v3.26.3
S000012079 [Member] Expense Example, No Redemption - S000012079 [Member]
May 31, 2026
USD ($)
C000122670 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 59
Expense Example, No Redemption, 3 Years 186
Expense Example, No Redemption, 5 Years 324
Expense Example, No Redemption, 10 Years 726
C000122671 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 54
Expense Example, No Redemption, 3 Years 170
Expense Example, No Redemption, 5 Years 296
Expense Example, No Redemption, 10 Years 665
C000255599 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 65
Expense Example, No Redemption, 3 Years 205
Expense Example, No Redemption, 5 Years 357
Expense Example, No Redemption, 10 Years 798
C000032900 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 661
Expense Example, No Redemption, 3 Years 843
Expense Example, No Redemption, 5 Years 1,040
Expense Example, No Redemption, 10 Years 1,608
C000032902 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 167
Expense Example, No Redemption, 3 Years 517
Expense Example, No Redemption, 5 Years 892
Expense Example, No Redemption, 10 Years 1,743
C000032905 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 65
Expense Example, No Redemption, 3 Years 205
Expense Example, No Redemption, 5 Years 357
Expense Example, No Redemption, 10 Years 798
C000061836 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 116
Expense Example, No Redemption, 3 Years 362
Expense Example, No Redemption, 5 Years 628
Expense Example, No Redemption, 10 Years $ 1,386