Government Securities Fund Investment Strategy - Government Securities Fund	May 31, 2026
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Principal Investment Strategies of the Fund</span>
Strategy Narrative [Text Block]	The Fund invests at least 80% of net assets in intermediate- and long-term U.S. Government and government-sponsored debt securities.The Fund may also invest in mortgage-backed securities, asset-backed securities, repurchase agreements, high quality corporate debt securities and high quality domestic money market securities. In addition, the Fund may invest up to 20% of its net assets in high quality foreign investments payable in U.S. dollars. The Fund has flexibility to invest in derivatives, including futures contracts, options, and swaps, in order to hedge various investments, for risk management purposes and/or to increase income or gain to the Fund. Derivatives, which are instruments which have a value based on another instrument, exchange rate or index, may also be used as substitutes for securities in which the Fund can invest. In particular, the Fund may use futures contracts, including treasury futures, options and swaps to manage cash inflows and duration and as substitutes for securities in which the Fund may invest. In order to generate additional income, the Fund may lend portfolio securities to broker-dealers and other financial institutions provided that the value of the loaned securities does not exceed 30% of the Fund’s total assets. These loans earn income for the Fund and are collateralized by cash and securities issued or guaranteed by the U.S. Government or its agencies or instrumentalities.

Government Securities Fund Investment Strategy - Government Securities Fund

May 31, 2026

<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Principal Investment Strategies of the Fund</span>

Strategy Narrative [Text Block]

The Fund invests at least 80% of net assets in intermediate- and long-term U.S. Government and government-sponsored debt securities.The Fund may also invest in mortgage-backed securities, asset-backed securities, repurchase agreements, high quality corporate debt securities and high quality domestic money market securities. In addition, the Fund may invest up to 20% of its net assets in high quality foreign investments payable in U.S. dollars. The Fund has flexibility to invest in derivatives, including futures contracts, options, and swaps, in order to hedge various investments, for risk management purposes and/or to increase income or gain to the Fund. Derivatives, which are instruments which have a value based on another instrument, exchange rate or index, may also be used as substitutes for securities in which the Fund can invest. In particular, the Fund may use futures contracts, including treasury futures, options and swaps to manage cash inflows and duration and as substitutes for securities in which the Fund may invest. In order to generate additional income, the Fund may lend portfolio securities to broker-dealers and other financial institutions provided that the value of the loaned securities does not exceed 30% of the Fund’s total assets. These loans earn income for the Fund and are collateralized by cash and securities issued or guaranteed by the U.S. Government or its agencies or instrumentalities.