v3.26.1
S000010789 [Member] Expense Example - S000010789 [Member]
Feb. 28, 2026
USD ($)
C000122575 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 82
Expense Example, with Redemption, 3 Years 268
Expense Example, with Redemption, 5 Years 471
Expense Example, with Redemption, 10 Years 1,055
C000149202 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 253
Expense Example, with Redemption, 5 Years 444
Expense Example, with Redemption, 10 Years 996
C000253703 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 86
Expense Example, with Redemption, 3 Years 281
Expense Example, with Redemption, 5 Years 493
Expense Example, with Redemption, 10 Years 1,102
C000029837 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 680
Expense Example, with Redemption, 3 Years 914
Expense Example, with Redemption, 5 Years 1,166
Expense Example, with Redemption, 10 Years 1,887
C000029839 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 287
Expense Example, with Redemption, 3 Years 591
Expense Example, with Redemption, 5 Years 1,021
Expense Example, with Redemption, 10 Years 2,022
C000029840 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 86
Expense Example, with Redemption, 3 Years 281
Expense Example, with Redemption, 5 Years 493
Expense Example, with Redemption, 10 Years $ 1,102