v3.26.1
S000010826 [Member] Expense Example, No Redemption - S000010826 [Member]
Feb. 28, 2026
USD ($)
C000030054 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 46
Expense Example, No Redemption, 3 Years 175
Expense Example, No Redemption, 5 Years 315
Expense Example, No Redemption, 10 Years 725
C000030055 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 20
Expense Example, No Redemption, 3 Years 95
Expense Example, No Redemption, 5 Years 177
Expense Example, No Redemption, 10 Years 417
C000122594 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 20
Expense Example, No Redemption, 3 Years 82
Expense Example, No Redemption, 5 Years 149
Expense Example, No Redemption, 10 Years 348
C000173200 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 20
Expense Example, No Redemption, 3 Years 69
Expense Example, No Redemption, 5 Years 122
Expense Example, No Redemption, 10 Years $ 278