S000010827 [Member] Expense Example - S000010827 [Member]	Feb. 28, 2026 USD ($)
C000030056 [Member]
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 46
Expense Example, with Redemption, 3 Years	144
Expense Example, with Redemption, 5 Years	252
Expense Example, with Redemption, 10 Years	567
C000030057 [Member]
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	20
Expense Example, with Redemption, 3 Years	64
Expense Example, with Redemption, 5 Years	113
Expense Example, with Redemption, 10 Years	255
C000122595 [Member]
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	20
Expense Example, with Redemption, 3 Years	64
Expense Example, with Redemption, 5 Years	113
Expense Example, with Redemption, 10 Years	255
C000173201 [Member]
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	20
Expense Example, with Redemption, 3 Years	64
Expense Example, with Redemption, 5 Years	113
Expense Example, with Redemption, 10 Years	$ 255

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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