S000024145 [Member] Investment Risks - MULTI-MANAGER GLOBAL REAL ESTATE FUND	Mar. 31, 2026
FOREIGN SECURITIES RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	FOREIGN SECURITIES RISK is the risk that investing in foreign (non‑U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments may impose limitations on foreigners’ ownership of interests in local issuers, restrictions on the ability to repatriate assets, and may also impose taxes. Any of these events could cause the value of the Fund’s investments to decline. Foreign banks, agents and securities depositories that hold the Fund’s foreign assets may be subject to little or no regulatory oversight over, or independent evaluation, of their operations. Additional costs associated with investments in foreign securities may include higher custodial fees than those applicable to domestic custodial arrangements and transaction costs of foreign currency conversions. Unless the Fund has hedged its foreign currency exposure, foreign securities risk also involves the risk of negative foreign currency rate fluctuations, which may cause the value of securities denominated in such foreign currency (or other instruments through which the Fund has exposure to foreign currencies) to decline in value. Currency exchange rates may fluctuate significantly over short periods of time. Currency hedging strategies, if used, are not always successful. For instance, forward foreign currency exchange contracts, if used by the Fund, could reduce performance if there are unanticipated changes in currency exchange rates.
MULTI MANAGER RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	MULTI-MANAGER RISK is the risk that the sub‑advisers’ investment styles will not always be complementary or that the investment adviser’s allocation of assets amongst sub‑advisers will not achieve the intended result, which could negatively impact the performance of the Fund. Sub‑advisers make investment decisions independently of one another, and may make decisions that conflict with each other.
MANAGEMENT RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	MANAGEMENT RISK is the risk that a strategy used by the Fund’s investment adviser or sub‑advisers may fail to produce the intended results or that imperfections, errors or limitations in the tools and data used by the investment adviser or the sub‑advisers may cause unintended results.
VALUATION RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	VALUATION RISK is the risk that the sale price the Fund could receive for a portfolio security may differ from the Fund’s valuation of the security, particularly for securities that trade in low volume or volatile markets or that are valued using a fair value methodology. It is possible that the Fund could incur a loss because a portfolio security is sold at a discount to the value ascribed to it for purposes of calculating the Fund’s net asset value. Fair value methodologies may involve more subjectivity than the use of market quotations when fair valuing an investment. In addition, the value of the securities in the Fund’s portfolio may change on days when shareholders will not be able to purchase or sell the Fund’s shares.
SECURITIES LENDING RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	SECURITIES LENDING RISK is the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral.
ISSUER FOCUS RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	ISSUER FOCUS RISK is the risk that the Fund’s portfolio may from time to time be comprised of a more limited number of issuers, even though the Fund is classified as a diversified fund. To the extent the Fund has greater exposure to any single investment or issuer, the Fund may be more significantly impacted by any economic, market, business, political, regulatory, or other occurrence affecting such investment or issuer. As a result, there may be more fluctuation in the price of the Fund’s shares.
SMALL AND MID CAP STOCK RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	SMALL AND MID CAP STOCK RISK is the risk that stocks of small and mid‑sized companies may be more volatile than stocks of larger, more established companies. Small and mid‑sized companies may have limited product lines or financial resources, may be dependent upon a particular niche of the market, or may be dependent upon a small or inexperienced management group. The securities of small and mid‑sized companies may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally, the smaller the company size, the greater the risk.
MARKET RISKS [Member]
Prospectus [Line Items]
Risk [Text Block]	MARKET RISK is the risk that the value of the Fund’s investments may increase or decrease in response to expected, real or perceived economic, political or financial events in the U.S. or global markets. The frequency and magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in response to changing market conditions, inflation, elevated levels of government debt, changes in interest rates, lack of liquidity in the bond or equity markets or volatility in the equity markets. Market disruptions caused by local or regional events such as financial institution failures, changes in trade regulation or economic sanctions, internal unrest and discord, war, acts of terrorism, the spread of infectious illness (including epidemics and pandemics) or other public health issues, recessions, the threat or occurrence of a government shutdown, or other events or adverse investor sentiment could have a significant impact on the Fund and its investments. During periods of market disruption or other abnormal market conditions, the Fund’s exposure to risks described elsewhere in this summary will likely increase.
REAL ESTATE SECURITIES CONCENTRATION RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	REAL ESTATE SECURITIES CONCENTRATION RISK is the risk that investments in securities of real estate companies will make the Fund more susceptible to risks associated with the ownership of real estate and with the real estate industry in general. Real estate companies may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets. The value of real estate securities may underperform other sectors of the economy or broader equity markets. To the extent that the Fund concentrates its investments in the real estate industry, it will be subject to greater risk of loss than if it were diversified across different industries.
REIT RISK [Member]
Prospectus [Line Items]
Risk [Text Block]	REIT RISK is the risk that the Fund’s investments will be affected by factors affecting REITs and the real estate sector generally. Investing in REITs involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. These risks include possible declines in the value of real estate, possible lack of mortgage funds and unexpected vacancies of properties. REITs that invest in real estate mortgages are also subject to prepayment risks. REITs whose underlying properties are concentrated in a particular industry or geographic region are also subject to risks affecting such industries and regions. REITs are also subject to heavy cash flow dependency, defaults by borrowers, self-liquidation, interest rate risks (especially mortgage REITs) and liquidity risk. REITs may have limited financial resources, may trade less frequently and in lower volume, engage in dilutive offerings or become more volatile than other securities. By investing in REITs through the Fund, a shareholder will bear expenses of the REITs in addition to expenses of the Fund. In addition, REITs could possibly fail to (i) qualify for favorable tax treatment under applicable tax law, or (ii) maintain their exemptions from registration under the Investment Company Act of 1940.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	As with any mutual fund, it is possible to lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Member]
Prospectus [Line Items]
Risk [Text Block]	An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.

S000024145 [Member] Investment Risks - MULTI-MANAGER GLOBAL REAL ESTATE FUND

Mar. 31, 2026

FOREIGN SECURITIES RISK is the risk that investing in foreign (non‑U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments may impose limitations on foreigners’ ownership of interests in local issuers, restrictions on the ability to repatriate assets, and may also impose taxes. Any of these events could cause the value of the Fund’s investments to decline. Foreign banks, agents and securities depositories that hold the Fund’s foreign assets may be subject to little or no regulatory oversight over, or independent evaluation, of their operations. Additional costs associated with investments in foreign securities may include higher custodial fees than those applicable to domestic custodial arrangements and transaction costs of foreign currency conversions. Unless the Fund has hedged its foreign currency exposure, foreign securities risk also involves the risk

of negative foreign currency rate fluctuations, which may cause the value of securities denominated in such foreign currency (or other instruments through which the Fund has exposure to foreign currencies) to decline in value. Currency exchange rates may fluctuate significantly over short periods of time. Currency hedging strategies, if used, are not always successful. For instance, forward foreign currency exchange contracts, if used by the Fund, could reduce performance if there are unanticipated changes in currency exchange rates.

MULTI MANAGER RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

MULTI-MANAGER RISK is the risk that the sub‑advisers’ investment styles will not always be complementary or that the investment adviser’s allocation of assets amongst sub‑advisers will not achieve the intended result, which could negatively impact the performance of the Fund. Sub‑advisers make investment decisions independently of one another, and may make decisions that conflict with each other.

MANAGEMENT RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

MANAGEMENT RISK is the risk that a strategy used by the Fund’s investment adviser or sub‑advisers may fail to produce the intended results or that imperfections, errors or limitations in the tools and data used by the investment adviser or the sub‑advisers may cause unintended results.

VALUATION RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

VALUATION RISK is the risk that the sale price the Fund could receive for a portfolio security may differ from the Fund’s valuation of the security, particularly for securities that trade in low volume or volatile markets or that are valued using a fair value methodology. It is possible that the Fund could incur a loss because a portfolio security is sold at a discount to the value ascribed to it for purposes of calculating the Fund’s net asset value. Fair value methodologies may involve more subjectivity than the use of market quotations when fair valuing an investment. In addition, the value of the securities in the Fund’s portfolio may change on days when shareholders will not be able to purchase or sell the Fund’s shares.

SECURITIES LENDING RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

SECURITIES LENDING RISK is the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral.

ISSUER FOCUS RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

ISSUER FOCUS RISK is the risk that the Fund’s portfolio may from time to time be comprised of a more limited number of issuers, even though the Fund is classified as a diversified fund. To the extent the Fund has greater exposure to any single investment or issuer, the Fund may be more significantly impacted by any economic, market, business, political, regulatory, or other occurrence affecting such investment or issuer. As a result, there may be more fluctuation in the price of the Fund’s shares.

SMALL AND MID CAP STOCK RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

SMALL AND MID CAP STOCK RISK is the risk that stocks of small and mid‑sized companies may be more volatile than stocks of larger, more established companies. Small and mid‑sized companies may have limited product lines or financial resources, may be dependent upon a particular niche of the market, or may be dependent upon a small or inexperienced management group. The securities of small and mid‑sized companies may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally, the smaller the company size, the greater the risk.

MARKET RISKS [Member]

Prospectus [Line Items]

Risk [Text Block]

MARKET RISK is the risk that the value of the Fund’s investments may increase or decrease in response to expected, real or perceived economic, political or financial events in the U.S. or global markets. The frequency and magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in response to changing market conditions, inflation, elevated levels of government debt, changes in interest rates, lack of liquidity in the bond or equity markets or volatility in the equity markets. Market disruptions caused by local or regional events such as financial institution failures, changes in trade regulation or economic sanctions, internal unrest and discord, war, acts of terrorism, the spread of infectious illness (including epidemics and pandemics) or other public health issues, recessions, the threat or occurrence of a government shutdown, or other events or adverse investor sentiment could have a significant impact on the Fund and its investments. During periods of market disruption or other abnormal market conditions, the Fund’s exposure to risks described elsewhere in this summary will likely increase.

REAL ESTATE SECURITIES CONCENTRATION RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

REAL ESTATE SECURITIES CONCENTRATION RISK is the risk that investments in securities of real estate companies will make the Fund more susceptible to risks associated with the ownership of real estate and with the real estate industry in general. Real estate companies may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets. The value of real estate securities may underperform other sectors of the economy or broader equity markets. To the extent that the Fund concentrates its investments in the real estate industry, it will be subject to greater risk of loss than if it were diversified across different industries.

REIT RISK [Member]

Prospectus [Line Items]

Risk [Text Block]

REIT RISK is the risk that the Fund’s investments will be affected by factors affecting REITs and the real estate sector generally. Investing in REITs involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. These risks include possible declines in the value of real estate, possible lack of mortgage funds and unexpected vacancies of properties. REITs that invest in real estate mortgages are also subject to prepayment risks. REITs whose underlying properties are concentrated in a particular industry or geographic region are also subject to risks affecting such industries and regions. REITs are also subject to heavy cash flow dependency, defaults by borrowers, self-liquidation, interest rate risks (especially mortgage REITs) and liquidity risk. REITs may have limited financial resources, may trade less frequently and in lower volume, engage in dilutive offerings or become more volatile than other securities. By investing in REITs through the Fund, a shareholder will bear expenses of the REITs in addition to expenses of the Fund. In addition, REITs could possibly fail to (i) qualify for favorable tax treatment under applicable tax law, or (ii) maintain their exemptions from registration under the Investment Company Act of 1940.

Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

As with any mutual fund, it is possible to lose money on an investment in the Fund.

Risk Not Insured Depository Institution [Member]

Prospectus [Line Items]

Risk [Text Block]

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.