v3.26.3
Average Annual Total Returns
 12 Months Ended 60 Months Ended 75 Months Ended
Oct. 31, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Innovator U.S. Equity Buffer ETF - October        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   14.23% 10.45% 10.19%
Performance Inception Date Sep. 28, 2018      
Innovator U.S. Equity Buffer ETF - October | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Average Annual Return, Percent   14.23% 10.45% 10.18%
Innovator U.S. Equity Buffer ETF - October | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Average Annual Return, Percent   8.42% 8.31% 8.25%
S&P 500® Total Return Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] S&P 500® Total Return Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   17.88% 14.42% 14.32%
S&P 500® Price Return Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] S&P 500® Price Return Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   16.39% 12.75% 12.49%