Mid Cap Value Fund Investment Strategy - Mid Cap Value 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, under normal circumstances, at least 80% of net assets in securities of mid-cap value companies.For purposes of the Fund’s 80% investment policy, a company is considered to be a value company if it: (i) issues securities that are represented in a third-party value-style index or that are classified as a value company by a third-party vendor; or (ii) meets a relevant equity market measurement in at least one “value metric” similar to those commonly used by third-party index providers or third-party vendors in value classifications, such as earnings growth, price-to-earnings or sales growth, among others. Generally, mid-cap companies will include companies whose market capitalizations, at the time of purchase, range from the market capitalization of the smallest company included in the Russell Midcap® Index to the market capitalization of the largest company in the Russell Midcap® Index during the most recent 12-month period. As of August 31, 2026, the median stock by market capitalization in the Index was approximately $13.370 million, and the largest stock was approximately $114.575 billion. The size of the companies in the Index changes with market conditions and the composition of the Index. The Fund invests primarily in equity securities. The subadvisers use value-oriented investment approaches to identify companies in which to invest the Fund’s assets. Within the universe of value companies, the subadvisers generally select stocks that they believe meet one or more of the following criteria: (1) are undervalued relative to other securities in the same industry or market, (2) exhibit good or improving fundamentals, or (3) exhibit an identifiable catalyst (e.g., an event or company report that significantly affects the price of a security, such as an earnings report, new product launch, new legislation, or lawsuit) that could close the gap between market value and fair value over the next one to two years. The Fund may invest up to 20% of its total assets in foreign securities. The Fund may also invest in depositary receipts, which are instruments issued by a bank that represent an interest in a foreign issuer’s securities. 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.

Mid Cap Value Fund Investment Strategy - Mid Cap Value 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, under normal circumstances, at least 80% of net assets in securities of mid-cap value companies.For purposes of the Fund’s 80% investment policy, a company is considered to be a value company if it: (i) issues securities that are represented in a third-party value-style index or that are classified as a value company by a third-party vendor; or (ii) meets a relevant equity market measurement in at least one “value metric” similar to those commonly used by third-party index providers or third-party vendors in value classifications, such as earnings growth, price-to-earnings or sales growth, among others. Generally, mid-cap companies will include companies whose market capitalizations, at the time of purchase, range from the market capitalization of the smallest company included in the Russell Midcap® Index to the market capitalization of the largest company in the Russell Midcap® Index during the most recent 12-month period. As of August 31, 2026, the median stock by market capitalization in the Index was approximately $13.370 million, and the largest stock was approximately $114.575 billion. The size of the companies in the Index changes with market conditions and the composition of the Index. The Fund invests primarily in equity securities. The subadvisers use value-oriented investment approaches to identify companies in which to invest the Fund’s assets. Within the universe of value companies, the subadvisers generally select stocks that they believe meet one or more of the following criteria: (1) are undervalued relative to other securities in the same industry or market, (2) exhibit good or improving fundamentals, or (3) exhibit an identifiable catalyst (e.g., an event or company report that significantly affects the price of a security, such as an earnings report, new product launch, new legislation, or lawsuit) that could close the gap between market value and fair value over the next one to two years. The Fund may invest up to 20% of its total assets in foreign securities. The Fund may also invest in depositary receipts, which are instruments issued by a bank that represent an interest in a foreign issuer’s securities. 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.