v3.26.3
Average Annual Total Returns
 12 Months Ended 39 Months Ended
Oct. 31, 2025
Dec. 31, 2024
Dec. 31, 2024
Innovator International Developed Power Buffer ETF - October      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] Return Before Taxes    
Average Annual Return, Percent   18.79% 8.16%
Performance Inception Date Sep. 30, 2021    
Innovator International Developed Power 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   18.79% 8.16%
Innovator International Developed Power 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   11.12% 6.40%
MSCI EAFE Total Return Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] MSCI EAFE Total Return Index (reflects no deduction for fees, expenses or taxes)    
Average Annual Return, Percent   31.22% 8.51%
MSCI EAFE Price Return Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] MSCI EAFE Price Return Index (reflects no deduction for fees, expenses or taxes)    
Average Annual Return, Percent   27.89% 5.74%