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Arbitrage Tactical Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Arbitrage Tactical Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks to achieve capital appreciation.
Expense [Heading] rr_ExpenseHeading Fund Fees and Expenses
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. You may qualify for sales charge discounts on Class A Shares if you and your family invest, or agree to invest in the future, at least $100,000 in the Fund. More information about these and other discounts is available from your financial professional and in "How to Purchase Shares" beginning on page 48 of the statutory prospectus and in Appendix A to the prospectus, titled "Intermediary-Specific Sales Charge Reductions and Waivers."
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Sep. 30, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During its most recent fiscal year, the Fund's portfolio turnover rate was 520% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 520.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses in this fee table do not correlate to the expense ratio in the Financial Highlights because the expense ratios in the Financial Highlights do not reflect Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's expenses are equal to the Total Annual Fund Operating Expenses After Fee Waiver for the first year and equal to Total Annual Fund Operating Expenses for the remaining years. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund seeks to profit from investing in securities of companies whose stock price trades significantly higher or lower from where the investment adviser (the "Adviser") believes it should trade. The Adviser believes such differences may occur when news and events create misperception of a company's correct stock price. Examples of such news and events, which the Fund refers to as "investment opportunities," include, but are not limited to: changes in industry or sector fundamentals, announcements or potential announcements of restructurings (bankruptcies, spinoffs, and asset sales), mergers and acquisitions, earnings results and outlook, regulatory changes and litigation. The Adviser's investment approach is to identify these differences and to tactically purchase or sell short such securities in order to achieve the Fund's objective. The Fund may engage in active and frequent trading of portfolio securities to achieve its investment objective. In certain circumstances, the Adviser may seek to proactively engage with company management to address opportunities that may further unlock value or discuss concerns.


In order to meet its investment objective, the Fund will invest in a portfolio of securities including: equities, debt (such as corporate bonds, debentures, notes and other similar instruments), warrants, distressed, high-yield (these are referred to as junk bonds), convertible, preferred, when-issued, and other securities the Adviser believes will further its investment objective. The Fund may also invest in derivatives. The principal types of derivatives in which the Fund may invest are options, total return swaps, credit default swaps, credit default indexes, currency forwards, and futures. Furthermore, the Fund may invest in instruments, such as exchange traded funds ("ETFs"), exchange traded notes ("ETNs") and commodities. Under normal circumstances, the Fund invests at least 80% of the value of its net assets (including borrowings for investment purposes) in equity securities, such as common stock, preferred stock and securities convertible into such stock, and other instruments that have economic characteristics similar to equity securities. The Adviser expects the Fund's assets to be invested in various industries; however, if, for example, a large percentage (namely, at least 50%) of investment opportunities are occurring within the U.S. are within one industry over a given period of time, a large portion of the Fund's assets could be concentrated in that industry for that period of time.


The Fund is not limited with respect to issuer, geography, market capitalization, credit quality, sector or industry and the Fund is non-diversified as defined by the Investment Company Act of 1940, as amended (the "1940 Act"). In addition, the Fund may invest in cash or cash equivalents, money market funds, or money market instruments such as Treasury bills and other short-term obligations of the United States Government, its agencies or instrumentalities and prime commercial paper. The Fund may, but is not required to, seek to reduce currency risk by hedging part or all of its exposure to various foreign currencies.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with all mutual funds, investing in the Fund entails risks that could cause the Fund and you to lose money. The principal risks of investing in the Fund are as follows:


Active Management Risk: The Fund is an actively managed investment portfolio and is therefore subject to management risk. The Adviser will apply its investment and risk analysis in making investment decisions for the Fund, but there is no guarantee that these decisions will produce the intended results.


Concentration Risk: The Adviser expects the Fund's assets to be invested in various industries; however, if, for example, a large percentage of corporate events taking place within the U.S. are within one industry over a given period of time, a large portion of the Fund's assets could be concentrated in that industry for that period of time. During such a period of concentration, the Fund may be subject to greater volatility and with respect to portfolio securities than a fund that is more broadly diversified.


Counterparty Risk: The Fund may enter into various types of derivative contracts. These derivative contracts may be privately negotiated in the over-the-counter market. These contracts also involve exposure to credit risk, since contract performance depends in part on the financial condition of the counterparty. If a privately negotiated over-the-counter contract calls for payments by the Fund, the Fund must be prepared to make such payments when due. In addition, if the creditworthiness of the counterparty declines, the Fund may not receive payments owed under the contract, or such payments may be delayed and the value of agreements with the counterparty can be expected to decline, potentially resulting in losses to the Fund.


Credit Risks: Credit risk refers to the possibility that the issuer of the security will not be able to make interest or principal payments when due. The Fund may invest in convertible and non-convertible debt securities, including high yield debt securities, also known as "junk bonds." Investments in junk bonds are subject to greater credit risks than securities with credit ratings above investment grade and have a greater risk of default than investment grade debt securities. Junk bonds are less sensitive to interest rate changes than higher credit quality instruments and generally are more sensitive to adverse economic changes or individual corporate developments.


Currency Risks: Fluctuations in exchange rates between the U.S. dollar and foreign currencies may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign currency denominated investments and may widen any losses. Currency forward/futures contracts also may deny the Fund from realizing gains from an increase in the value of the currency. In addition to currency risk, currency forward/futures contracts, like other derivatives, may be susceptible to credit risk and other risks.


Derivatives Risk: In general, a derivative instrument typically involves leverage and provides exposure to potential gain or loss from a change in the market price of the underlying asset (or a basket of assets or an index) in a notional amount that exceeds the amount of cash or assets required to establish or maintain the derivative instrument. Adverse changes in the value or price of the underlying asset (or basket of assets or index), which the Fund may not directly own, can result in a loss to the Fund substantially greater than the amount invested in the derivative itself. The use of derivative instruments also exposes the Fund to additional risks and transaction costs. Derivative instruments come in many varieties and may include forward contracts, options (both written and purchased) and swap contracts.


ETF Risk: Unlike shares of traditional mutual funds, shares of ETFs are listed and traded on securities exchanges and in over-the-counter markets, and the purchase and sale of these shares involve transaction fees and commissions. In addition, shares of an ETF are issued in "creation units" and are not redeemable individually except upon termination of the ETF. To redeem, a Fund must accumulate enough shares of an ETF to reconstitute a creation unit. The liquidity of a small holding of an ETF, therefore, will depend upon the existence of a secondary market. Also, even though the market price of an ETF is derived from the securities it owns, such price at any given time may be at, below or above the ETF's NAV.


ETN Risk: ETNs are unsecured debt obligations of financial institutions that trade on a securities exchange. ETN payment terms are linked to the performance of a reference index or benchmark, representing the ETN's investment objective. They are different from traditional corporate bonds in that an ETN does not pay a stated rate of interest but rather provides a return based on the performance of a reference index or benchmark (less any investor fees). ETNs may be linked to a broad-based securities index or to an index tied to emerging markets, commodities, a specific industry sector or other assets. ETNs are subject to issuer credit risks, market risks from the performance of their index or benchmark, price volatility risk and liquidity risk, and may be subject to leverage risk.


Event-Driven Risk: Event-driven investments involve the risk that certain of the events driving the investment may not happen or the market may react differently than expected to the anticipated transaction. In addition, although an event may occur or is announced, it may be renegotiated, terminated or involve a longer time frame than originally contemplated. Event-driven investment transactions are also subject to the risk of overall market movements. Any one of these risks could cause the Fund to experience investment losses, impacting its shares negatively.


Foreign Securities Risks: The securities of foreign issuers may be less liquid and more volatile than securities of comparable U.S. issuers. The costs associated with securities transactions may be higher in foreign countries than in the United States. The U.S. dollar value of foreign securities traded in foreign currencies (and any dividends and interest earned) held by the Fund or by mutual funds in which the Fund invests may be affected favorably or unfavorably by changes in foreign currency exchange rates. An increase in the U.S. dollar relative to these other currencies may adversely affect the Fund. Additionally, investments in foreign securities, even those publicly traded in the United States, may involve risks which are in addition to those inherent in U.S. investments. Foreign companies may not be subject to the same regulatory requirements of U.S. companies, and as a consequence, there may be less publicly available information about such companies. Also, foreign companies may not be subject to uniform accounting, auditing, and financial reporting standards and requirements comparable to those applicable to U.S. companies. Foreign governments and foreign economies often are less stable than the U.S. Government and the U.S. economy.


Hedging Transaction Risk: The success of the Fund's hedging strategies will be subject to the Adviser's ability to assess correctly the degree of correlation between the performance of the instruments used in the hedging strategies and the performance of the investments in the Fund's portfolio being hedged. Hedging transactions involve the risk of imperfect correlation. Imperfect correlation may prevent the Fund from achieving the intended hedge or expose the Fund to risk of loss. Hedging transactions also limit the opportunity for gain if the value of a hedged portfolio position should increase.


High Portfolio Turnover Risks: The Fund's investment strategies may result in higher portfolio turnover rates. This may increase the Fund's brokerage commission costs, which would reduce performance. Rapid portfolio turnover also exposes shareholders to a higher current realization of short-term gains which could cause you to pay higher taxes.


Interest Rate Risks: Prices of debt securities and preferred stocks tend to move inversely with changes in interest rates. When interest rates fall, the market value of the respective debt securities and preferred securities usually increases. Conversely, when interest rates rise, the market value of the respective debt securities and preferred securities usually declines. As such, a change in interest rates may affect prices of the Fund's debt securities and preferred securities and, accordingly, the Fund's share price.


Large Shareholder Transaction Risk: The Fund may experience adverse effects when certain large shareholders purchase or redeem large amounts of shares of the Fund. Such large shareholder redemptions may cause the Fund to sell its securities at times when it would not otherwise do so, which may negatively impact the Fund's NAV and liquidity. In addition, a large redemption could result in the Fund's current expenses being allocated over a smaller asset base, leading to an increase in the Fund's expense ratio. Similarly, large share purchases may adversely affect the Fund's performance to the extent that the Fund is delayed in investing new cash and is required to maintain a larger cash position than it ordinarily would.


Leverage Risks: If the Fund uses leverage through activities such as borrowing, entering into short sales, purchasing securities on margin or on a "when-issued" basis or purchasing derivative instruments in an effort to increase its returns, the Fund has the risk of magnified capital losses that occur when losses affect an asset base, enlarged by borrowings or the creation of liabilities, that exceeds the net assets of the Fund. Should the Fund employ leverage, the Fund's net asset value may be more volatile and sensitive to market movements. Leverage may involve the creation of a liability that requires the Fund to pay interest.


Market Risks: Market risk is the possibility that securities prices will fluctuate over time. This fluctuation includes both increases and decreases in security prices. The Fund is subject to market risk. The value of the Fund's investments, and the net asset value of the Fund, will fluctuate. Investors could lose money due to this price fluctuation.


Non-Diversification Risks: The Fund is a non-diversified investment company, which means that more of the Fund's assets may be invested in the securities of a single issuer than could be invested in the securities of a single issuer by a diversified investment company. This may make the value of the Fund's shares more susceptible to certain risks than shares of a diversified investment company. As a non-diversified fund, the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.


Options Risks: Options transactions involve special risks that may make it difficult or impossible to close a position when the Fund desires. These risks include possible imperfect correlation between the price movements of the option and the underlying security; the potential lack of a liquid secondary market at any particular time; and possible price fluctuation limits. In addition, the option activities of the Fund may affect its portfolio turnover rate and the amount of brokerage commissions paid by the Fund.


Short Sale Risks: The Fund will suffer a loss if it sells a security short and the value of the security rises rather than falls. It is possible that the Fund's long positions will decline in value at the same time that the value of its short positions increase, thereby increasing potential losses to the Fund. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as "covering" the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. The Fund's investment performance will also suffer if it is required to close out a short position earlier than it had intended. In addition, the Fund may be subject to expenses related to short sales that are not typically associated with investing in securities directly, such as costs of borrowing. These expenses may negatively impact the performance of the Fund. Short positions may introduce additional risk to the Fund because a short position loses value as a security's price increases and there is no theoretical ceiling to the price of the shorted security. Therefore, securities sold short have unlimited risk.


Small and Medium Capitalization Securities Risks: Securities issued by small and medium capitalization companies tend to be less liquid and more volatile than stocks of companies with relatively large market capitalizations. Securities of small and medium capitalization companies may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, these small and medium sized companies may have limited product lines, markets and financial resources, and may depend upon a relatively small management group. Therefore, small and medium capitalization stock prices may be more volatile than those of larger companies.


Total Return Swap Risks: In a standard "swap" transaction, two parties agree to exchange the returns (or differentials in rates of return) earned or realized on particular predetermined investments or instruments. Certain categories of swap agreements often have terms of greater than seven days and may be considered illiquid. Moreover, the Fund bears the risk of loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a swap agreement counterparty. The swaps market is subject to extensive regulation under the Dodd-Frank Act and certain Securities and Exchange Commission and Commodity Futures Trading Commission rules promulgated thereunder. It is possible that developments in the swaps market, including new and additional government regulation, could result in higher Fund costs and expenses and could adversely affect the Fund's ability, among other things, to terminate existing swap agreements or to realize amounts to be received under such agreements.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, investing in the Fund entails risks that could cause the Fund and you to lose money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is a non-diversified investment company, which means that more of the Fund's assets may be invested in the securities of a single issuer than could be invested in the securities of a single issuer by a diversified investment company. This may make the value of the Fund's shares more susceptible to certain risks than shares of a diversified investment company. As a non-diversified fund, the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information provides some indication of the risks and variability of investing in the Fund by showing how the Fund's performance has varied over time. The performance shown reflects the performance of the Fund's Class R shares before and after taxes and the Fund's Class I, Class C and Class A shares before taxes.


The bar chart and performance table shown below depict the performance of the Fund's Class R shares for the period indicated and show how the Fund's average annual total returns compare with those of a broad measure of market performance. The performance table includes the performance of the Fund's Class I, Class C and Class A shares before taxes. How the Fund has performed in the past (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Performance reflects fee waivers in effect. If fee waivers were not in place, the Fund's performance would be reduced. Updated information on the Fund's performance can be obtained by visiting www.arbitragefunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks and variability of investing in the Fund by showing how the Fund's performance has varied over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.arbitragefunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture How the Fund has performed in the past (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Annual Total Returns through December 31, 2017 – Class R Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the period shown in the bar chart, the highest return for a quarter was 2.91% during the quarter ended September 30, 2016 and the lowest return for a quarter was -6.05% during the quarter ended September 30, 2015.


The year-to-date return of the Fund's Class R shares through June 30, 2018 is 0.49%.


While the Class I shares, Class C shares and Class A shares would have substantially similar annual returns to the Class R shares because the shares are invested in the same portfolio of securities, the performance of Class I, Class C, and Class A shares will differ from that shown above since the Classes do not have the same expenses.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.49%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.05%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for Periods Ended December 31, 2017
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective August 30, 2018, the Fund's primary benchmark changed from the Standard & Poor's 500® Index to the ICE BofA Merrill Lynch U.S. 3-Month Treasury Bill Index. The Adviser believes that, given the Fund's investment objective and strategy, the ICE BofA Merrill Lynch U.S. 3-Month Treasury Bill Index provides a more appropriate basis for comparison. The Standard & Poor's 500® Index is the Fund's secondary benchmark.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
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 taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class R shares only, and after-tax returns for Class I, Class C, and Class A shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Fund's return after taxes on distributions and sale of Fund shares may be higher than its returns before taxes or its returns after taxes on distributions because it may include a tax benefit resulting from the capital losses that would have been incurred.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The table below shows the Fund's average annual total returns for Class R shares, Class I shares, Class C shares and Class A shares compared with those of the ICE BofA Merrill Lynch U.S. 3-Month Treasury Bill Index, which is comprised of a single issue purchased at the beginning of the month, held for a full month and rolled into a newly selected issue at month-end. The issue selected at each month-end rebalancing is the outstanding Treasury Bill that matures closest to, but not beyond, three months from the rebalancing date. The table also shows performance for Standard & Poor's 500® Index, a broad-based measure of equity market performance. The table also presents the impact of taxes on the returns of the Fund's Class R shares. After-tax returns are shown for Class R shares only, and after-tax returns for Class I, Class C, and Class A shares will vary. 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 taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. Return after taxes on distributions measures the effect of taxable distributions, but assumes the underlying shares are held for the entire period. Return after taxes on distributions and sale of Fund shares shows the effect of both taxable distributions and any taxable gain or loss that would be realized if the underlying shares were purchased at the beginning and sold at the end of the period (for purposes of the calculation, it is assumed that income dividends and capital gain distributions are reinvested at net asset value and that the entire account is redeemed at the end of the period, including reinvested amounts). The Fund's return after taxes on distributions and sale of Fund shares may be higher than its returns before taxes or its returns after taxes on distributions because it may include a tax benefit resulting from the capital losses that would have been incurred.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns
Arbitrage Tactical Equity Fund | ICE BOFA MERRILL LYNCH U.S. 3-MONTH TREASURY BILL INDEX (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.85% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.41% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2014
Arbitrage Tactical Equity Fund | STANDARD & POOR'S 500® INDEX (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.83%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 11.02% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2014
Arbitrage Tactical Equity Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Dividend on Short Positions and Interest Expense on Short Positions and/or Borrowings rr_Component2OtherExpensesOverAssets 0.66%
All Remaining Other Expenses rr_Component3OtherExpensesOverAssets 10.36%
Other Expenses rr_OtherExpensesOverAssets 11.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 12.59%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (10.17%) [4]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 2.42% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 245
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,636
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,677
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,570
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 245
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,636
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,677
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,570
Annual Return 2015 rr_AnnualReturn2015 (7.42%)
Annual Return 2016 rr_AnnualReturn2016 4.58%
Annual Return 2017 rr_AnnualReturn2017 5.84%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.84%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.82% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2014
Arbitrage Tactical Equity Fund | Class R | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.84%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.68% [2]
Arbitrage Tactical Equity Fund | Class R | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.31%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.56% [2]
Arbitrage Tactical Equity Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Dividend on Short Positions and Interest Expense on Short Positions and/or Borrowings rr_Component2OtherExpensesOverAssets 0.66%
All Remaining Other Expenses rr_Component3OtherExpensesOverAssets 10.36%
Other Expenses rr_OtherExpensesOverAssets 11.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 12.34%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (10.17%) [4]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 2.17% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 220
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,575
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,597
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,488
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 220
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,575
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,597
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,488
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.84%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.82% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2014
Arbitrage Tactical Equity Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [6]
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Dividend on Short Positions and Interest Expense on Short Positions and/or Borrowings rr_Component2OtherExpensesOverAssets 0.66%
All Remaining Other Expenses rr_Component3OtherExpensesOverAssets 10.36%
Other Expenses rr_OtherExpensesOverAssets 11.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 13.34%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (10.17%) [4]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 3.17% [5]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock This contingent deferred sales charge applies to Class C shares redeemed within 12 months of purchase.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 420
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,815
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,911
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,800
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 320
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,815
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,911
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,800
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.84%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.82% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2014
Arbitrage Tactical Equity Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.25%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [7]
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Dividend on Short Positions and Interest Expense on Short Positions and/or Borrowings rr_Component2OtherExpensesOverAssets 0.66%
All Remaining Other Expenses rr_Component3OtherExpensesOverAssets 10.36%
Other Expenses rr_OtherExpensesOverAssets 11.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 12.59%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (10.17%) [4]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 2.42% [5]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A deferred sales charge of up to 1.00% may be imposed on purchases of $500,000 or more of Class A shares purchased without a front-end sales charge that are redeemed within 18 months of purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A Shares if you and your family invest, or agree to invest in the future, at least $100,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 562
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,875
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,850
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,617
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 562
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,875
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,850
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,617
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.42%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.30%) [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2014
[1] Effective August 30, 2018, the Fund's primary benchmark changed from the Standard & Poor's 500® Index to the ICE BofA Merrill Lynch U.S. 3-Month Treasury Bill Index. The Adviser believes that, given the Fund's investment objective and strategy, the ICE BofA Merrill Lynch U.S. 3-Month Treasury Bill Index provides a more appropriate basis for comparison. The Standard & Poor's 500® Index is the Fund's secondary benchmark.
[2] The inception date for Class R shares, Class I shares, Class C shares, and Class A shares is December 31, 2014, The "Since Inception" returns reflected for the ICE BofA Merrill Lynch U.S. 3-Month Treasury Bill Index and the Standard & Poor's 500 Index are based on the inception date for Class R, Class I, Class C, and Class A shares.
[3] Acquired Fund Fees and Expenses are expenses incurred indirectly by the Fund through its ownership of shares in other investment companies.
[4] The Fund has entered into an Expense Waiver and Reimbursement Agreement with the Fund's investment adviser pursuant to which the adviser has contractually agreed to limit the total annual operating expenses of the Fund, not including taxes, interest, dividends on short positions, brokerage commissions, acquired fund fees and expenses and other costs incurred in connection with the purchase or sale of portfolio securities, so that they do not exceed 1.69% of the Fund's average daily net assets allocable to the Class R shares, 1.44% of the Fund's average daily net assets allocable to the Class I shares, 2.44% of the Fund's average daily net assets allocable to the Class C shares, and 1.69% of the Fund's average daily net assets allocable to the Class A shares. The agreement remains in effect until September 30, 2019, and thereafter continues until either party terminates it upon not less than five days' notice by sending a written notice to the other party. The adviser may recoup any waived amount from the Fund pursuant to the agreement, if such recoupment does not cause the Fund to exceed existing expense limitations in effect at the time the amounts were waived and the recoupment is done within three years after the year in which the expense was waived.
[5] The Total Annual Fund Operating Expenses in this fee table do not correlate to the expense ratio in the Financial Highlights because the expense ratios in the Financial Highlights do not reflect Acquired Fund Fees and Expenses.
[6] This contingent deferred sales charge applies to Class C shares redeemed within 12 months of purchase.
[7] A deferred sales charge of up to 1.00% may be imposed on purchases of $500,000 or more of Class A shares purchased without a front-end sales charge that are redeemed within 18 months of purchase.