v3.26.1
S000010797 [Member] Expense Example - S000010797 [Member]
Feb. 28, 2026
USD ($)
C000175686 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 128
Expense Example, with Redemption, 3 Years 423
Expense Example, with Redemption, 5 Years 739
Expense Example, with Redemption, 10 Years 1,637
C000253707 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 78
Expense Example, with Redemption, 3 Years 267
Expense Example, with Redemption, 5 Years 471
Expense Example, with Redemption, 10 Years 1,062
C000029874 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 672
Expense Example, with Redemption, 3 Years 900
Expense Example, with Redemption, 5 Years 1,146
Expense Example, with Redemption, 10 Years 1,851
C000029877 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 78
Expense Example, with Redemption, 3 Years 267
Expense Example, with Redemption, 5 Years 471
Expense Example, with Redemption, 10 Years 1,062
C000136868 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 72
Expense Example, with Redemption, 3 Years 248
Expense Example, with Redemption, 5 Years 439
Expense Example, with Redemption, 10 Years 991
C000171353 [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 67
Expense Example, with Redemption, 3 Years 235
Expense Example, with Redemption, 5 Years 417
Expense Example, with Redemption, 10 Years $ 944