v3.25.2
Average Annual Total Returns
 12 Months Ended 60 Months Ended 64 Months Ended
Oct. 31, 2024
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2023
Innovator U.S. Equity Buffer ETF - July        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   18.87% 10.01% 9.23%
Performance Inception Date Aug. 28, 2018      
Innovator U.S. Equity Buffer ETF - July | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Average Annual Return, Percent   18.87% 10.01% 9.23%
Innovator U.S. Equity Buffer ETF - July | 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   11.17% 7.95% 7.39%
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   25.02% 14.53% 13.69%
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   23.31% 12.73% 11.81%