The Fund seeks primarily to implement a convertible arbitrage strategy by investing in convertible securities, including convertible preferred securities, and establishing short positions, or hedges, in the common stock of the issuers of the convertible securities. The short positions are intended to reduce the Fund’s exposure to decreases in the price of the related common stock. The Fund seeks to hedge its long positions in this way on a security-by-security basis. The Fund may also use other instruments to establish hedges, including exchange-traded funds (“ETFs”), options and currency forwards, as appropriate, to reduce unwanted exposures.The term “convertible security” refers to a bond or a preferred stock (including a trust preferred security) that can be converted into shares of a company’s common stock. The Fund’s strategy in this regard is managed on a day-to-day basis by SSI Investment Management LLC, the sub-advisor to the Fund.The Fund may also implement other investment strategies, depending on market conditions, including investing in convertible securities with attractive yields and relatively little equity price sensitivity, selling call options against the related equities and convertible bonds to receive the value of the option (also known as “covered-call writing”), and investing in non-convertible bonds and preferred stock that offer attractive yield and relative value as compared to other investment alternatives, and investing in event-driven equity opportunities including investments in Special Purpose Acquisition Companies (SPACs). The investment focus will shift through market cycles as opportunities change.Pursuant to its strategy, the Fund seeks returns that exceed prevailing short-term interest rates, such as the return on 90-day U.S. Treasury bills, from four primary sources: 1) net dividend income on equity and convertible securities positions; 2) interest income on convertible securities positions; 3) interest rebates on short positions; and 4) net capital gains from trading profits. In combining long positions in convertible securities with short positions in common stock of the issuers of those securities, the Fund seeks to maintain a “hedged convertible” investment portfolio with income and returns which are generally less volatile than and have low correlation with the broader capital markets, short-term interest rates and capital markets indices (absolute returns).The Fund generally invests in convertible securities that are part of an issuance of at least $40 million in size and are issued by companies with market capitalizations between $500 million and $10 billion. The convertible securities are typically callable by the issuer and are not limited as to duration or maturity. The issuers of the convertible securities in which the Fund will invest may include U.S. or non-U.S. companies, real estate investment trusts (“REITs”), and emerging-market companies. The instruments may be denominated in foreign, or non-U.S., currencies; however, such exposures are typically hedged back to the U.S. dollar. The Fund may hold investment-grade, below investment-grade (i.e., “high yield” or “junk” bonds) and unrated securities that are deemed by the sub-advisor to be of equivalent quality. A significant portion of the Fund’s holdings is expected to be unrated. The Fund’s holdings may include variable and floating-rate coupon, zero-coupon and pay-in-kind (“PIK”) instruments and restricted securities, such as those issued under Rule 144A of the Securities Act of 1933. To a lesser extent, the Fund may utilize securities issued by business development companies and may invest long or short in ETFs to adjust or hedge exposures.The Fund may have significant exposure to the Financial sector. However, as the sector composition of the Fund’s portfolio changes over time, the Fund’s exposure to the Financial sector may be lower at a future date, and the Fund’s exposure to other market sectors may be higher. The Fund may also invest in long or short positions in derivative instruments, such as futures, forwards, swaps, options and warrants, to hedge exposures in the Fund. Futures contracts generally include those based on U.S. treasuries and foreign currencies, forward contracts are generally forward currency contracts (including non-deliverable forwards), swaps generally include interest rate and credit default swaps, options generally include call and put options, and warrants are generally similar to long-dated call options. On a short-term basis, the Fund may invest cash balances in other investment companies, including money market funds that are advised by the Manager.The sub-advisor seeks to identify convertible securities that it believes are undervalued by assessing, among other attributes, the quality, income, liquidity and “equity sensitivity” of the security (i.e., the sensitivity of a convertible security’s price to changes in the price of the issuer’s common stock). The sub-advisor also considers the availability of the common stock that it intends to short. After acquiring a convertible security, the Fund establishes a short position in the common stock, American Depositary Receipt (“ADR”), call option or other equity-related instrument of the same issuer. The Fund may also establish short positions in ETFs. The size of each short position is based on the sensitivity of the convertible security’s price to changes in the price of the issuer’s common stock. As a result, the Fund’s short positions will generally be smaller on a dollar value basis than its long positions since a convertible security’s price is typically less sensitive than that of the common stock. The Fund may also invest in non-convertible bonds and preferred stock that it believes are undervalued. Such investments would typically not include a short position in a related equity instrument.When implementing its covered-call writing strategy, the Fund seeks to sell call options related to its equity and convertible bond holdings. In doing so, the Fund seeks to minimize its exposure to changes in the underlying equity price yet retain the proceeds received from selling the option (the “option premium”). Typically, higher volatility in equity prices leads to larger proceeds from selling options.The sub-advisor considers selling a convertible security and closing the related short position when it determines the convertible security is no longer undervalued, when it anticipates a potentially unfavorable change in the structure of a convertible security or the underlying company or to satisfy shareholder redemptions, among other reasons.The Fund may engage in active and frequent trading of portfolio securities to achieve its principal investment strategies.

Risk Narrative [Text Block]

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There is no assurance that the Fund will achieve its investment objectives and you could lose part or all of your investment in the Fund. The Fund is not designed for investors who need an assured level of current income and is intended to be a long-term investment. The Fund is not a complete investment program and may not be appropriate for all investors. Investors should carefully consider their own investment goals and risk tolerance before investing in the Fund. The principal risks of investing in the Fund listed below are presented in alphabetical order and not in order of importance or potential exposure. Among other matters, this presentation is intended to facilitate your ability to find particular risks and compare them with the risks of other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears.Allocation RiskThe sub-advisor’s judgments about, and allocations among, strategies, asset classes and market exposures may adversely affect the Fund’s performance. There can be no assurance, particularly during periods of market disruption and stress, that the sub-advisor’s judgments about asset allocation will be correct. This risk may be increased by the use of derivatives to increase allocations to various market exposures.Callable Securities RiskThe Fund may invest in fixed-income securities with call features. A call feature allows the issuer of the security to redeem or call the security prior to its stated maturity date. In periods of falling interest rates, issuers may be more likely to call in securities that are paying higher coupon rates than prevailing interest rates. In the event of a call, the Fund would lose the income that would have been earned to maturity on that security, and the proceeds received by the Fund may be invested in securities paying lower coupon rates and may not benefit from any increase in value that might otherwise result from declining interest rates.Convertible Securities RiskThe value of a convertible security, including a convertible preferred security, typically increases or decreases with the price of the underlying common stock. In general, a convertible security is subject to the risks of stocks when the underlying stock’s price is high relative to the conversion price and is subject to the risks of debt securities when the underlying stock’s price is low relative to the conversion price. The general market risks of debt securities that are common to convertible securities include, but are not limited to, interest rate risk and credit risk. Many convertible securities have credit ratings that are below investment grade and are subject to the same risks as an investment in below investment grade debt securities (commonly known as “junk bonds”). Lower-rated debt securities may fluctuate more widely in price and yield than investment grade debt securities and may fall in price during times when the economy is weak or is expected to become weak. Convertible securities are subject to the risk that the credit standing of the issuer may have an effect on the convertible security‘s investment value. In addition, to the extent the Fund invests in convertible securities issued by small- or mid-capitalization companies, it will be subject to the risks of investing in such companies. The stocks of small- and mid-capitalization companies may fluctuate more widely in price than the market as a whole and there may also be less trading in small- or mid-capitalization stocks. Convertible securities are sensitive to movement in interest rates.Counterparty RiskThe Fund is subject to the risk that a party or participant to a transaction, such as a broker or derivative counterparty, will be unwilling or unable to satisfy its obligation to make timely principal, interest or settlement payments or to otherwise honor its obligations to the Fund.Credit RiskThe Fund is subject to the risk that the issuer or guarantor of an obligation, or the counterparty to a transaction, including a derivatives contract or a loan, may fail, or become less able, to make timely payment of interest or principal or otherwise honor its obligations or default completely. Credit risk is typically greater for securities with ratings that are below investment grade (commonly referred to as “junk bonds”). Since the Fund can invest significantly in high yield investments that are considered speculative in nature, this risk may be substantial. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance.Currency RiskThe Fund may have exposure to foreign currencies by using various instruments described below. Foreign currencies may fluctuate significantly over short periods of time, may be affected unpredictably by intervention, or the failure to intervene, of the U.S. or foreign governments or central banks, and may be affected by currency controls or political developments in the U.S. or abroad. Foreign currencies may also decline in value relative to the U.S. dollar and other currencies and thereby affect the Fund’s investments in non-U.S. currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, non-U.S. currencies. The Fund may gain exposure to foreign currencies because of its investments in one or more of the following:Securities denominated in non-U.S. currenciesForeign currency forward contracts, including non-deliverable forwards (“NDFs”), which are described below under “Derivatives Risk - Futures and Forward Contracts”Non-U.S. currency futures contracts, which are described below under “Derivatives Risk - Futures and Forward Contracts”Cybersecurity and Operational RiskOperational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund and its service providers as well as the ability of shareholders to transact with the Fund. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. Most issuers in which the Fund invests are heavily dependent on computers for data storage and operations, and require ready access to the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of securities in which the Fund invests, leading to significant loss of value.Derivatives RiskDerivatives may involve significant risk. The use of derivative instruments may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities or other instruments underlying those derivatives, including the high degree of leverage often embedded in such instruments, and potential material and prolonged deviations between the theoretical value and realizable value of a derivative. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund’s initial investment. Derivatives may at times be illiquid, and the Fund may not be able to close out or sell a derivative at a particular time or at an anticipated price. Certain derivatives may be difficult to value, and valuation may be more difficult in times of market turmoil. Derivatives may also be more volatile than other types of investments. The Fund may buy or sell derivatives not traded on an exchange, which may be subject to heightened liquidity and valuation risk. Derivative investments can increase portfolio turnover and transaction costs. Derivatives also are subject to counterparty risk and credit risk. As a result, the Fund may not recover its investment or may only obtain a limited recovery, and any recovery may be delayed. Not all derivative transactions require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Ongoing changes to the regulation of the derivatives markets and potential changes in the regulation of funds using derivative instruments could limit the Fund’s ability to pursue its investment strategies. New regulation of derivatives may make them more costly, or may otherwise adversely affect their liquidity, value or performance. In addition, the Fund’s investments in derivatives are subject to the following risks:Foreign Currency Forward Contracts Risk. Foreign currency forward contracts, including non-deliverable forwards (“NDFs”), are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of foreign currency at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract. The use of foreign currency forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities or currencies underlying the foreign currency forward contract.Forward Contracts Risk. Forward contracts, including NDFs, are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed. Not all forward contracts, including NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Forward currency transactions, including NDFs, and forward currency contracts include the risks associated with fluctuations in currency, and other risks inherent in trading derivatives. The use of forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities underlying the forward contract. Futures Contracts Risk. Futures contracts are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date. The use of such derivative instruments may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities underlying those derivatives. There can be no assurance that any strategy used will succeed. There may at times be an imperfect correlation between the movement in the prices of futures contracts and the value of their underlying instruments or indexes. There also can be no assurance that, at all times, a liquid market will exist for offsetting a futures contract that the Fund has previously bought or sold, and this may result in the inability to close a futures contract when desired. Futures contracts may experience potentially dramatic price changes, which will increase the volatility of the Fund and may involve a small investment of cash (the amount of initial and variation margin) relative to the magnitude of the risk assumed (the potential increase or decrease in the price of the futures contract). Treasury futures contracts expose the Fund to price fluctuations resulting from changes in interest rates and to potential losses if interest rates do not move as expected.Options Risk. An option is a contract that gives the purchaser (holder) of the option, in return for a premium, the right to buy from (call) or sell to (put) the seller (writer) of the option the security or currency underlying the option at a specified exercise price at any time during the term of the option (normally not exceeding nine months). There can be no guarantee that the use of options will increase the Fund’s return or income. In addition, there may be an imperfect correlation between the movement in prices of options and the securities underlying them, and there may at times not be a liquid secondary market for options. If an option that the Fund has purchased expires unexercised, the Fund will experience a loss in the amount of the premium it paid. In order for a call option to be profitable, the market price of the underlying security or index must rise sufficiently above the call option exercise price to cover the premium and any transaction costs. These costs will reduce any profit that might otherwise have been realized had the Fund bought the underlying security instead of the call option. If the Fund sells (writes) a call option, there is a risk that the Fund may be required to sell the underlying asset at a disadvantageous price. If the Fund sells a call option on an underlying asset that the Fund owns, and the underlying asset has increased in value when the call option is exercised, the Fund will be required to sell the underlying asset at the call price and will not be able to realize any of the underlying asset’s value above the call price. In order for a put option to be profitable, the market price of the underlying security or index must decline sufficiently below the put option’s exercise price to cover the premium and any transaction costs. By using put options in this manner, the Fund will reduce any profit it might otherwise have realized from having shorted the declining underlying security by the premium paid for the put option and by transaction costs. If the Fund sells (writes) a put option, there is a risk that the Fund may be required to buy the underlying asset at a disadvantageous price. By writing put options, the Fund takes on the risk of declines in the value of the underlying instrument, including the possibility of a loss up to the entire strike price of each option it sells, but without the corresponding opportunity to benefit from potential increases in the value of the underlying instrument. If there is a broad market decline and the Fund is not able to close out its written put options, it may result in substantial losses to the Fund.Swap Agreements Risk. Swap agreements or “swaps” are transactions in which the Fund and a counterparty agree to pay or receive payments at specified dates based upon or calculated by reference to changes in specified prices or rates or the performance of specified securities, indices or other assets based on a specified amount (the “notional” amount). Swaps can involve greater risks than a direct investment in an underlying asset, because swaps typically include a certain amount of embedded leverage and as such are subject to leverage risk. If swaps are used as a hedging strategy, the Fund is subject to the risk that the hedging strategy may not eliminate the risk that it is intended to offset, due to, among other reasons, the occurrence of unexpected price movements or the non-occurrence of expected price movements. Swaps also may be difficult to value. Swaps may be subject to liquidity risk and counterparty risk, and swaps that are traded over-the-counter are not subject to standardized clearing requirements and may involve greater liquidity and counterparty risks. The Fund may invest in the following types of swaps:Credit default swaps, which may be subject to credit risk and the risks associated with the purchase and sale of credit protection.Interest rate swaps, which may be subject to interest rate risk and credit risk.Warrants Risk. Warrants are derivative securities that give the holder the right to purchase a specified amount of securities at a specified price. Warrants may be more speculative than certain other types of investments because warrants do not carry with them dividend or voting rights with respect to the underlying securities, or any rights in the assets of the issuer. In addition, the value of a warrant does not necessarily change with the value of the underlying securities, and a warrant ceases to have value if it is not exercised prior to its expiration date. The market for warrants may be very limited and there may at times not be a liquid secondary market for warrants.Dividend RiskAn issuer of stock held by the Fund may choose not to declare a dividend or the dividend rate might not remain at current levels or increase over time. Dividend paying stocks might not experience the same level of earnings growth or capital appreciation as non-dividend paying stocks.Emerging Markets RiskWhen investing in emerging markets, the risks of investing in foreign securities are heightened. Emerging markets are generally smaller, less developed, less liquid and more volatile than the securities markets of the U.S. and other developed markets. There are also risks of: greater political or economic uncertainties; an economy’s dependence on revenues from particular commodities or on international aid or development assistance; currency transfer restrictions; a limited number of potential buyers for such securities resulting in increased volatility and limited liquidity for emerging market securities; trading suspensions; and delays and disruptions in securities settlement procedures. The governments of emerging market countries may also be more unstable and more likely to impose capital controls, nationalize a company or industry, place restrictions on foreign ownership and on withdrawing sale proceeds of securities from the country, intervene in the financial markets, and/or impose burdensome taxes that could adversely affect security prices. In addition, there may be less publicly available information about issuers in emerging markets than would be available about issuers in more developed capital markets, and such issuers may not be subject to accounting, auditing and financial reporting standards and requirements comparable to those to which U.S. companies are subject.Equity Investments RiskEquity securities are subject to investment risk and market risk. The Fund may invest in the following equity securities, which may expose the Fund to the following additional risks:Common Stock Risk. The value of a company’s common stock may fall as a result of factors affecting the company, companies in the same industry or sector, or the financial markets overall. Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company.Depositary Receipts and U.S. Dollar-Denominated Foreign Stocks Traded on U.S. Exchanges Risk. Depositary receipts and U.S. dollar-denominated foreign stocks traded on U.S. exchanges are subject to certain of the risks associated with investing directly in foreign securities, including, but not limited to, currency exchange rate fluctuations, political and financial instability in the home country of a particular depositary receipt or foreign stock, less liquidity, more volatility, less government regulation and supervision and delays in transaction settlement.Preferred Stock Risk. Preferred stocks are sensitive to movements in interest rates. Preferred stocks may be less liquid than common stocks and, unlike common stocks, participation in the growth of an issuer may be limited. Distributions on preferred stocks generally are payable at the discretion of an issuer and after required payments to bond holders. In certain situations, an issuer may call or redeem its preferred stock or convert it to common stock. The market prices of preferred stocks are generally more sensitive to actual or perceived changes in the issuer’s financial condition or prospects than are the prices of debt securities.Real Estate Investment Trusts (“REITs”) Risk. Investments in REITs are subject to the risks associated with investing in the real estate industry, including, among other risks: adverse developments affecting the real estate industry; declines in real property values; changes in interest rates; defaults by mortgagors or other borrowers and tenants; lack of availability of mortgage funds or financing; extended vacancies of properties, especially during economic downturns; casualty or condemnation losses; and governmental actions, such as changes to tax laws, zoning regulations or environmental regulations. REITs also are dependent upon the skills of their managers and are subject to heavy cash flow dependency or self-liquidation. Regardless of where a REIT is organized or traded, its performance may be affected significantly by events in the region where its properties are located. Domestic REITs could be adversely affected by failure to qualify for tax-free “pass-through” of distributed net income and net realized gains under the Internal Revenue Code of 1986, as amended (“Internal Revenue Code”), or to maintain their exemption from registration under the Investment Company Act of 1940, as amended (“Investment Company Act”). REITs typically incur fees that are separate from those incurred by the Fund. Accordingly, the Fund’s investment in REITs will result in the layering of expenses such that shareholders will indirectly bear a proportionate share of the REITs’ operating expenses, in addition to paying Fund expenses. The value of REIT common stock may decline when interest rates rise. REITs tend to be small- to mid-capitalization securities and, as such, are subject to the risks of investing in small- to mid-capitalization securities.Event-Driven Investing RiskAlthough the Fund’s use of event-driven strategies may result in significant income and returns for the Fund, they involve a substantial degree of risk. This requires the sub-advisor to make predictions about the likelihood that an event will occur and the impact such event will have on the value of a company’s securities. If the event fails to occur or it does not have the effect foreseen, losses can result. In liquidations and other forms of corporate reorganization, the risk exists that the reorganization either will be unsuccessful, will be delayed or will result in a distribution of cash or a new security, the value of which will be less than the purchase price to the Fund of the investment in respect of which such distribution was made.Flexible Strategy RiskThe Fund uses a variety of investment strategies to achieve its investment objective. The sub-advisor does not attempt to keep the portfolio structure or the Fund’s performance consistent with any designated stock, bond or market index, and during times of market rallies, the Fund may not perform as well as other funds that seek to outperform an index. Over time, the investment performance of flexible strategies is typically substantially independent of longer term movements in the stock and bond market.Foreign Investing RiskNon-U.S. investments carry potential risks not associated with U.S. investments. Such risks include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity, (4) lack of uniform accounting, auditing and financial reporting standards, (5) greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays in transaction settlement in some foreign markets. The Fund’s investment in a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country. Global economic and financial markets are becoming increasingly interconnected and conditions (including recent volatility and instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.Hedging RiskIf the Fund uses a hedging instrument at the wrong time or judges the market conditions incorrectly, or the hedged instrument does not correlate to the risk sought to be hedged, the hedge might be unsuccessful, reduce the Fund’s return, or create a loss. In addition, hedges, even when successful in mitigating risk, may not prevent the Fund from experiencing losses on its investments. Hedging instruments may also reduce or eliminate gains that may otherwise have been available had the Fund not used the hedging instruments.High Portfolio Turnover RiskPortfolio turnover is a measure of the Fund’s trading activity over a one-year period. A portfolio turnover rate of 100% would indicate that the Fund sold and replaced the entire value of its securities holdings during the period. The Fund may engage in active and frequent trading and may have a high portfolio turnover rate, which could increase the Fund’s transaction costs, have a negative impact on performance, and generate higher capital gain distributions to shareholders than if the Fund had a lower portfolio turnover rate.High Yield Securities RiskExposure to high yield, below investment-grade securities (commonly referred to as “junk bonds”) generally involves significantly greater risks than an investment in investment grade securities. High yield debt securities may fluctuate more widely in price and yield and may fall in price when the economy is weak or expected to become weak. These securities also may be difficult to sell at the time and price the Fund desires. High yield securities are considered to be speculative with respect to an issuer’s ability to pay interest and principal and carry a greater risk that the issuers of lower-rated securities will default on the timely payment of principal and interest. High yield securities may experience greater price volatility and less liquidity than investment grade securities. Issuers of securities that are in default or have defaulted may fail to resume principal or interest payments, in which case the Fund may lose its entire investment.Interest Rate RiskGenerally, the value of investments with interest rate risk, such as fixed income securities or derivatives, will move in the opposite direction to movements in interest rates. The prices of fixed income securities or derivatives are also affected by their durations. Fixed income securities or derivatives with longer durations generally have greater sensitivity to changes in interest rates. For example, if a bond has a duration of four years, a 1% increase in interest rates could be expected to result in a 4% decrease in the value of the bond. An increase in interest rates can impact markets broadly as well. As of the date of this Prospectus, interest rates are historically low. Extremely low or negative interest rates may become more prevalent among U.S. and foreign issuers. To the extent the Fund holds an investment with a negative interest rate to maturity, the Fund would generate a negative return on that investment. Conversely, in the future, interest rates may rise, perhaps significantly and/or rapidly, potentially resulting in substantial losses to the Fund.Investment RiskAn investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.Issuer RiskThe value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.Large-Capitalization Companies RiskThe securities of large market capitalization companies may underperform other segments of the market because such companies may be less responsive to competitive challenges and opportunities. Many larger capitalization companies also may be unable to attain the high growth rates of successful smaller companies, especially during periods of economic expansion.Leverage RiskThe Fund’s use of derivative instruments and selling securities short may have the economic effect of financial leverage. Financial leverage magnifies the Fund’s exposure to the movements in prices of an asset or class of assets underlying a derivative instrument and may result in increased volatility, which means that the Fund will have the potential for greater losses than if the Fund does not use the derivative instruments that have a leveraging effect. Leverage may result in losses that exceed the amount originally invested and may accelerate the rate of losses. Leverage tends to magnify, sometimes significantly, the effect of any increase or decrease in the Fund’s exposure to an asset or class of assets and may cause the Fund’s net asset value (“NAV”) per share to be volatile. There can be no assurance that the Fund’s use of leverage will be successful.LIBOR Risk Certain of the instruments identified in the Fund’s principal investment strategies have variable or floating coupon rates that are based on the ICE LIBOR (“LIBOR”), Euro Interbank Offered Rate and other similar types of reference rates (each, a “Reference Rate”). These Reference Rates are generally intended to represent the rate at which contributing banks may obtain short-term borrowings from each other within certain financial markets. Arrangements are underway to phase out the use of LIBOR by the end of 2021. These arrangements and any additional regulatory or market changes may have an adverse impact on the Fund or its investments, including increased volatility or illiquidity in markets for instruments that rely on LIBOR. There remains uncertainty regarding the nature of any replacement rate and the impact of the transition from LIBOR on the Fund and the financial markets generally. The transition process, or the failure of an industry to transition, could lead to increased volatility and illiquidity in markets for instruments that currently rely on LIBOR to determine interest rates and a reduction in the values of some LIBOR-based investments, all of which would impact the Fund. At this time, it is not possible to completely identify or predict the effect of any transition, establishment of alternative Reference Rates or other reforms to Reference Rates that may be enacted in the UK or elsewhere. In addition, any substitute Reference Rate and any pricing adjustments imposed by a regulator or by counterparties or otherwise may adversely affect the Fund’s performance and/or NAV.Liquidity RiskThe Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices, or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Market prices for such instruments may be volatile. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund. For example, liquidity risk may be magnified in rising interest rate environments due to higher than normal redemption rates. Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs. Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.Market RiskThe Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. Equity securities generally have greater price volatility than fixed income securities, although under certain market conditions fixed income securities may have comparable or greater price volatility. During a general downturn in the securities markets, multiple assets may decline in value simultaneously. Prices in many financial markets have increased significantly over the last decade, but there have also been periods of adverse market and financial developments and cyclical change during that timeframe, which have resulted in unusually high levels of volatility in domestic and foreign financial markets that has caused losses for investors and may occur again in the future. The value of a security may decline due to adverse issuer-specific conditions, general market conditions unrelated to a particular issuer, or factors that affect a particular industry or industries. Changes in the financial condition of a single issuer or market segment also can impact the market as a whole. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, pandemics, public health crises, natural disasters and related events have led, and in the future may continue to lead, to instability in world economies and markets generally and reduced liquidity in equity, credit and fixed-income markets, which may disrupt economies and markets and adversely affect the value of your investment. Changes in value may be temporary or may last for extended periods. Policy changes by the U.S. government and/or Federal Reserve and political events within the U.S. and abroad, including the U.S. presidential election, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Markets and market participants are increasingly reliant upon both publicly available and proprietary information data systems. Data imprecision, software or other technology malfunctions, programming inaccuracies, unauthorized use or access, and similar circumstances may impair the performance of these systems and may have an adverse impact upon a single issuer, a group of issuers, or the market at large. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations.Recent Market Events. An outbreak of infectious respiratory illness caused by a novel coronavirus, known as COVID-19, was first detected in China in December 2019 and has subsequently spread globally. The transmission of COVID-19 and efforts to contain its spread have resulted, and may continue to result, in significant disruptions to business operations, widespread business closures and layoffs, travel restrictions and closed borders, prolonged quarantines and stay-at-home orders, disruption of and delays in healthcare service preparation and delivery, service and event changes, and lower consumer demand, as well as general concern and uncertainty that has negatively affected the global economy. The impact of the COVID-19 pandemic may last for an extended period of time and may result in a sustained economic downturn or recession. The U.S. Federal Reserve and the U.S. federal government have taken numerous measures to address the economic impact of the COVID-19 pandemic and stimulate the U.S. economy. The ultimate effects of these and other efforts that may be taken may not be known for some time.The Federal Reserve has spent hundreds of billions of dollars to keep credit flowing through short-term money markets and has signaled that it plans to maintain its interventions at an elevated level. Amid these ongoing efforts, concerns about the markets’ dependence on the Federal Reserve’s provision of liquidity have grown. The U.S. government has reduced the federal corporate income tax rate, and future legislative, regulatory and policy changes may result in more restrictions on international trade, less stringent prudential regulation of certain players in the financial markets, and significant new investments in infrastructure and national defense. High public debt in the U.S. and other countries creates ongoing systemic and market risks and policymaking uncertainty. A rise in protectionist trade policies, slowing global economic growth, risks associated with the United Kingdom’s departure from the European Union on January 31, 2020, commonly referred to as “Brexit,” and trade agreement negotiations during the transition period, the risks associated with ongoing trade negotiations with China, the possibility of changes to some international trade agreements, tensions or open conflict between nations, or political or economic dysfunction within some nations that are major producers of oil could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time.Economists and others have expressed increasing concern about the potential effects of global climate change on property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change, including on the demand for and the development of goods and services and related production costs, and the impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences of regulation or business trends driven by climate change.Market Timing RiskThe Fund is subject to the risk of market timing activities by investors due to the Fund’s investments in high yield and foreign securities, or its exposure to high yield, and foreign securities through the derivatives it holds. The limited trading activity of some high yield securities may result in market prices that do not reflect the true market value of these securities. If the Fund trades foreign securities, it generally prices these foreign securities using their closing prices from the foreign markets in which they trade, which typically is prior to the Fund’s calculation of its net asset value (“NAV”). These prices may be affected by events that occur after the close of a foreign market but before the Fund prices its shares. As a result, the Fund in certain instances may fair value high yield and foreign securities. However, some investors may engage in frequent short-term trading in the Fund to take advantage of any price differentials that may be reflected in the NAV of the Fund’s shares. Frequent trading by Fund shareholders poses risks to other shareholders in the Fund, including (i) the dilution of the Fund’s NAV, (ii) an increase in the Fund’s expenses, and (iii) interference with the portfolio managers’ ability to execute efficient investment strategies. While the Manager monitors trading in the Fund, there is no guarantee that it can detect all market timing activities.Mid-Capitalization Companies RiskInvesting in the securities of mid-capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger capitalization and more established companies. Since mid-capitalization companies may have narrower commercial markets and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity, and they can be particularly sensitive to changes in interest rates, borrowing costs and earnings.Other Investment Companies RiskTo the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund’s direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:BDCs. The Fund’s investments in business development companies (“BDCs”) may be subject to certain additional risks, including competition for limited investment opportunities, the liquidity of a BDC’s investments, uncertainty as to the value of a BDC’s investments, risks associated with access to capital and leverage, and reliance on the management of a BDC.ETFs. Because exchange-traded funds (“ETFs”) are listed on an exchange, they may be subject to trading halts, may trade at a premium or discount to their net asset value (“NAV”) and may not be liquid. An ETF that tracks an index may not precisely replicate the returns of that index, and an actively-managed ETF’s performance will reflect its adviser’s ability to make investment decisions that are suited to achieving the ETF’s investment objectives.Money Market Funds. Investments in money market funds are subject to interest rate risk, credit risk, and market risk.Pay-In-Kind Securities RiskPay-in-kind securities are debt securities that do not make regular cash interest payments. Pay-in-kind securities pay interest through the issuance of additional securities. Because these securities do not pay current cash income, their prices can be volatile when interest rates fluctuate. If an issuer of pay-in-kind securities defaults, the Fund may lose its entire investment. In order to continue to qualify for treatment as a “regulated investment company” under the Internal Revenue Code and avoid federal excise tax, the Fund may be required to distribute a portion of such non-cash income and may be required to dispose of other portfolio securities in order to generate cash to meet these distribution requirements, potentially during periods of adverse market prices.Redemption RiskThe Fund may experience periods of high levels of redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. The sale of assets to meet redemption requests may create net capital gains, which could cause the Fund to have to distribute substantial capital gains. Redemption risk is heightened during periods of declining or illiquid markets. During periods of heavy redemptions, the Fund may borrow funds through the interfund credit facility, or from a bank line of credit, which may increase costs. A rise in interest rates or other market developments may cause investors to move out of fixed income securities on a large scale. Heavy redemptions could hurt the Fund’s performance.Restricted Securities RiskSecurities not registered in the U.S. under the Securities Act of 1933, as amended (the “Securities Act”), or in non-U.S. markets pursuant to similar regulations, including “Section 4(a)(2)” securities and “Rule 144A” securities, are restricted as to their resale. Such securities may not be listed on an exchange and may have no active trading market. The prices of these securities may be more difficult to determine than publicly traded securities and these securities may involve heightened risk as compared to investments in securities of publicly traded companies. They may be more difficult to purchase or sell at an advantageous time or price because such securities may not be readily marketable in broad public markets, or may have to be held for a certain time period before they can be resold. The Fund may not be able to sell a restricted security when the sub-advisor considers it desirable to do so and/or may have to sell the security at a lower price than the Fund believes is its fair market value. In addition, transaction costs may be higher for restricted securities and the Fund may receive only limited information regarding the issuer of a restricted security. The Fund may have to bear the expense of registering restricted securities for resale and the risk of substantial delays in effecting the registration.Sector RiskWhen the Fund focuses its investments in certain sectors of the economy, its performance may be driven largely by sector performance and could fluctuate more widely than if the Fund were invested more evenly across sectors. Individual sectors may be more volatile, and may perform differently, than the broader market. As the Fund’s portfolio changes over time, the Fund’s exposure to a particular sector may become higher or lower.Financial Sector Risk. Financial services companies are subject to extensive governmental regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations.Securities Selection RiskSecurities selected by the sub-advisor for the Fund may not perform to expectations. It may not be possible to predict or to hedge against a widening in the yield of the securities selected by the sub-advisor. This could result in the Fund’s underperformance compared to its benchmark index(es), or other funds with similar investment objectives or strategies.Segregated Assets RiskIn connection with certain transactions that may give rise to future payment obligations, the Fund may be required to maintain a segregated amount of, or otherwise earmark, cash or liquid securities to cover the obligation. Segregated assets generally cannot be sold while the position they are covering is outstanding, unless they are replaced with other assets of equal value. The need to segregate cash or other liquid securities could limit the Fund’s ability to pursue other opportunities as they arise.Short Position RiskThe Fund will incur a loss as a result of a short position if the price of the instrument sold short increases in value between the date of the short sale and the date on which an offsetting position is purchased. Short positions may be considered speculative transactions and involve special risks, including greater reliance on the sub-advisor’s ability to accurately anticipate the future value of a security or instrument. As there is potentially no limit on the amount that the security that the Fund is required to purchase may have appreciated, the Fund’s losses are potentially unlimited in a short position transaction. The Fund may invest the proceeds of a short sale and, therefore, be subject to the effect of leverage, in that short selling may amplify changes in the Fund’s NAV since it may increase the exposure of the Fund to certain markets and may increase losses and the volatility of returns.Small Capitalization Companies RiskInvesting in the securities of small-capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger-capitalization and more established companies. Since small-capitalization companies may have narrower commercial markets, and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity and they can be particularly sensitive to changes in interest rates, borrowing costs and earnings.Special Purpose Acquisition Companies (“SPACs”) RiskThe Fund may invest in the common stock, warrants, and other securities of special purpose acquisition companies or similar special purpose entities (collectively, “SPACs”) that pool funds to seek potential acquisition opportunities. Because SPACs and similar entities have no operating history or ongoing business other than seeking acquisition opportunities, the value of their securities is dependent on the ability of the entity’s management to identify and complete a profitable acquisition. Unless and until an acquisition is completed, a SPAC generally invests its assets (less a portion retained to cover expenses) in income-producing investments, such as U.S. government securities and money market fund securities, and cash. To the extent the SPAC is invested in cash or similar securities, this may impact the Fund’s ability to meet its investment objective. If an acquisition that meets the requirements for the SPAC is not completed within a pre-established period of time, the invested funds are returned to the entity’s shareholders. Certain SPACs in which the Fund may invest, or the securities of an acquisition target, may not be registered under the Securities Act of 1933, as amended, or no public market may otherwise exist for such securities. Such investments in unregistered SPACs may have extended restrictions on their resale, be considered illiquid or otherwise involve a high degree of risk, which could cause the Fund to lose all or part of its investment.Trust Preferred Securities RiskTrust preferred securities are subject to market risk, interest rate risk and credit risk. Holders of the trust preferred securities have limited voting rights to control the activities of the trust and no voting rights with respect to the parent company. Trust preferred securities prices fluctuate for several reasons, including changes in the financial condition of an issuer, investors’ perception of the financial condition of an issuer, or the general economic condition of the market for trust preferred securities.Unrated Securities RiskBecause the Fund may purchase securities that are not rated by any rating organization, the sub-advisor, after assessing their credit quality, may internally assign ratings to certain of those securities in categories similar to those of rating organizations. Unrated securities are subject to the risk that the sub-advisor may not accurately evaluate the security’s comparative credit rating. Some unrated securities may not have an active trading market or may be difficult to value, which means the Fund might have difficulty selling them promptly at an acceptable price. Unrated securities may be subject to greater liquidity risk and price volatility.Variable and Floating Rate Securities RiskThe coupons on variable and floating-rate securities are not fixed and may fluctuate based upon changes in market rates. A variable rate security has a coupon that is adjusted at pre-designated periods in response to changes in the market rate of interest on which the interest rate is based. The coupon on a floating rate security is generally based on an interest rate, such as a money-market index, LIBOR or a Treasury bill rate. Variable and floating rate securities are subject to interest rate risk and credit risk. As short-term interest rates decline, the coupons on variable and floating-rate securities typically decrease. Alternatively, during periods of rising short-term interest rates, the coupons on variable and floating-rate securities typically increase. Changes in the coupons of variable and floating-rate securities may lag behind changes in market rates or may have limits on the maximum increases in the coupon rates. The value of variable and floating-rate securities may decline if their coupons do not rise as much, or as quickly, as interest rates in general. Conversely, variable and floating rate securities will not generally increase in value if interest rates decline. Certain types of variable and floating rate instruments may be subject to greater liquidity risk than other debt securities.Zero Coupon Securities RiskZero coupon securities are securities that do not make periodic interest payments. Accordingly, zero coupon securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations in market value in response to changing interest rates than debt obligations of comparable maturities that make current distribution of interest in cash.

Risk Not Insured Depository Institution [Text]

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An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Narrative [Text Block]

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The bar chart and table below provide an indication of risk by showing changes in the Fund’s performance over time. The bar chart shows how the Fund’s performance has varied from year to year. The table shows how the Fund’s performance compares to a broad-based market index, which is the Fund’s benchmark index.The Fund acquired the assets and liabilities of the Palmer Square SSI Alternative Income Fund, a series of Investment Managers Series Trust, in a reorganization that closed on May 17, 2019. In connection with that reorganization, the Y Class shares and Investor Class shares of the Fund have adopted the performance history and financial statements of the Class I shares and Class A shares, respectively, of the Fund’s predecessor. The bar chart and table below show the performance of the Fund’s Y Class shares for all periods. The table below also shows the performance of the Fund’s Investor Class shares for all periods. The performance of the Fund’s Investor Class shares differs from the performance of the Class A shares of the Fund’s predecessor to the extent that the performance of the Class A shares reflected the deduction of applicable sales charges. The R5 Class shares of the Fund began operations on May 20, 2019. In the table below, the performance for the R5 Class shares for periods prior to May 20, 2019 represents the returns of the predecessor Fund’s Class I shares. The R5 Class shares would have had similar annual returns to the Class I shares, because the shares of each class are invested in the same portfolio securities. However, the Class I shares of the Fund’s predecessor had different expenses than the R5 Class shares, which would affect performance. The R5 Class performance shown in the table has not been adjusted for differences in operating expenses of the R5 Class and the predecessor Fund’s I Class shares.You may obtain updated performance information on the Fund’s website at www.americanbeaconfunds.com. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Availability Website Address [Text]

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www.americanbeaconfunds.com

Bar Chart [Heading]

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Calendar year total returns for Y Class Shares. Year Ended 12/31

Performance Table Not Relevant to Tax Deferred

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If you are a tax-exempt entity or hold your Fund shares through a tax-deferred arrangement, such as an individual retirement account (“IRA”) or a 401(k) plan, the after-tax returns do not apply to your situation.

Performance Table Explanation after Tax Higher

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The return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

Performance Table Heading

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Average annual total returns for periods ended December 31, 2019

Objective [Heading]

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Investment Objective

Expense [Heading]

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Fees and Expenses of the Fund

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

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October 31, 2021

Expense Example [Heading]

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Example

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover, Rate

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59.00%

Strategy Narrative [Text Block]

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Under normal circumstances, at least 80% of the Fund’s net assets (plus the amount of any borrowings for investment purposes) are invested in equity securities. The Fund will invest primarily in U.S. common stocks. The Fund seeks to achieve its investment objective by investing primarily in the common stock of companies that the Fund’s investment sub-advisor, Shapiro Capital Management LLC (“Shapiro”), believes are priced below intrinsic value. Shapiro defines intrinsic value as the price at which a strategic or financial buyer would be willing to buy the entire company. Shapiro uses several different metrics to arrive at intrinsic value including, but not limited to, price to cash flow, price to sales and free cash flow yield. The Fund may invest in companies of all market capitalizations.Shapiro seeks to achieve the Fund’s investment objective by implementing a research intensive fundamental process to select a focused portfolio of approximately 20 – 35 common stocks. Shapiro uses this investment approach to identify companies with substantial operations, a high return on invested assets, products or services with a minimized chance of obsolescence and franchise-like characteristics with significant barriers to entry, and sound management with equity interest in the company.The Fund may also invest cash balances in other investment companies, including money market funds managed by the Manager.The Fund may seek to earn additional income by lending its securities to certain qualified broker-dealers and institutions on a short-term or long-term basis.The Fund is non-diversified, which means that it is not limited to a percentage of assets that it may invest in any one issuer and may focus its investments in fewer issuers than a fund with a diversified portfolio.

Risk Narrative [Text Block]

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There is no assurance that the Fund will achieve its investment objective and you could lose part or all of your investment in the Fund. The Fund is not designed for investors who need an assured level of current income and is intended to be a long-term investment. The Fund is not a complete investment program and may not be appropriate for all investors. Investors should carefully consider their own investment goals and risk tolerance before investing in the Fund. The principal risks of investing in the Fund listed below are presented in alphabetical order and not in order of importance or potential exposure. Among other matters, this presentation is intended to facilitate your ability to find particular risks and compare them with the risks of other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears.Cybersecurity and Operational RiskOperational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund and its service providers as well as the ability of shareholders to transact with the Fund. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. Most issuers in which the Fund invests are heavily dependent on computers for data storage and operations, and require ready access to the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of securities in which the Fund invests, leading to significant loss of value.Equity Investments RiskEquity securities are subject to investment risk and market risk. The Fund may invest in the following equity securities, which may expose the Fund to the following additional risks:Common Stock Risk. The value of a company’s common stock may fall as a result of factors affecting the company, companies in the same industry or sector, or the financial markets overall. Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company.Focused Holdings RiskBecause the Fund may have a focused portfolio of fewer companies than diversified funds, the increase or decrease of the value of a single investment may have a greater impact on the Fund’s net asset value (“NAV”) and total return when compared to diversified funds.Investment RiskAn investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.Issuer RiskThe value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.Large-Capitalization Companies RiskThe securities of large market capitalization companies may underperform other segments of the market because such companies may be less responsive to competitive challenges and opportunities. Many larger capitalization companies also may be unable to attain the high growth rates of successful smaller companies, especially during periods of economic expansion.Liquidity RiskThe Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices, or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund. For example, liquidity risk may be magnified in rising interest rate environments in the event of higher than normal redemption rates. Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs. Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.Market RiskThe Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. Equity securities generally have greater price volatility than fixed income securities, although under certain market conditions fixed income securities may have comparable or greater price volatility. During a general downturn in the securities markets, multiple assets may decline in value simultaneously. Prices in many financial markets have increased significantly over the last decade, but there have also been periods of adverse market and financial developments and cyclical change during that timeframe, which have resulted in unusually high levels of volatility in domestic and foreign financial markets that has caused losses for investors and may occur again in the future. The value of a security may decline due to adverse issuer-specific conditions, general market conditions unrelated to a particular issuer, or factors that affect a particular industry or industries. Changes in the financial condition of a single issuer or market segment also can impact the market as a whole. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, pandemics, public health crises, natural disasters and related events have led, and in the future may continue to lead, to instability in world economies and markets generally and reduced liquidity in equity, credit and fixed-income markets, which may disrupt economies and markets and adversely affect the value of your investment. Changes in value may be temporary or may last for extended periods. Policy changes by the U.S. government and/or Federal Reserve and political events within the U.S. and abroad, including the U.S. presidential election, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Markets and market participants are increasingly reliant upon both publicly available and proprietary information data systems. Data imprecision, software or other technology malfunctions, programming inaccuracies, unauthorized use or access, and similar circumstances may impair the performance of these systems and may have an adverse impact upon a single issuer, a group of issuers, or the market at large. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations.Recent Market Events. An outbreak of infectious respiratory illness caused by a novel coronavirus, known as COVID-19, was first detected in China in December 2019 and has subsequently spread globally. The transmission of COVID-19 and efforts to contain its spread have resulted, and may continue to result, in significant disruptions to business operations, widespread business closures and layoffs, travel restrictions and closed borders, prolonged quarantines and stay-at-home orders, disruption of and delays in healthcare service preparation and delivery, service and event changes, and lower consumer demand, as well as general concern and uncertainty that has negatively affected the global economy. The impact of the COVID-19 pandemic may last for an extended period of time and may result in a sustained economic downturn or recession. The U.S. Federal Reserve and the U.S. federal government have taken numerous measures to address the economic impact of the COVID-19 pandemic and stimulate the U.S. economy. The ultimate effects of these and other efforts that may be taken may not be known for some time.The Federal Reserve has spent hundreds of billions of dollars to keep credit flowing through short-term money markets and has signaled that it plans to maintain its interventions at an elevated level. Amid these ongoing efforts, concerns about the markets’ dependence on the Federal Reserve’s provision of liquidity have grown. The U.S. government has reduced the federal corporate income tax rate, and future legislative, regulatory and policy changes may result in more restrictions on international trade, less stringent prudential regulation of certain players in the financial markets, and significant new investments in infrastructure and national defense. High public debt in the U.S. and other countries creates ongoing systemic and market risks and policymaking uncertainty. A rise in protectionist trade policies, slowing global economic growth, risks associated with the United Kingdom’s departure from the European Union on January 31, 2020, commonly referred to as “Brexit,” and trade agreement negotiations during the transition period, the risks associated with ongoing trade negotiations with China, the possibility of changes to some international trade agreements, tensions or open conflict between nations, or political or economic dysfunction within some nations that are major producers of oil could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time.Economists and others have expressed increasing concern about the potential effects of global climate change on property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change, including on the demand for and the development of goods and services and related production costs, and the impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences of regulation or business trends driven by climate change.Mid-Capitalization Companies RiskInvesting in the securities of mid-capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger capitalization and more established companies. Since mid-capitalization companies may have narrower commercial markets and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity, and they can be particularly sensitive to changes in interest rates, borrowing costs and earnings.Non-Diversification RiskThe Fund is non-diversified, which means it may focus its investments in the securities of a comparatively small number of issuers. Investments in securities of a limited number of issuers exposes the Fund to greater market risk, price volatility and potential losses than if assets were diversified among the securities of a greater number of issuers.Other Investment Companies RiskTo the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund’s direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:Money Market Funds. Investments in money market funds are subject to interest rate risk, credit risk, and market risk.Securities Lending RiskTo the extent the Fund lends its securities, it may be subject to the following risks: i) the securities in which the Fund reinvests cash collateral may decrease in value, causing the Fund to incur a loss, or may not perform sufficiently to cover the Fund’s payment to the borrower of a pre-negotiated fee or “rebate” for the use of that cash collateral in connection with the loan; ii) non-cash collateral may decline in value, resulting in the Fund becoming under-secured; iii) delays may occur in the recovery of loaned securities from borrowers, which could result in the Fund being unable to vote proxies or settle transactions or cause the Fund to incur increased costs; and iv) if the borrower becomes subject to insolvency or similar proceedings, the Fund could incur delays in its ability to enforce its rights in its collateral.Securities Selection RiskSecurities selected by the sub-advisor for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to its benchmark index(es), or other funds with similar investment objectives or strategies.Small Capitalization Companies RiskInvesting in the securities of small-capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger-capitalization and more established companies. Since small-capitalization companies may have narrower commercial markets, and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity and they can be particularly sensitive to changes in interest rates, borrowing costs and earnings.Value Stocks RiskValue stocks are subject to the risk that their intrinsic value may never be realized by the market or that their prices may decline. The Fund’s investments in value stocks seek to limit potential downside price risk over time; however, value stock prices still may decline substantially. In addition, the Fund may produce more modest gains as a trade-off for this potentially lower risk. The Fund’s investment in value stocks could cause the Fund to underperform funds that use a growth or non-value approach to investing or have a broader investment style.

Risk Nondiversified Status [Text]

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Non-Diversification RiskThe Fund is non-diversified, which means it may focus its investments in the securities of a comparatively small number of issuers. Investments in securities of a limited number of issuers exposes the Fund to greater market risk, price volatility and potential losses than if assets were diversified among the securities of a greater number of issuers.

Bar Chart and Performance Table [Heading]

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Fund Performance

Performance Information Illustrates Variability of Returns [Text]

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The bar chart and table below provide an indication of risk by showing changes in the Fund’s performance over time. The bar chart shows how the Fund’s performance has varied from year to year. The table shows how the Fund’s average annual total returns compare to a broad-based market index, which is the Fund’s benchmark index, for the periods indicated.

Performance Past Does Not Indicate Future [Text]

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Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local income taxes.

Performance Table One Class of after Tax Shown [Text]

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After-tax returns are shown only for Investor Class shares of the Fund; after-tax returns for other share classes will vary.

Bar Chart Closing [Text Block]

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Highest Quarterly Return:14.79%1st Quarter 201901/01/2018 through 12/31/2019Lowest Quarterly Return:-18.92%4th Quarter 201801/01/2018 through 12/31/2019The calendar year-to-date total return as of September 30, 2020 was -7.08%.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local income taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. If you are a tax-exempt entity or hold your Fund shares through a tax-deferred arrangement, such as an individual retirement account (“IRA”) or a 401(k) plan, the after-tax returns do not apply to your situation. After-tax returns are shown only for Investor Class shares of the Fund; after-tax returns for other share classes will vary.

Prospectus:

rr_ProspectusTable

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is long-term capital appreciation.

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. More information is available from your financial professional and in “Choosing Your Share Class” on page 40 of the Prospectus. Although the Fund does not impose any sales charge on Y Class shares, you may pay a commission to your broker on your purchases and sales of those shares, which is not reflected in the tables or Example below.

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

48.00%

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, at least 80% of the Fund’s net assets (plus the amount of any borrowings for investment purposes) are invested in equity securities of small- and mid-capitalization companies. The Fund considers a company to be a small- to mid-capitalization company if it has a market capitalization (stock market worth), at the time of investment, between $1 billion and the market capitalization of the largest company in the Russell 2500® Index, which was $18.9 billion as of August 31, 2020.The Fund will invest primarily in U.S. common stocks. Although the Fund will invest principally in small- and mid-capitalization companies, the Fund may invest in companies of all market capitalizations, including large-capitalization companies.The Fund’s investment sub-advisor, Shapiro Capital Management LLC (“Shapiro”), seeks to achieve the Fund’s investment objective by implementing an intensive fundamental research process to select a focused portfolio of approximately 20 – 35 stocks. Shapiro uses this investment approach to identify companies with substantial operations, a high return on invested assets, products or services with a minimized chance of obsolescence and franchise-like characteristics with significant barriers to entry, and sound management with equity interest in the company. The Fund may have significant exposure to the Materials sector. However, as the sector composition of the Fund’s portfolio changes over time, the Fund’s exposure to the Materials sector may be lower at a future date, and the Fund’s exposure to other market sectors may be higher.The Fund may invest cash balances in other investment companies, including money market funds managed by the Manager.The Fund may seek to earn additional income by lending its securities to certain qualified broker-dealers and institutions on a short-term or long-term basis.The Fund is non-diversified, which means that it is not limited to a percentage of assets that it may invest in any one issuer and may focus its investments in fewer issuers than a fund with a diversified portfolio.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

There is no assurance that the Fund will achieve its investment objective and you could lose part or all of your investment in the Fund. The Fund is not designed for investors who need an assured level of current income and is intended to be a long-term investment. The Fund is not a complete investment program and may not be appropriate for all investors. Investors should carefully consider their own investment goals and risk tolerance before investing in the Fund. The principal risks of investing in the Fund listed below are presented in alphabetical order and not in order of importance or potential exposure. Among other matters, this presentation is intended to facilitate your ability to find particular risks and compare them with the risks of other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears.Cybersecurity and Operational RiskOperational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund and its service providers as well as the ability of shareholders to transact with the Fund. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. Most issuers in which the Fund invests are heavily dependent on computers for data storage and operations, and require ready access to the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of securities in which the Fund invests, leading to significant loss of value.Equity Investments RiskEquity securities are subject to investment risk and market risk. The Fund may invest in the following equity securities, which may expose the Fund to the following additional risks:Common Stock Risk. The value of a company’s common stock may fall as a result of factors affecting the company, companies in the same industry or sector, or the financial markets overall. Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company.Focused Holdings RiskBecause the Fund may have a focused portfolio of fewer companies than diversified funds, the increase or decrease of the value of a single investment may have a greater impact on the Fund’s net asset value (“NAV”) and total return when compared to diversified funds.Investment RiskAn investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.Issuer RiskThe value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.Large-Capitalization Companies RiskThe securities of large market capitalization companies may underperform other segments of the market because such companies may be less responsive to competitive challenges and opportunities. Many larger capitalization companies also may be unable to attain the high growth rates of successful smaller companies, especially during periods of economic expansion.Liquidity RiskThe Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices, or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund. For example, liquidity risk may be magnified in rising interest rate environments in the event of higher than normal redemption rates. Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs. Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.Market RiskThe Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. Equity securities generally have greater price volatility than fixed income securities, although under certain market conditions fixed income securities may have comparable or greater price volatility. During a general downturn in the securities markets, multiple assets may decline in value simultaneously. Prices in many financial markets have increased significantly over the last decade, but there have also been periods of adverse market and financial developments and cyclical change during that timeframe, which have resulted in unusually high levels of volatility in domestic and foreign financial markets that has caused losses for investors and may occur again in the future. The value of a security may decline due to adverse issuer-specific conditions, general market conditions unrelated to a particular issuer, or factors that affect a particular industry or industries. Changes in the financial condition of a single issuer or market segment also can impact the market as a whole. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, pandemics, public health crises, natural disasters and related events have led, and in the future may continue to lead, to instability in world economies and markets generally and reduced liquidity in equity, credit and fixed-income markets, which may disrupt economies and markets and adversely affect the value of your investment. Changes in value may be temporary or may last for extended periods. Policy changes by the U.S. government and/or Federal Reserve and political events within the U.S. and abroad, including the U.S. presidential election, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Markets and market participants are increasingly reliant upon both publicly available and proprietary information data systems. Data imprecision, software or other technology malfunctions, programming inaccuracies, unauthorized use or access, and similar circumstances may impair the performance of these systems and may have an adverse impact upon a single issuer, a group of issuers, or the market at large. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations.Recent Market Events. An outbreak of infectious respiratory illness caused by a novel coronavirus, known as COVID-19, was first detected in China in December 2019 and has subsequently spread globally. The transmission of COVID-19 and efforts to contain its spread have resulted, and may continue to result, in significant disruptions to business operations, widespread business closures and layoffs, travel restrictions and closed borders, prolonged quarantines and stay-at-home orders, disruption of and delays in healthcare service preparation and delivery, service and event changes, and lower consumer demand, as well as general concern and uncertainty that has negatively affected the global economy. The impact of the COVID-19 pandemic may last for an extended period of time and may result in a sustained economic downturn or recession. The U.S. Federal Reserve and the U.S. federal government have taken numerous measures to address the economic impact of the COVID-19 pandemic and stimulate the U.S. economy. The ultimate effects of these and other efforts that may be taken may not be known for some time.The Federal Reserve has spent hundreds of billions of dollars to keep credit flowing through short-term money markets and has signaled that it plans to maintain its interventions at an elevated level. Amid these ongoing efforts, concerns about the markets’ dependence on the Federal Reserve’s provision of liquidity have grown. The U.S. government has reduced the federal corporate income tax rate, and future legislative, regulatory and policy changes may result in more restrictions on international trade, less stringent prudential regulation of certain players in the financial markets, and significant new investments in infrastructure and national defense. High public debt in the U.S. and other countries creates ongoing systemic and market risks and policymaking uncertainty. A rise in protectionist trade policies, slowing global economic growth, risks associated with the United Kingdom’s departure from the European Union on January 31, 2020, commonly referred to as “Brexit,” and trade agreement negotiations during the transition period, the risks associated with ongoing trade negotiations with China, the possibility of changes to some international trade agreements, tensions or open conflict between nations, or political or economic dysfunction within some nations that are major producers of oil could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time.Economists and others have expressed increasing concern about the potential effects of global climate change on property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change, including on the demand for and the development of goods and services and related production costs, and the impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences of regulation or business trends driven by climate change.Micro-Capitalization Companies RiskMicro-capitalization companies are subject to substantially greater risks of loss and price fluctuations because their earnings and revenues tend to be less predictable. Since micro-capitalization companies may not have an operating history, product lines, or financial resources, their share prices tend to be more volatile and their markets less liquid than companies with larger market capitalizations, and they can be sensitive to expected changes in interest rates, borrowing costs and earnings. The shares of micro-capitalization companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the future ability to sell these securities.Mid-Capitalization Companies RiskInvesting in the securities of mid-capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger capitalization and more established companies. Since mid-capitalization companies may have narrower commercial markets and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity, and they can be particularly sensitive to changes in interest rates, borrowing costs and earnings.Non-Diversification RiskThe Fund is non-diversified, which means it may focus its investments in the securities of a comparatively small number of issuers. Investments in securities of a limited number of issuers exposes the Fund to greater market risk, price volatility and potential losses than if assets were diversified among the securities of a greater number of issuers.Other Investment Companies RiskTo the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund’s direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:Money Market Funds. Investments in money market funds are subject to interest rate risk, credit risk, and market risk.Sector RiskWhen the Fund focuses its investments in certain sectors of the economy, its performance may be driven largely by sector performance and could fluctuate more widely than if the Fund were invested more evenly across sectors. Individual sectors may be more volatile, and may perform differently, than the broader market. As the Fund’s portfolio changes over time, the Fund’s exposure to a particular sector may become higher or lower.Materials Sector Risk. Companies in the materials sector may be affected by commodity production and prices, consumer preferences, interest rates, exchange rates, product cycles, marketing, import controls, increased competition and resource depletion, among other factors. The materials sector may also be affected by economic cycles, technical progress, labor relations, environmental policies and government regulations.Securities Lending RiskTo the extent the Fund lends its securities, it may be subject to the following risks: i) the securities in which the Fund reinvests cash collateral may decrease in value, causing the Fund to incur a loss, or may not perform sufficiently to cover the Fund’s payment to the borrower of a pre-negotiated fee or “rebate” for the use of that cash collateral in connection with the loan; ii) non-cash collateral may decline in value, resulting in the Fund becoming under-secured; iii) delays may occur in the recovery of loaned securities from borrowers, which could result in the Fund being unable to vote proxies or settle transactions or cause the Fund to incur increased costs; and iv) if the borrower becomes subject to insolvency or similar proceedings, the Fund could incur delays in its ability to enforce its rights in its collateral.Securities Selection RiskSecurities selected by the sub-advisor for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to its benchmark index(es), or other funds with similar investment objectives or strategies.Small Capitalization Companies RiskInvesting in the securities of small-capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger-capitalization and more established companies. Since small-capitalization companies may have narrower commercial markets, and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity and they can be particularly sensitive to changes in interest rates, borrowing costs and earnings.Value Stocks RiskValue stocks are subject to the risk that their intrinsic value may never be realized by the market or that their prices may decline. The Fund’s investments in value stocks seek to limit potential downside price risk over time; however, value stock prices still may decline substantially. In addition, the Fund may produce more modest gains as a trade-off for this potentially lower risk. The Fund’s investment in value stocks could cause the Fund to underperform funds that use a growth or non-value approach to investing or have a broader investment style.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Non-Diversification RiskThe Fund is non-diversified, which means it may focus its investments in the securities of a comparatively small number of issuers. Investments in securities of a limited number of issuers exposes the Fund to greater market risk, price volatility and potential losses than if assets were diversified among the securities of a greater number of issuers.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table below provide an indication of risk by showing changes in the Fund’s performance over time. The bar chart shows how the Fund’s performance has varied from year to year. The table shows how the Fund’s average annual total returns compare to a broad-based market index, which is the Fund’s benchmark index, for the periods indicated.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local income taxes.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown only for Investor Class shares of the Fund; after-tax returns for other share classes will vary.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:14.82%1st Quarter 201901/01/2018 through 12/31/2019Lowest Quarterly Return:-22.71%4th Quarter 201801/01/2018 through 12/31/2019The calendar year-to-date total return as of September 30, 2020 was -16.84%.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local income taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. If you are a tax-exempt entity or hold your Fund shares through a tax-deferred arrangement, such as an individual retirement account (“IRA”) or a 401(k) plan, the after-tax returns do not apply to your situation. After-tax returns are shown only for Investor Class shares of the Fund; after-tax returns for other share classes will vary.

Prospectus:

rr_ProspectusTable

Since Inception

rr_AverageAnnualReturnSinceInception

9.69%

^[1]

Prospectus:

rr_ProspectusTable

Since Inception

rr_AverageAnnualReturnSinceInception

6.97%

^[2]

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

1.07%

1 Year

rr_AverageAnnualReturnYear01

31.02%

1 Year

rr_AverageAnnualReturnYear01

27.77%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.70%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.39%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.10%

^[3]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

0.90%

^[5]

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

330

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,322

Since Inception

rr_AverageAnnualReturnSinceInception

10.81%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.75%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

2.58%

^[6]

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(2.33%)

^[7]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 102

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,534

1 Year

rr_AverageAnnualReturnYear01

26.36%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 12, 2017

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (as a percentage)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Component2 Other Expenses

rr_Component2OtherExpensesOverAssets

0.31%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[10]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 232

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,246

Annual Return 2013

rr_AnnualReturn2013

2.34%

Annual Return 2015

rr_AnnualReturn2015

(2.39%)

Annual Return 2017

rr_AnnualReturn2017

4.35%

Annual Return 2019

rr_AnnualReturn2019

6.60%

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.92%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return: 3.18 % 2nd Quarter 2016 01/01/2013 through 12/31/2019

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2016

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(2.03%)

1 Year

rr_AverageAnnualReturnYear01

6.60%

Since Inception

rr_AverageAnnualReturnSinceInception

2.43%

1 Year

rr_AverageAnnualReturnYear01

5.25%

Since Inception

rr_AverageAnnualReturnSinceInception

1.73%

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

1.96%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.70%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.27%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.98%

^[3]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

0.80%

^[5]

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

294

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,185

Since Inception

rr_AverageAnnualReturnSinceInception

10.85%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.75%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

2.47%

^[6]

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(2.32%)

^[7]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 92

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,481

1 Year

rr_AverageAnnualReturnYear01

26.45%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 12, 2017

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (as a percentage)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Component2 Other Expenses

rr_Component2OtherExpensesOverAssets

2.90%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(2.71%)

^[10]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 224

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,250

1 Year

rr_AverageAnnualReturnYear01

6.65%

Since Inception

rr_AverageAnnualReturnSinceInception

2.43%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.70%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

1.50%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.21%

^[3]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.07%

^[5]

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

581

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 2,455

Annual Return 2019

rr_AnnualReturn2019

29.56%

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(7.08%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:14.79%1st Quarter 201901/01/2018 through 12/31/2019

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2019

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.92%)

1 Year

rr_AverageAnnualReturnYear01

29.56%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 12, 2017

Prospectus:

rr_ProspectusTable

Since Inception

rr_AverageAnnualReturnSinceInception

9.21%

Prospectus:

rr_ProspectusTable

Since Inception

rr_AverageAnnualReturnSinceInception

7.68%

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (as a percentage)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.86%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.19%

^[8]

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

932

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 3,918

Annual Return 2019

rr_AnnualReturn2019

25.97%

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(16.84%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:14.82%1st Quarter 201901/01/2018 through 12/31/2019

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2019

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.71%)

1 Year

rr_AverageAnnualReturnYear01

25.97%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 12, 2017

Prospectus:

rr_ProspectusTable

Since Inception

rr_AverageAnnualReturnSinceInception

3.34%

Prospectus:

rr_ProspectusTable

Since Inception

rr_AverageAnnualReturnSinceInception

3.55%

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (as a percentage)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Component2 Other Expenses

rr_Component2OtherExpensesOverAssets

0.96%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.45%)

^[10]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 257

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,533

1 Year

rr_AverageAnnualReturnYear01

6.32%

Since Inception

rr_AverageAnnualReturnSinceInception

2.18%