v3.25.4
Average Annual Total Returns
 12 Months Ended 56 Months Ended 58 Months Ended 59 Months Ended 60 Months Ended 61 Months Ended 62 Months Ended 64 Months Ended 65 Months Ended 67 Months Ended 69 Months Ended 72 Months Ended 75 Months Ended 76 Months Ended 77 Months Ended
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Innovator U.S. Equity Buffer ETF - January                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   14.79%       10.95%             12.61%      
Performance Inception Date Dec. 31, 2018                              
Innovator U.S. Equity Buffer ETF - January | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   14.79%       10.95%             12.31%      
Innovator U.S. Equity Buffer ETF - January | 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   8.76%       8.73%             10.12%      
Innovator U.S. Equity Power Buffer ETF - January                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.28%       8.99%             9.38%      
Performance Inception Date Dec. 31, 2018                              
Innovator U.S. Equity Power Buffer ETF - January | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.28%       8.99%             9.38%      
Innovator U.S. Equity Power Buffer ETF - January | 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   6.68%       7.12%             7.56%      
Innovator U.S. Equity Ultra Buffer ETF - January                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.07%       7.72%             8.09%      
Performance Inception Date Dec. 31, 2018                              
Innovator U.S. Equity Ultra Buffer ETF - January | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.07%       7.72%             8.09%      
Innovator U.S. Equity Ultra Buffer ETF - January | 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   6.55%       6.08%             6.48%      
Innovator U.S. Equity Buffer ETF - February                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   12.89%     12.28% 12.33%                    
Performance Inception Date Jan. 31, 2020                              
Innovator U.S. Equity Buffer ETF - February | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   12.89%     12.28% 12.33%                    
Innovator U.S. Equity Buffer ETF - February | 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   7.63%     9.92% 9.87%                    
Innovator U.S. Equity Power Buffer ETF - February                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   10.52%     8.96% 9.16%                    
Performance Inception Date Jan. 31, 2020                              
Innovator U.S. Equity Power Buffer ETF - February | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   10.52%     8.96% 9.16%                    
Innovator U.S. Equity Power Buffer ETF - February | 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   6.23%     7.14% 7.25%                    
Innovator U.S. Equity Ultra Buffer ETF - February                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   10.44%     7.09% 7.13%                    
Performance Inception Date Jan. 31, 2020                              
Innovator U.S. Equity Ultra Buffer ETF - February | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   10.44%     7.09% 7.13%                    
Innovator U.S. Equity Ultra Buffer ETF - February | 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   6.18%     5.60% 5.60%                    
Innovator U.S. Equity Buffer ETF - March                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   14.88%   12.98%   12.30%                    
Performance Inception Date Feb. 28, 2020                              
Innovator U.S. Equity Buffer ETF - March | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   14.88%   12.98%   12.30%                    
Innovator U.S. Equity Buffer ETF - March | 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   8.81%   10.51%   9.84%                    
Innovator U.S. Equity Power Buffer ETF - March                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.91%   9.82%   9.53%                    
Performance Inception Date Feb. 28, 2020                              
Innovator U.S. Equity Power Buffer ETF - March | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.91%   9.82%   9.53%                    
Innovator U.S. Equity Power Buffer ETF - March | 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   7.05%   7.85%   7.55%                    
Innovator U.S. Equity Ultra Buffer ETF - March                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.80%   7.62%   7.53%                    
Performance Inception Date Feb. 28, 2020                              
Innovator U.S. Equity Ultra Buffer ETF - March | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.80%   7.62%   7.53%                    
Innovator U.S. Equity Ultra Buffer ETF - March | 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   6.99%   6.04%   5.93%                    
Innovator U.S. Equity Buffer ETF - April                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   8.15%       10.06%           10.17%        
Performance Inception Date Mar. 29, 2019                              
Innovator U.S. Equity 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   8.15%       10.06%           10.17%        
Innovator U.S. Equity 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   4.82%       7.99%           8.21%        
Innovator U.S. Equity Power Buffer ETF - April                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   6.56%       7.44%           7.38%        
Performance Inception Date Mar. 29, 2019                              
Innovator U.S. Equity 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   6.56%       7.44%           7.21%        
Innovator U.S. Equity 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   3.88%       5.85%           5.79%        
Innovator U.S. Equity Ultra Buffer ETF - April                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   6.18%       5.59%           4.47%        
Performance Inception Date Mar. 29, 2019                              
Innovator U.S. Equity Ultra 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   6.18%       5.59%           4.35%        
Innovator U.S. Equity Ultra 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   3.66%       4.36%           3.45%        
Innovator U.S. Equity Buffer ETF - May                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.05% 10.36%     8.61%                    
Performance Inception Date Apr. 30, 2020                              
Innovator U.S. Equity Buffer ETF - May | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.05% 10.36%     8.61%                    
Innovator U.S. Equity Buffer ETF - May | 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   6.54% 8.29%     6.81%                    
Innovator U.S. Equity Power Buffer ETF - May                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   10.22% 7.98%     6.85%                    
Performance Inception Date Apr. 30, 2020                              
Innovator U.S. Equity Power Buffer ETF - May | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   10.22% 7.98%     6.85%                    
Innovator U.S. Equity Power Buffer ETF - May | 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   6.05% 6.32%     5.37%                    
Innovator U.S. Equity Ultra Buffer ETF - May                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   8.58% 6.46%     5.98%                    
Performance Inception Date Apr. 30, 2020                              
Innovator U.S. Equity Ultra Buffer ETF - May | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   8.58% 6.46%     5.98%                    
Innovator U.S. Equity Ultra Buffer ETF - May | 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   5.08% 5.08%     4.68%                    
Innovator U.S. Equity Buffer ETF - June                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   12.51%       8.45%         9.77%          
Performance Inception Date May 31, 2019                              
Innovator U.S. Equity Buffer ETF - June | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   12.51%       8.45%         9.77%          
Innovator U.S. Equity Buffer ETF - June | 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   7.41%       6.67%         7.86%          
Innovator U.S. Equity Power Buffer ETF - June                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.54%       6.81%         7.95%          
Performance Inception Date May 31, 2019                              
Innovator U.S. Equity Power Buffer ETF - June | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.54%       6.81%         7.95%          
Innovator U.S. Equity Power Buffer ETF - June | 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   6.83%       5.34%         6.34%          
Innovator U.S. Equity Ultra Buffer ETF - June                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   10.47%       5.93%         6.72%          
Performance Inception Date May 31, 2019                              
Innovator U.S. Equity Ultra Buffer ETF - June | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   10.47%       5.93%         6.53%          
Innovator U.S. Equity Ultra Buffer ETF - June | 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   6.20%       4.64%         5.24%          
Innovator U.S. Equity Buffer ETF - July                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   13.76%       11.04%                 9.83%  
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   13.76%       11.04%                 9.83%  
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   8.15%       8.79%                 7.96%  
Innovator U.S. Equity Power Buffer ETF - July                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   12.83%       10.02%                   8.76%
Performance Inception Date Aug. 07, 2018                              
Innovator U.S. Equity Power 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   12.83%       10.02%                   8.71%
Innovator U.S. Equity Power 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   7.59%       7.95%                   7.03%
Innovator U.S. Equity Ultra Buffer ETF - July                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   12.29%       7.98%                   6.93%
Performance Inception Date Aug. 07, 2018                              
Innovator U.S. Equity Ultra 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   12.29%       7.98%                   6.62%
Innovator U.S. Equity Ultra 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   7.27%       6.29%                   5.37%
Innovator U.S. Equity Buffer ETF - August                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   14.72%       10.95%       11.40%            
Performance Inception Date Jul. 31, 2019                              
Innovator U.S. Equity Buffer ETF - August | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   14.72%       10.95%       11.40%            
Innovator U.S. Equity Buffer ETF - August | 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   8.71%       8.72%       9.22%            
Innovator U.S. Equity Power Buffer ETF - August                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   12.28%       8.86%       9.13%            
Performance Inception Date Jul. 31, 2019                              
Innovator U.S. Equity Power Buffer ETF - August | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   12.28%       8.86%       9.05%            
Innovator U.S. Equity Power Buffer ETF - August | 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   7.27%       7.00%       7.27%            
Innovator U.S. Equity Ultra Buffer ETF - August                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   12.34%       7.48%       7.69%            
Performance Inception Date Jul. 31, 2019                              
Innovator U.S. Equity Ultra Buffer ETF - August | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   12.34%       7.48%       7.64%            
Innovator U.S. Equity Ultra Buffer ETF - August | 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   7.31%       5.89%       6.09%            
Innovator U.S. Equity Buffer ETF - September                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   14.75%       11.08%     11.86%              
Performance Inception Date Aug. 30, 2019                              
Innovator U.S. Equity Buffer ETF - September | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   14.75%       11.08%     11.76%              
Innovator U.S. Equity Buffer ETF - September | 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   8.73%       8.83%     9.54%              
Innovator U.S. Equity Power Buffer ETF - September                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.72%       9.36%     9.50%              
Performance Inception Date Aug. 30, 2019                              
Innovator U.S. Equity Power Buffer ETF - September | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.72%       9.36%     9.50%              
Innovator U.S. Equity Power Buffer ETF - September | 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   6.94%       7.41%     7.62%              
Innovator U.S. Equity Ultra Buffer ETF - September                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   11.56%       7.73%     7.80%              
Performance Inception Date Aug. 30, 2019                              
Innovator U.S. Equity Ultra Buffer ETF - September | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   11.56%       7.73%     7.76%              
Innovator U.S. Equity Ultra Buffer ETF - September | 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   6.84%       6.09%     6.18%              
Innovator U.S. Equity Buffer ETF - October                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   14.23%       10.45%               10.19%    
Performance Inception Date Sep. 28, 2018                              
Innovator U.S. Equity 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   14.23%       10.45%               10.18%    
Innovator U.S. Equity 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   8.42%       8.31%               8.25%    
Innovator U.S. Equity Power Buffer ETF - October                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   10.94%       9.54%               8.71%    
Performance Inception Date Sep. 28, 2018                              
Innovator U.S. Equity 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   10.94%       9.54%               8.61%    
Innovator U.S. Equity 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   6.48%       7.56%               6.96%    
Innovator U.S. Equity Ultra Buffer ETF - October                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   10.48%       7.75%               6.98%    
Performance Inception Date Sep. 28, 2018                              
Innovator U.S. Equity Ultra 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   10.48%       7.75%               6.86%    
Innovator U.S. Equity Ultra 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   6.20%       6.10%               5.50%    
Innovator U.S. Equity Buffer ETF - November                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   12.96%       8.34%   9.40%                
Performance Inception Date Oct. 31, 2019                              
Innovator U.S. Equity Buffer ETF - November | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   12.96%       8.34%   9.40%                
Innovator U.S. Equity Buffer ETF - November | 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   7.67%       6.58%   7.52%                
Innovator U.S. Equity Power Buffer ETF - November                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   10.34%       7.62%   8.32%                
Performance Inception Date Oct. 31, 2019                              
Innovator U.S. Equity Power Buffer ETF - November | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   10.34%       7.62%   8.32%                
Innovator U.S. Equity Power Buffer ETF - November | 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   6.12%       6.00%   6.63%                
Innovator U.S. Equity Ultra Buffer ETF - November                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   9.71%       6.15%   6.68%                
Performance Inception Date Oct. 31, 2019                              
Innovator U.S. Equity Ultra Buffer ETF - November | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   9.71%       6.15%   6.68%                
Innovator U.S. Equity Ultra Buffer ETF - November | 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   5.75%       4.81%   5.28%                
Innovator U.S. Equity Buffer ETF - December                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   14.87%       10.13% 10.89%                  
Performance Inception Date Nov. 29, 2019                              
Innovator U.S. Equity Buffer ETF - December | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   14.87%       10.13% 10.89%                  
Innovator U.S. Equity Buffer ETF - December | 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   8.80%       8.04% 8.77%                  
Innovator U.S. Equity Power Buffer ETF - December                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   13.04%       8.43% 8.50%                  
Performance Inception Date Nov. 29, 2019                              
Innovator U.S. Equity Power Buffer ETF - December | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   13.04%       8.43% 8.50%                  
Innovator U.S. Equity Power Buffer ETF - December | 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   7.72%       6.66% 6.77%                  
Innovator U.S. Equity Ultra Buffer ETF - December                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return Before Taxes                              
Average Annual Return, Percent   13.06%       6.86% 6.90%                  
Performance Inception Date Nov. 29, 2019                              
Innovator U.S. Equity Ultra Buffer ETF - December | After Taxes on Distributions                                
Prospectus [Line Items]                                
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                              
Average Annual Return, Percent   13.06%       6.86% 6.90%                  
Innovator U.S. Equity Ultra Buffer ETF - December | 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   7.73%       5.39% 5.45%                  
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   17.88% 18.03% 17.24% 15.31% 14.42% 15.41% 15.86% 16.14% 15.63% 16.65% 15.75% 17.29% 14.32% 14.26% 14.37%
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   16.39% 16.26% 15.47% 13.56% 12.75% 13.65% 14.08% 14.35% 13.83% 14.84% 13.94% 15.43% 12.49% 12.42% 12.53%