v3.26.1
S000010792 [Member] Expense Example - S000010792 [Member]
Feb. 28, 2026
USD ($)
C000122577 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 82
Expense Example, with Redemption, 3 Years 255
Expense Example, with Redemption, 5 Years 444
Expense Example, with Redemption, 10 Years 990
C000253704 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 90
Expense Example, with Redemption, 3 Years 281
Expense Example, with Redemption, 5 Years 488
Expense Example, with Redemption, 10 Years 1,084
C000029850 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 684
Expense Example, with Redemption, 3 Years 913
Expense Example, with Redemption, 5 Years 1,161
Expense Example, with Redemption, 10 Years 1,871
C000029852 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 291
Expense Example, with Redemption, 3 Years 591
Expense Example, with Redemption, 5 Years 1,016
Expense Example, with Redemption, 10 Years 2,005
C000029853 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 141
Expense Example, with Redemption, 3 Years 437
Expense Example, with Redemption, 5 Years 755
Expense Example, with Redemption, 10 Years 1,657
C000029854 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 90
Expense Example, with Redemption, 3 Years 281
Expense Example, with Redemption, 5 Years 488
Expense Example, with Redemption, 10 Years 1,084
C000079026 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 240
Expense Example, with Redemption, 5 Years 417
Expense Example, with Redemption, 10 Years $ 930