v3.26.1
S000010825 [Member] Expense Example, No Redemption - S000010825 [Member]
Feb. 28, 2026
USD ($)
C000030051 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 46
Expense Example, No Redemption, 3 Years 144
Expense Example, No Redemption, 5 Years 252
Expense Example, No Redemption, 10 Years 567
C000030053 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 20
Expense Example, No Redemption, 3 Years 64
Expense Example, No Redemption, 5 Years 113
Expense Example, No Redemption, 10 Years 255
C000122593 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 20
Expense Example, No Redemption, 3 Years 64
Expense Example, No Redemption, 5 Years 113
Expense Example, No Redemption, 10 Years 255
C000173199 [Member]  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 20
Expense Example, No Redemption, 3 Years 64
Expense Example, No Redemption, 5 Years 113
Expense Example, No Redemption, 10 Years $ 255