fees, expenses or taxes) Market Risk Member Non Diversification Risk Member Valuation Risk Member index_ Russell_2000_ Price_ Return_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Defined Outcome Strategy Risk Member Derivatives Risk Member S000065317 Member Tax Risk Member Cyber Security Risk Member index_ Russell_2000_ Total_ Return_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member C000211375 Member Underlying ETFRisk Member Risks Associated With ETFs Member Concentration Risk Member