v3.26.3
Average Annual Total Returns
 12 Months Ended 60 Months Ended 63 Months Ended
Oct. 31, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Innovator U.S. Small Cap Power Buffer ETF - October        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   10.43% 5.41% 5.49%
Performance Inception Date Sep. 30, 2019      
Innovator U.S. Small Cap 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   10.43% 5.41% 5.44%
Innovator U.S. Small Cap 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   6.17% 4.22% 4.29%
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   12.81% 6.09% 9.59%
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   11.29% 4.68% 8.12%