v3.26.1
S000010793 [Member] Expense Example - S000010793 [Member]
Feb. 28, 2026
USD ($)
C000122580 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 77
Expense Example, with Redemption, 3 Years 274
Expense Example, with Redemption, 5 Years 488
Expense Example, with Redemption, 10 Years 1,105
C000029858 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 148
Expense Example, with Redemption, 3 Years 495
Expense Example, with Redemption, 5 Years 865
Expense Example, with Redemption, 10 Years 1,908
C000253705 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 339
Expense Example, with Redemption, 5 Years 600
Expense Example, with Redemption, 10 Years 1,348
C000029855 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 690
Expense Example, with Redemption, 3 Years 968
Expense Example, with Redemption, 5 Years 1,267
Expense Example, with Redemption, 10 Years 2,113
C000029859 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 339
Expense Example, with Redemption, 5 Years 600
Expense Example, with Redemption, 10 Years 1,348
C000122579 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 82
Expense Example, with Redemption, 3 Years 288
Expense Example, with Redemption, 5 Years 511
Expense Example, with Redemption, 10 Years $ 1,153