v3.26.1
Expense Example - Gateway Trust - Classes A, C, N, and Y
Dec. 31, 2025
USD ($)
Gateway Equity Call Premium Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 664
Expense Example, with Redemption, 3 Years 879
Expense Example, with Redemption, 5 Years 1,110
Expense Example, with Redemption, 10 Years 1,774
Gateway Equity Call Premium Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 271
Expense Example, with Redemption, 3 Years 555
Expense Example, with Redemption, 5 Years 964
Expense Example, with Redemption, 10 Years 1,909
Gateway Equity Call Premium Fund | N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 64
Expense Example, with Redemption, 3 Years 297
Expense Example, with Redemption, 5 Years 547
Expense Example, with Redemption, 10 Years 1,266
Gateway Equity Call Premium Fund | Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 69
Expense Example, with Redemption, 3 Years 243
Expense Example, with Redemption, 5 Years 432
Expense Example, with Redemption, 10 Years 979
Gateway Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 665
Expense Example, with Redemption, 3 Years 863
Expense Example, with Redemption, 5 Years 1,078
Expense Example, with Redemption, 10 Years 1,694
Gateway Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 273
Expense Example, with Redemption, 3 Years 542
Expense Example, with Redemption, 5 Years 936
Expense Example, with Redemption, 10 Years 1,837
Gateway Fund | N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 66
Expense Example, with Redemption, 3 Years 208
Expense Example, with Redemption, 5 Years 362
Expense Example, with Redemption, 10 Years 810
Gateway Fund | Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 72
Expense Example, with Redemption, 3 Years 230
Expense Example, with Redemption, 5 Years 403
Expense Example, with Redemption, 10 Years $ 904