v3.26.1
Expense Example - Future of Energy Fund
Nov. 30, 2025
USD ($)
A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 127
Expense Example, with Redemption, 3 Years 454
Expense Example, with Redemption, 5 Years 813
Expense Example, with Redemption, 10 Years 1,823
C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 193
Expense Example, with Redemption, 3 Years 654
Expense Example, with Redemption, 5 Years 1,149
Expense Example, with Redemption, 10 Years 2,514
F  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 345
Expense Example, with Redemption, 5 Years 627
Expense Example, with Redemption, 10 Years 1,431
I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 358
Expense Example, with Redemption, 5 Years 656
Expense Example, with Redemption, 10 Years 1,503
R  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 143
Expense Example, with Redemption, 3 Years 501
Expense Example, with Redemption, 5 Years 891
Expense Example, with Redemption, 10 Years 1,987
Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 345
Expense Example, with Redemption, 5 Years 627
Expense Example, with Redemption, 10 Years $ 1,431