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S000033427 [Member] Investment Risks - GLOBAL TACTICAL ASSET ALLOCATION FUND
Mar. 31, 2026
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.
ASSET ALLOCATION RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ASSET ALLOCATION RISK is the risk that the allocation of the Fund’s assets among the various asset classes and market segments will not perform as expected. The Fund’s investment in any one asset class may exceed 15% of the Fund’s total assets, which may cause it to be subject to greater volatility and risk than a more diversified fund.
UNDERLYING FUND RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
UNDERLYING FUND RISK is the risk that the Fund’s investment performance and its ability to achieve its investment objective are directly related to the performance of the Underlying Funds in which it invests. There can be no assurance that the Underlying Funds will achieve their respective investment objectives. The Fund will be subject to the risks associated with investments in the Underlying Funds, such as the possibility that the value of the securities or instruments held by the Underlying Funds could decrease. In addition, passively managed Underlying Funds may not track the performance of their respective reference assets and may hold troubled securities or other investments. Investments in Underlying Funds may involve duplication of management fees and certain other expenses, as the Fund indirectly bears its proportionate share of any expenses paid by the Underlying Funds in which it invests. Further, investments in ETFs are subject to the following additional risks: (1) an ETF’s shares may trade above or below its net asset value; (2) an active trading market for the ETF’s shares may not develop or be maintained; and (3) trading in an ETF’s shares may be halted by the listing exchange. The Fund is subject to the risks of the Underlying Funds in direct proportion to the allocation of its assets among the Underlying Funds. NTI may be subject to potential conflicts of interest with respect to investments in affiliated Underlying Funds, which are Underlying Funds managed by NTI or its affiliates, because the fees paid to NTI by some affiliated Underlying Funds may be higher than the fees paid by other Underlying Funds.
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.
EMERGING MARKETS RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
EMERGING MARKETS RISK is the risk that emerging markets are generally subject to greater market volatility, political, social and economic instability, uncertain trading markets and more governmental limitations on foreign investments than more developed markets. In addition, companies operating in emerging markets may be subject to lower trading volumes and greater price volatility than companies in more developed markets. Emerging market economies may be based on only a few industries, may be highly vulnerable to changes in local and global trade conditions, and may suffer from extreme and volatile debt burdens or inflation rates. Companies in emerging market countries generally may be subject to less stringent regulatory, disclosure, financial reporting, accounting, auditing and recordkeeping standards than companies in more developed countries. As a result, information, including financial information, about such companies may be less available and reliable, which can impede the Fund’s ability to evaluate such companies. Securities law and the enforcement of systems of taxation in many emerging market countries may change quickly and unpredictably, and the ability to bring and enforce actions (including bankruptcy, confiscatory taxation, expropriation, nationalization of a company’s assets, restrictions on foreign ownership of local companies, restrictions on withdrawing assets from the country, protectionist measures and practices such as share blocking), or to obtain information needed to pursue or enforce such actions, may be limited. Investments in emerging market securities may be subject to additional transaction costs, delays in settlement procedures, unexpected market closures, and lack of timely information.
MANAGEMENT RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
MANAGEMENT RISK is the risk that a strategy used by the Fund’s investment adviser may fail to produce the intended results or that imperfections, errors or limitations in the tools and data used by the investment adviser may cause unintended results.
COMMODITY RELATED SECURITIES RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
COMMODITY-RELATED SECURITIES RISK is the risk that exposure to the commodities markets may subject the Fund to greater volatility than investments in other kinds of securities. In addition to overall market movements, commodity-related securities may be adversely impacted by commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity, such as weather, disease (including pandemics or epidemics), tariffs, embargoes or other trade barriers, acts of war or terrorism, or political and regulatory developments.
CREDIT OR DEFAULT RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
CREDIT (OR DEFAULT) RISK is the risk that the inability or unwillingness of an issuer or guarantor of a fixed-income security, or a counterparty to a repurchase or other transaction, to meet its principal or interest payments or other financial obligations in a timely manner will adversely affect the value of the Fund’s investments and its returns. Changes in an issuer’s financial strength, the market’s perception of an issuer’s creditworthiness, or in the credit rating of the issuer or the security may also affect the value of the Fund’s investment in that issuer.
DEBT EXTENSION RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
DEBT EXTENSION RISK is the risk that when interest rates rise an issuer will exercise its right to pay principal on certain debt securities held by the Fund later than expected. This will cause the value of the security, and the Fund’s NAV, to decrease, and the Fund may lose opportunities to invest in higher yielding securities.
DERIVATIVES RISKS [Member]  
Prospectus [Line Items]  
Risk [Text Block]
DERIVATIVES RISK is the risk that derivatives may pose risks in addition to and greater than those associated with investing directly in securities, currencies and other instruments, may be illiquid or less liquid, more volatile, more difficult to value and leveraged so that small changes in the value of the underlying instrument may produce disproportionate losses to the Fund. Derivatives are also subject to counterparty risk, which is the risk that the other party to the transaction will not perform its contractual obligations. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with investments in more traditional securities and instruments.
 
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FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS RISK is the risk that, if forward prices increase, a loss will occur to the extent that the agreed upon purchase price of the currency exceeds the price of the currency that was agreed to be sold.
 
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FUTURES CONTRACTS RISK is the risk that there will be imperfect correlation between the change in market value of the Fund’s securities and the price of futures contracts, which may result in the strategy not working as intended; the possible inability of the Fund to sell or close out a futures contract at the desired time or price; losses due to unanticipated market movements, which potentially are unlimited; and the possible inability of the Fund’s investment adviser to correctly predict the direction of securities’ prices, interest rates, currency exchange rates and other economic factors, which may make the Fund’s returns more volatile or increase the risk of loss.
 
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OPTIONS CONTRACTS RISK is the risk that there may be an imperfect correlation between the options and the
  securities markets that cause a given transaction to fail to achieve its objectives. The successful use of options depends on the investment adviser’s ability to predict correctly future price fluctuations and the degree of correlation between the options and securities markets. Exchanges can limit the number of positions that can be held or controlled by the Fund or the investment adviser, thus limiting the ability to implement the Fund’s strategies.
GEOGRAPHIC RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
GEOGRAPHIC RISK is the risk that if the Fund invests a significant portion of its total assets in certain issuers within the same country or geographic region, an adverse economic, business or political development affecting that country or region may affect the value of the Fund’s investments more, and the Fund’s investments may be more volatile, than if the Fund’s investments were not so concentrated in such country or region.
SECTOR RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
SECTOR RISK is the risk that companies in similar businesses may be similarly affected by particular economic or market events, which may, in certain circumstances, cause the value of securities of all companies in a particular sector of the market to decrease.
 
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FINANCIALS SECTOR RISK is the risk that companies in the financial sector can be significantly affected by changes in interest rates, government regulation, the rate of corporate and consumer debt defaulted, price competition, and the availability and cost of capital, among other factors.
 
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INFORMATION TECHNOLOGY SECTOR RISK is the risk that securities of technology companies may be subject to greater price volatility than securities of companies in other sectors. These securities may fall in and out of favor with investors rapidly, which may cause sudden selling and dramatically lower market prices. Technology companies also may be affected adversely by changes in technology, consumer and business purchasing patterns, government scrutiny or regulation, legal action and/or obsolete products or services.
HIGH YIELD RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
HIGH-YIELD RISK is the risk that the Fund’s below-investment grade fixed-income securities, sometimes known as “junk bonds,” will be subject to greater credit risk, price volatility, liquidity risk, and risk of loss than investment grade securities, which can adversely impact the Fund’s return and NAV. High yield securities are considered highly speculative and are subject to the increased risk of an issuer’s inability to make principal and interest payments.
INTEREST RATE RISKS [Member]  
Prospectus [Line Items]  
Risk [Text Block]
INTEREST RATE RISK is the risk that during periods of rising interest rates, the market value of the Fund’s securities will tend to be lower than prevailing market rates and in periods of falling interest rates, the market value of the Fund’s securities will tend to be higher. The Fund’s yield will vary as short-term securities in its portfolio mature and the proceeds are reinvested in securities with different interest rates. In general, securities with longer maturities or durations are more sensitive to interest rate changes. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions for the Fund. During periods when inflation rates are high or rising, or during periods of low interest rates, the Fund may be subject to a greater risk of rising interest rates. Interest rate changes can be sudden and unpredictable and may have unpredictable effects on the markets and the Fund’s investments, may result in heightened market volatility, may impact the liquidity of fixed-income securities and of the Fund, and may detract from Fund performance.
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.
ASSET BACKED AND MORTGAGE BACKED SECURITIES RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ASSET-BACKED AND MORTGAGE-BACKED SECURITIES RISK is the risk that such securities may be less liquid than other bonds, and may be more sensitive than other bonds to the market’s perception of issuers and creditworthiness of payees, particularly in declining general economic conditions when concern regarding mortgagees’ ability to pay (e.g., the ability of homeowners, commercial mortgagees, consumers with student loans, automobile loans or credit card debtholders to make payments on the underlying loan pools) rises, which may result in the Fund experiencing difficulty selling or valuing these securities. In addition, these securities may not be backed by the full faith and credit of the U.S. government, have experienced extraordinary weakness and volatility at various times in recent years, and may decline quickly in the event of a substantial economic or market downturn. Those asset-backed and mortgage-backed securities that are guaranteed as to the timely payment of interest and principal by a government entity, are not guaranteed as to market price, which will fluctuate. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain asset-backed and mortgage-backed securities.
An unexpectedly high rate of defaults on the mortgages held by a mortgage pool may adversely affect the value of mortgage-backed securities and could result in losses to the Fund.
PREPAYMENT OR CALL RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
PREPAYMENT (OR CALL) RISK is the risk that an issuer could exercise its right to pay principal on callable debt securities held
by the Fund earlier than expected. Issuers may be more likely to prepay when interest rates fall, when credit spreads change, or when an issuer’s credit quality improves. If this happens, the Fund will not benefit from the rise in the market price of the securities that normally accompanies a decline in interest rates, and will be forced to reinvest prepayment proceeds in lower yielding securities, which may reduce the Fund’s returns. The Fund may also lose any premium it paid to purchase the securities.
REAL ESTATE SECURITIES RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
REAL ESTATE SECURITIES RISK is the risk that investments in real estate investment trusts (“REITs”) and 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. These risks include possible declines in the value of real estate, possible lack of mortgage funds and unexpected vacancies of properties, defaults by borrowers or tenants, increases in property taxes, fluctuations in interest rates and limited availability of mortgage financing. REITs that invest in real estate mortgages are also subject to prepayment risks. REITs and real estate companies may be less diversified than other pools of securities, may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets. The Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests, in addition to the expenses of the Fund.
US GOVERNMENT SECURITIES RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. GOVERNMENT SECURITIES RISK is the risk that the U.S. government will not provide financial support to its agencies, instrumentalities or sponsored enterprises if it is not obligated to do so by law. Certain U.S. government securities purchased by the Fund are neither issued nor guaranteed by the U.S. Treasury and, therefore, may not be backed by the full faith and credit of the United States. The maximum potential liability of the issuers of some U.S. government securities may greatly exceed their current resources, including any legal right to support from the U.S. Treasury. It is possible that the issuers of such securities will not have the funds to meet their payment obligations in the future.
PORTFOLIO TURNOVER RISK [Member]  
Prospectus [Line Items]  
Risk [Text Block]
PORTFOLIO TURNOVER RISK is the risk that high portfolio turnover, including investments made on a shorter-term basis or instruments with a maturity of one year or less at the time of acquisition, may lead to increased Fund expenses that may result in lower investment returns. High portfolio turnover may also result in higher short-term capital gains taxable to shareholders.
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.