v3.26.3
Average Annual Total Returns
 6 Months Ended 12 Months Ended
Oct. 31, 2025
Dec. 31, 2024
Dec. 31, 2024
Innovator U.S. Small Cap 10 Buffer ETF - Quarterly      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] Return Before Taxes    
Average Annual Return, Percent   10.24% 11.43%
Performance Inception Date Jun. 28, 2024    
Innovator U.S. Small Cap 10 Buffer ETF - Quarterly | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions    
Average Annual Return, Percent   10.24% 11.43%
Innovator U.S. Small Cap 10 Buffer ETF - Quarterly | 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   7.85% 6.77%
Russell 2000 Total Return Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] Russell 2000 Total Return Index (reflects no deduction for fees, expenses or taxes)    
Average Annual Return, Percent   15.12% 12.81%
Russell 2000 Price Return Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] Russell 2000 Price Return Index (reflects no deduction for fees, expenses or taxes)    
Average Annual Return, Percent   13.59% 11.29%