Government Securities Fund Expense Example - Government Securities Fund - None	May 31, 2026 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 57
Expense Example, with Redemption, 3 Years	203
Expense Example, with Redemption, 5 Years	362
Expense Example, with Redemption, 10 Years	$ 824

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