v3.26.1
Average Annual Total Returns
 12 Months Ended 45 Months Ended
Oct. 31, 2025
Dec. 31, 2024
Dec. 31, 2024
Innovator International Developed Power Buffer ETF - April      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] Return Before Taxes    
Average Annual Return, Percent   15.39% 4.60%
Performance Inception Date Mar. 31, 2021    
Innovator International Developed Power Buffer ETF - April | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions    
Average Annual Return, Percent   15.39% 4.60%
Innovator International Developed Power Buffer ETF - April | 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   9.11% 3.58%
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% 8.62%
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% 5.84%