GLOBAL REAL ESTATE FUND Investment Strategy - GLOBAL REAL ESTATE 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 its net assets in a diversified portfolio of equity investments in real estate and real estate-related companies. A company is considered a “real estate company” or “real estate-related company” if at least 50% of its net assets, gross income, or net profits are attributable to ownership, development, construction, financing, management, or sale of commercial, industrial or residential real estate or interests therein.The Fund invests primarily in real estate investment trusts (“REITs”) and equity securities, including common and preferred stocks and convertible securities. The Fund’s investments in real estate and real estate-related companies may include REITs, REIT-like structures, or real estate operating companies whose businesses and services are related to the real estate industry.In complying with the 80% investment requirement, the Fund may include synthetic securities that have economic characteristics similar to the Fund’s direct investments that are counted toward the 80% investment requirement. The Fund may invest in foreign securities, including securities of issuers in emerging markets. Under normal market conditions, the Fund expects to invest at least 30% of its assets in securities of issuers from at least three countries outside of the United States. The Fund expects to invest a substantial portion of its assets in foreign securities economically tied to Japan, the United Kingdom, Australia, Hong Kong, Singapore, China, Canada, and Continental Europe. The Fund considers an investment to be tied economically to a country if the issuer is organized in, has its principal place of business in, has principal trading activity in, or derives at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in such country or has at least 50% of its assets in such country. From time to time, the Fund’s investments with respect to a particular country may comprise a substantial portion of its investment portfolio. The Fund concentrates its investments in the real estate industry. The Fund’s Subadviser generally focuses on investing the Fund’s assets in equity REITs as well as similar entities formed under the laws of non-U.S. countries, but may also invest the Fund’s assets in mortgage REITs, hybrid REITs, and other U.S. and foreign real estate-related investments, including emerging market real estate-related investments. The Fund’s Subadviser may invest the Fund’s assets in real estate-related investments of any size. However, issuers of real estate-related investments tend to have small-to-medium capitalizations. The Fund’s Subadviser normally allocates the Fund’s investments across different REIT managers and property types but may from time to time focus the Fund’s investments in any one or a few of these areas. 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.
Strategy Portfolio Concentration [Text]	<span style="font-family:Arial;font-size:10pt;margin-left:0%;">The Fund invests, under normal circumstances, at least 80% of its net assets in a diversified portfolio of equity investments in real estate and real estate-related companies.</span>

GLOBAL REAL ESTATE FUND Investment Strategy - GLOBAL REAL ESTATE 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 its net assets in a diversified portfolio of equity investments in real estate and real estate-related companies. A company is considered a “real estate company” or “real estate-related company” if at least 50% of its net assets, gross income, or net profits are attributable to ownership, development, construction, financing, management, or sale of commercial, industrial or residential real estate or interests therein.The Fund invests primarily in real estate investment trusts (“REITs”) and equity securities, including common and preferred stocks and convertible securities. The Fund’s investments in real estate and real estate-related companies may include REITs, REIT-like structures, or real estate operating companies whose businesses and services are related to the real estate industry.In complying with the 80% investment requirement, the Fund may include synthetic securities that have economic characteristics similar to the Fund’s direct investments that are counted toward the 80% investment requirement. The Fund may invest in foreign securities, including securities of issuers in emerging markets. Under normal market conditions, the Fund expects to invest at least 30% of its assets in securities of issuers from at least three countries outside of the United States. The Fund expects to invest a substantial portion of its assets in foreign securities economically tied to Japan, the United Kingdom, Australia, Hong Kong, Singapore, China, Canada, and Continental Europe. The Fund considers an investment to be tied economically to a country if the issuer is organized in, has its principal place of business in, has principal trading activity in, or derives at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in such country or has at least 50% of its assets in such country. From time to time, the Fund’s investments with respect to a particular country may comprise a substantial portion of its investment portfolio. The Fund concentrates its investments in the real estate industry. The Fund’s Subadviser generally focuses on investing the Fund’s assets in equity REITs as well as similar entities formed under the laws of non-U.S. countries, but may also invest the Fund’s assets in mortgage REITs, hybrid REITs, and other U.S. and foreign real estate-related investments, including emerging market real estate-related investments. The Fund’s Subadviser may invest the Fund’s assets in real estate-related investments of any size. However, issuers of real estate-related investments tend to have small-to-medium capitalizations. The Fund’s Subadviser normally allocates the Fund’s investments across different REIT managers and property types but may from time to time focus the Fund’s investments in any one or a few of these areas. 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.

Strategy Portfolio Concentration [Text]

<span style="font-family:Arial;font-size:10pt;margin-left:0%;">The Fund invests, under normal circumstances, at least 80% of its net assets in a diversified portfolio of equity investments in real estate and real estate-related companies.</span>