XML 24 R12.htm IDEA: XBRL DOCUMENT v3.20.1
Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2019
Entity Registrant Name dei_EntityRegistrantName Investment Managers Series Trust
Entity Central Index Key dei_EntityCentralIndexKey 0001318342
Amendment Flag dei_AmendmentFlag false
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Document Creation Date dei_DocumentCreationDate Feb. 28, 2020
Document Effective Date dei_DocumentEffectiveDate Mar. 01, 2020
Prospectus Date rr_ProspectusDate Mar. 01, 2020
EuroPac International Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION – EuroPac International Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the EuroPac International Value Fund (the "Fund") is to seek income and long term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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 if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional and in the section titled "Sales Charge Schedule" on page 56 of this prospectus and in "APPENDIX A – Waivers and Discounts Available from Intermediaries" of the Prospectus.
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 your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2021
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 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 the most recent fiscal year, the Fund's portfolio turnover rate was 15% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 15.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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. The example 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 operating expenses remain the same. The example reflects the Fund's contractual fee waiver and/or expense reimbursement only for the term of the contractual fee waiver and/or expense reimbursement. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in common stocks of companies located in Europe or the Pacific Rim. The Fund's advisor considers a country to be part of Europe if it is included in one of the MSCI European indexes and part of the Pacific Rim if any of its borders touches the Pacific Ocean. The advisor considers a company to be located in Europe or the Pacific Rim if (1) the company is organized under the laws of a country that is part of Europe or the Pacific Rim or has its principal office in a country that is part of Europe or the Pacific Rim; (2) at the time of investment, the company derived a significant portion (i.e., 50% or more) of its total revenues during its most recent completed fiscal year from business activities in Europe or the Pacific Rim; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets in Europe or the Pacific Rim. The Fund will invest primarily in non-U.S. companies. The advisor considers a company to be a non-U.S. company if (1) the company is organized under the laws of a country, or has its principal office in a country, other than the United States; (2) at the time of investment, the company derived at least 50% of its total revenues during its most recent completed fiscal year from business activities outside of the United States; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets outside of the United States. The Fund may invest in companies in developed and emerging markets. The Fund may also invest in securities of companies engaged in the gold industry. Investments related to gold are considered speculative and are affected by a variety of worldwide economic, financial and political factors.

 

The Fund will invest in large-, mid-, and small-capitalization companies that are considered by the Fund's advisor to be value oriented and dividend paying companies. The Fund's advisor uses a value investing style focusing on the companies it believes are undervalued. Subject to the Fund's fundamental policy prohibiting the concentration of 25% or more of the Fund's total assets in investments in any one industry or group of related industries, the Fund's advisor may focus the Fund's investments in one or more sectors. The Fund's investments in equity securities may also include preferred stock, convertible securities, warrants and options on equities and stock indices, and exchange-traded funds ("ETFs"). The Fund may also invest in American and Global Depository Receipts ("ADRs" and "GDRs"), including unsponsored ADRs.

 

The Fund seeks to identify countries, and industries within those countries that are best positioned to perform relative to other countries and industries. In making this determination a number of considerations are taken into account such as expectations for change in valuation of foreign currency, changes in world demand for products or services, diversification of foreign trade practices, policy changes of the foreign government, and expectations for fundamental factors such as interest rates, inflation and GDP growth. Following selection of countries and industries, the Fund's advisor will use a bottom-up approach to select individual companies. The advisor considers a number of qualitative and quantitative factors when selecting the companies such as dividend yield, valuation versus growth, capital structure, quality of management, corporate governance practices, liquidity, strengths and opportunities compared to the peer group, and business specific risk. The Fund's advisor also seeks to identify companies with minimal revenue exposure to the U.S. markets.
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Risk is inherent in all investing. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objective.

 

Management and Strategy Risk. The value of your investment depends on the judgment of the Fund's advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect.

 

Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

 

Equity Risk. The value of the equity securities held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or factors relating to specific companies in which the Fund invests.

 

Foreign Investment Risk. The prices of foreign securities may be more volatile than the prices of securities of U.S. issuers because of economic and social conditions abroad, political developments, and changes in the regulatory environments of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the values of the Fund's foreign investments. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms. Foreign securities include American Depository Receipts ("ADRs") and Global Depository Receipts ("GDRs"). Unsponsored ADRs and GDRs are organized independently and without the cooperation of the foreign issuer of the underlying securities, and involve additional risks because U.S. reporting requirements do not apply. In addition, the issuing bank may deduct shareholder distribution, custody, foreign currency exchange, and other fees from the payment of dividends.

 

Geographic Concentration Risk. A fund that is less diversified across countries or geographic regions is generally riskier than a more geographically diversified fund. Investments in a single region, even though representing a number of different countries within the region, may be affected by common economic forces and other factors. This vulnerability to factors affecting the value of investments is significantly greater for a fund that concentrates its investment in a particular region or regions than a more geographically diversified fund, and may result in greater losses and volatility. The economies and financial markets of certain regions, such as Latin America, Asia or Eastern Europe, can be interdependent and may decline all at the same time.

 

Geographic Risk Related to Europe. The Fund will be more susceptible to the economic, market, political and local risks of the European region than a fund that is more geographically diversified. Europe includes both developed and emerging markets. Most Western European countries are members of the European Union, which imposes restrictions on inflation rates, deficits and debt levels. Both developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the European Monetary Union. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries including those of Eastern Europe. The markets in Eastern Europe remain relatively undeveloped and can be particularly sensitive to political and economic developments. The European financial markets have recently experienced volatility and adverse trends due to concerns about rising government debt levels of certain European countries, each of which may require external assistance to meet its obligations and run the risk of default on its debt, possible bail-out by the rest of the European Union or debt restructuring. Assistance given to a European Union member state may be dependent on a country's implementation of reforms in order to curb the risk of default on its debt, and a failure to implement these reforms or increase revenues could result in a deep economic downturn. These events have adversely affected the exchange rate of the euro and therefore may adversely affect the Fund and its investments. On January 31, 2020, the United Kingdom formally withdrew from the EU, which withdrawal is commonly referred to as "Brexit." The Fund faces risks associated with the uncertainty and consequences following Brexit. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions, and could contribute to instability in global political institutions, regulatory agencies and financial markets. Any effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund invests.

 

Geographic Risk Related to Pacific Rim. The Fund will be more susceptible to the economic, market, regulatory, political, natural disasters and local risks of the Pacific Rim region than a fund that is more geographically diversified. The Pacific Rim region includes countries in all stages of economic development; however, it has a higher prevalence of emerging market countries as compared to other regions of the world. The region has historically been highly dependent on global trade, with nations taking strong roles in both the importing and exporting of goods; such a relationship creates a risk with this dependency on global growth. The respective stock markets tend to have a larger prevalence of smaller capitalization companies. Varying levels of accounting and disclosure standards, restrictions on foreign ownership, minority ownership rights, and corporate governance standards are also common for the region.

 

Sector Risk. From time to time, the Fund may invest a significant amount of its total assets in each of certain sectors of the economy. Each of those sectors may be subject to specific risks. These risks include governmental regulation of the sector and governmental monetary and fiscal policies, which may impact interest rates and currencies and affect corporate funding and international trade. Certain sectors may be more vulnerable than others to these factors. In addition, market sentiment and expectations toward a particular sector could affect a company's market valuation and access to equity funding. For example, as of October 31, 2019, 31.4% of the Fund's assets were invested in the basic materials sector and 30.0% of the Fund's assets were invested in the consumer non-cyclical sector. Performance of companies in the materials industry can be significantly affected by the level and volatility of commodity prices, the exchange value of the dollar, import and export controls, increased competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control. Performance of companies in the consumer non-cyclical sector may be adversely impacted by fluctuations in supply and demand, changes in the global economy, consumer spending, competition, demographics and consumer preferences, and production spending. Companies in the consumer non-cyclical sector are also affected by changes in government regulation, global economic, environmental and political events, and economic conditions.

 

Value-Oriented Investment Strategies Risk. Value stocks are those that are believed to be undervalued in comparison to their peers due to adverse business developments or other factors. Value investing is subject to the risk that the market will not recognize a security's inherent value for a long time or at all, or that a stock judged to be undervalued may actually be appropriately priced or overvalued. In addition, during some periods (which may be extensive) value stocks generally may be out of favor in the markets.

 

Gold Industry Risk. Investments related to gold are considered speculative and are affected by a variety of worldwide economic, financial and political factors. The price of gold may fluctuate sharply over short periods of time, even during periods of rising prices, due to changes in inflation or expectations regarding inflation in various countries, the availability of supplies, changes in industrial and commercial demand, limited markets, fabricator demand, gold sales by governments, trade imbalances and restrictions, currency devaluation or revaluation, central banks or international agencies, investment speculation, inability to raise capital, increases in production costs, political unrest in nations where sources of gold are located, monetary and other economic policies of various governments and government restrictions on private ownership of gold and mining land.

 

Currency Risk. The values of investments in securities denominated in foreign currencies increase or decrease as the rates of exchange between those currencies and the U.S. Dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile and are affected by factors such as general economic conditions, the actions of the United States and foreign governments or central banks, the imposition of currency controls, and speculation.

 

Emerging Market Risk. Many of the risks with respect to foreign investments are more pronounced for investments in issuers in developing or emerging market countries. Emerging market countries tend to have more government exchange controls, more volatile interest and currency exchange rates, less market regulation, and less developed economic, political and legal systems than those of more developed countries. In addition, emerging market countries may experience high levels of inflation and may have less liquid securities markets and less efficient trading and settlement systems.

 

Convertible Securities Risk. Convertible securities are subject to market and interest rate risk and credit risk. When the market price of the equity security underlying a convertible security decreases the convertible security tends to trade on the basis of its yield and other fixed income characteristics, and is more susceptible to credit and interest rate risks. When the market price of such equity security rises, the convertible security tends to trade on the basis of its equity conversion features and be more exposed to market risk. Convertible securities are typically issued by smaller capitalized companies with stock prices that may be more volatile than those of other companies.

 

Cybersecurity Risk. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data (including private shareholder information), or proprietary information, or cause the Fund, the Advisor, and/or other service providers (including custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. In an extreme case, a shareholder's ability to exchange or redeem Fund shares may be affected.

 

ETF Risk. Investing in an ETF will provide the Fund with exposure to the securities comprising the index on which the ETF is based and will expose the Fund to risks similar to those of investing directly in those securities. Shares of ETFs typically trade on securities exchanges and may at times trade at a premium or discount to their net asset values. In addition, an ETF may not replicate exactly the performance of the benchmark index it seeks to track for a number of reasons, including transaction costs incurred by the ETF, the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of securities held. Investing in ETFs, which are investment companies, involves duplication of advisory fees and certain other expenses. The Fund will pay brokerage commissions in connection with the purchase and sale of shares of ETFs.

 

Liquidity Risk. The Fund may not be able to sell some or all of the investments that it holds due to a lack of demand in the marketplace or other factors such as market turmoil, or if the Fund is forced to sell an illiquid asset to meet redemption requests or other cash needs it may only be able to sell those investments at a loss. Illiquid assets may also be difficult to value.

 

Market Capitalization Risk. Larger, more established companies may be unable to attain the high growth rates of successful, smaller companies during periods of economic expansion. The securities of small-capitalization and mid-capitalization companies may be subject to more abrupt or erratic market movements and may have lower trading volumes or more erratic trading than securities of larger, more established companies or market averages in general. In addition, such companies typically are more likely to be adversely affected than large capitalization companies by changes in earning results, business prospects, investor expectations or poor economic or market conditions.

 

Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities. If the Fund is not able to sell an option held in its portfolio, it would have to exercise the option to realize any profit and would incur transaction costs upon the purchase or sale of the underlying securities. Ownership of options involves the payment of premiums, which may adversely affect the Fund's performance. To the extent that the Fund invests in over-the-counter options, the Fund may be exposed to counterparty risk.

 

Preferred Stock Risk. Preferred stock represents an equity interest in a company that generally entitles the holder to receive, in preference to the holders of other stocks such as common stock, dividends and a fixed share of the proceeds resulting from a liquidation of the company. The market value of preferred stock is subject to company-specific and market risks applicable generally to equity securities and is also sensitive to changes in the company's creditworthiness, the ability of the company to make payments on the preferred stock, and changes in interest rates, typically declining in value if interest rates rise.

 

Warrants Risk. Warrants may lack a liquid secondary market for resale. The prices of warrants may fluctuate as a result of speculation or other factors. Warrants can provide a greater potential for profit or loss than an equivalent investment in the underlying security. Prices of warrants do not necessarily move in tandem with the prices of their underlying securities and are highly volatile and speculative investments. If a warrant expires without being exercised, the Fund will lose any amount paid for the warrant.
Risk Lose Money [Text] rr_RiskLoseMoney Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of shares of the Fund compare with the average annual total returns of a broad-based market index. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. Updated performance information is available at the Fund's website, www.europacificfunds.com, or by calling the Fund at 1-888-558-5851. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Sales loads are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of shares of the Fund compare with the average annual total returns of a broad-based market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-558-5851
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.europacificfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return (before taxes) for Class A Shares For each calendar year at NAV
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales loads are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Class A Shares    
Highest Calendar Quarter Return at NAV 17.58% Quarter Ended 03/31/2016
Lowest Calendar Quarter Return at NAV (22.00)% Quarter Ended 09/30/2015
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended December 31, 2019)
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 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 A Shares only and after-tax returns for classes other than Class A will vary from returns shown for Class A.
EuroPac International Value Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPIVX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 1.08%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.45%
Other expenses rr_OtherExpensesOverAssets 0.54%
Total annual fund operating expenses rr_ExpensesOverAssets 1.87%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.12%) [1]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.75% [1]
One Year rr_ExpenseExampleYear01 $ 620
Three Years rr_ExpenseExampleYear03 1,000
Five Years rr_ExpenseExampleYear05 1,405
Ten Years rr_ExpenseExampleYear10 $ 2,532
Annual Return 2011 rr_AnnualReturn2011 (12.84%)
Annual Return 2012 rr_AnnualReturn2012 13.59%
Annual Return 2013 rr_AnnualReturn2013 (1.76%)
Annual Return 2014 rr_AnnualReturn2014 (10.67%)
Annual Return 2015 rr_AnnualReturn2015 (26.31%)
Annual Return 2016 rr_AnnualReturn2016 17.99%
Annual Return 2017 rr_AnnualReturn2017 15.09%
Annual Return 2018 rr_AnnualReturn2018 (14.49%)
Annual Return 2019 rr_AnnualReturn2019 16.72%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Calendar Quarter Return at NAV
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Calendar Quarter Return at NAV
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.00%)
1 Year rr_AverageAnnualReturnYear01 11.50%
5 Years rr_AverageAnnualReturnYear05 (0.95%)
Since Inception rr_AverageAnnualReturnSinceInception (0.96%)
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 07, 2010
EuroPac International Value Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPVIX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 1.08%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.45%
Other expenses rr_OtherExpensesOverAssets 0.54%
Total annual fund operating expenses rr_ExpensesOverAssets 1.62%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.12%) [1]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.50% [1]
One Year rr_ExpenseExampleYear01 $ 153
Three Years rr_ExpenseExampleYear03 499
Five Years rr_ExpenseExampleYear05 870
Ten Years rr_ExpenseExampleYear10 $ 1,912
1 Year rr_AverageAnnualReturnYear01 16.98% [2]
5 Years rr_AverageAnnualReturnYear05 0.22% [2]
Since Inception rr_AverageAnnualReturnSinceInception (0.25%) [2]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 16, 2013 [2]
EuroPac International Value Fund | After Taxes on Distributions | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 11.37% [3]
5 Years rr_AverageAnnualReturnYear05 (1.06%) [3]
Since Inception rr_AverageAnnualReturnSinceInception (1.27%) [3]
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 07, 2010 [3]
EuroPac International Value Fund | After Taxes on Distributions and Sales | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 7.33% [3]
5 Years rr_AverageAnnualReturnYear05 (0.53%) [3]
Since Inception rr_AverageAnnualReturnSinceInception (0.51%) [3]
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 07, 2010 [3]
EuroPac International Value Fund | MSCI All Country World Ex USA Value Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 15.71%
5 Years rr_AverageAnnualReturnYear05 3.65%
Since Inception rr_AverageAnnualReturnSinceInception 3.45%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 07, 2010
EuroPac International Value Fund | MSCI World Ex USA Value Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 17.02%
5 Years rr_AverageAnnualReturnYear05 3.59%
Since Inception rr_AverageAnnualReturnSinceInception 3.96%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 07, 2010
EuroPac International Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION – EuroPac International Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the EuroPac International Bond Fund (the "Fund") is to seek current income and capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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 if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional and in the section titled "Sales Charge Schedule" on page 56 of this prospectus and in "APPENDIX A – Waivers and Discounts Available from Intermediaries" of the Prospectus.
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 your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2021
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 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 the most recent fiscal year, the Fund's portfolio turnover rate was 26% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 26.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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. The example 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 operating expenses remain the same. The example reflects the Fund's contractual fee waiver and/or expense reimbursement only for the term of the contractual fee waiver and/or expense reimbursement. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in bonds issued by companies located in Europe or the Pacific Rim. The Fund's advisor considers a country to be part of Europe if it is included in one of the MSCI European indexes and part of the Pacific Rim if any of its borders touches the Pacific Ocean. The advisor considers a company to be located in Europe or the Pacific Rim if (1) the company is organized under the laws of a country that is a part of Europe or the Pacific Rim or has its principal office in a country that is a part of Europe or the Pacific Rim; (2) at the time of investment, the company derived a significant portion (i.e., 50% or more) of its total revenues during its most recent completed fiscal year from business activities in Europe or the Pacific Rim; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets in Europe or the Pacific Rim. The Fund will invest primarily in bonds issued by non-U.S. companies. The advisor considers a company to be a non-U.S. company if (1) the company is organized under the laws of a country, or has its principal office in a country, other than the United States; (2) at the time of investment, the company derived at least 50% of its total revenues during its most recent completed fiscal year from business activities outside of the United States; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets outside of the United States.

 

Fixed income securities in which the Fund may invest include developed and emerging market debt obligations of governments, their agencies and instrumentalities, asset-backed securities, investment grade and below investment grade (commonly known as "junk bonds") corporate debt obligations, and convertible bonds. Corporate debt obligations include corporate bonds, debentures, notes and other similar instruments. Although the Fund may invest in fixed income securities rated in any category, it will primarily invest in investment grade securities. Investment grade fixed income securities include securities rated BBB- or higher by Standard & Poor's Corporation ("S&P") or Baa3 or higher by Moody's Investors Service, Inc. ("Moody's") or, if unrated by S&P and Moody's, determined by the Fund's advisor to be of comparable credit quality. The Fund may invest in securities, including sovereign debt securities, denominated in U.S. dollars or in foreign currencies.

 

The securities in which the Fund invests may pay interest at fixed rates, variable rates, or subject to reset terms. In addition, these securities may make principal payments that are fixed, variable or both. There is no limit on the maturity of any security held by the Fund. Although the Fund's advisor expects to maintain an intermediate- to long-term weighted average maturity for the Fund, there are no maturity restrictions on the overall portfolio or on individual securities. The Fund may invest in large-, mid-, and small-capitalization companies issuing fixed income securities. In addition, the Fund may use derivatives, such as forward contracts and currency and interest rate swaps, as a hedge (to offset risks associated with an investment, currency exposure, or market conditions) and to earn income and enhance returns.

 

The Fund's advisor first selects foreign currency compositions based on an evaluation of various macroeconomic factors including, but not limited to, relative interest rates, exchange rates, monetary and fiscal policies, and trade and current account balances. Once the advisor establishes currency compositions, it then selects fixed income securities that it believes offer attractive income and/or capital appreciation potential with a reasonable level of risk. The Fund generally invests where relative combinations of fixed income returns and currency exchange rates appear attractive. The Fund's advisor may sell securities for a variety of reasons, but in most cases in order to adjust the portfolio's average maturity, credit quality or yield, or to change geographic or currency exposures.
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Risk is inherent in all investing. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objective.

 

Management and Strategy Risk. The value of your investment depends on the judgment of the 'Fund's advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect.

 

Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

 

Fixed Income Securities (Bond) Risk. The prices of fixed income securities respond to economic developments, particularly interest rate changes, as well as to changes in an issuer's credit rating or market perceptions about the creditworthiness of an issuer. Generally fixed income securities decrease in value if interest rates rise and increase in value if interest rates fall, and longer-term and lower rated securities are more volatile than shorter-term and higher rated securities.

 

Foreign Investment Risk. The prices of foreign securities may be more volatile than the prices of securities of U.S. issuers because of economic and social conditions abroad, political developments, and changes in the regulatory environments of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the values of the Fund's foreign investments. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms.

 

Geographic Concentration Risk. A fund that is less diversified across countries or geographic regions is generally riskier than a more geographically diversified fund. Investments in a single region, even though representing a number of different countries within the region, may be affected by common economic forces and other factors. This vulnerability to factors affecting the value of investments is significantly greater for a fund that concentrates its investment in a particular region or regions than a more geographically diversified fund, and may result in greater losses and volatility. The economies and financial markets of certain regions, such as Latin America, Asia or Eastern Europe, can be interdependent and may decline all at the same time.

 

Geographic Risk Related to Europe. The Fund will be more susceptible to the economic, market, political and local risks of the European region than a fund that is more geographically diversified. Europe includes both developed and emerging markets. Most Western European countries are members of the European Union, which imposes restrictions on inflation rates, deficits and debt levels. Both developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the European Monetary Union. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries including those of Eastern Europe. The markets in Eastern Europe remain relatively undeveloped and can be particularly sensitive to political and economic developments. The European financial markets have recently experienced volatility and adverse trends due to concerns about rising government debt levels of certain European countries, each of which may require external assistance to meet its obligations and run the risk of default on its debt, possible bail-out by the rest of the European Union or debt restructuring. Assistance given to a European Union member state may be dependent on a country's implementation of reforms in order to curb the risk of default on its debt, and a failure to implement these reforms or increase revenues could result in a deep economic downturn. These events have adversely affected the exchange rate of the euro and therefore may adversely affect the Fund and its investments. On January 31, 2020, the United Kingdom formally withdrew from the EU, which withdrawal is commonly referred to as "Brexit." The Fund faces risks associated with the uncertainty and consequences following Brexit. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions, and could contribute to instability in global political institutions, regulatory agencies and financial markets. Any effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund invests.

 

Geographic Risk Related to Pacific Rim. The Fund will be more susceptible to the economic, market, regulatory, political, natural disasters and local risks of the Pacific Rim region than a fund that is more geographically diversified. The Pacific Rim region includes countries in all stages of economic development; however, it has a higher prevalence of emerging market countries as compared to other regions of the world. The region has historically been highly dependent on global trade, with nations taking strong roles in both the importing and exporting of goods; such a relationship creates a risk with this dependency on global growth. The respective stock markets tend to have a larger prevalence of smaller capitalization companies. Varying levels of accounting and disclosure standards, restrictions on foreign ownership, minority ownership rights, and corporate governance standards are also common for the region.

 

Credit Risk. If an issuer or guarantor of a debt security held by the Fund or a counterparty to a financial contract with the Fund defaults or is downgraded or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of the Fund's portfolio will typically decline. Junk bonds have a higher risk of default than other fixed income securities and are considered predominantly speculative.

 

Foreign Sovereign Risk. Foreign governments rely on taxes and other revenue sources to pay interest and principal on their debt obligations. The payment of principal and interest on these obligations may be adversely affected by a variety of factors, including economic results within the foreign country, changes in interest and exchange rates, changes in debt ratings, changing political sentiments, legislation, policy changes, a limited tax base or limited revenue sources, natural disasters, or other economic or credit problems.

 

Currency Risk. The values of investments in securities denominated in foreign currencies increase or decrease as the rates of exchange between those currencies and the U.S. Dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile and are affected by factors such as general economic conditions, the actions of the United States and foreign governments or central banks, the imposition of currency controls, and speculation.

 

Asset-Backed Securities Risk. Asset-backed securities may be sensitive to changes in interest rates and subject to early repayment risk, and their value may fluctuate in response to the market's perception of issuer creditworthiness. While such securities are generally supported by some form of government or private guarantee there is no assurance that private guarantors will meet their obligations.

 

Emerging Market Risk. Many of the risks with respect to foreign investments are more pronounced for investments in issuers in developing or emerging market countries. Emerging market countries tend to have more government exchange controls, more volatile interest and currency exchange rates, less market regulation, and less developed economic, political and legal systems than those of more developed countries. In addition, emerging market countries may experience high levels of inflation and may have less liquid securities markets and less efficient trading and settlement systems.

 

Interest Rate Risk. Generally fixed income securities decrease in value if interest rates rise and increase in value if interest rates fall, with longer-term securities being more sensitive than shorter-term securities. For example, the price of a security with a three-year duration would be expected to drop by approximately 3% in response to a 1% increase in interest rates. Generally, the longer the maturity and duration of a bond or fixed rate loan, the more sensitive it is to this risk. Falling interest rates also create the potential for a decline in the Fund's income. Changes in governmental policy, rising inflation rates, and general economic developments, among other factors, could cause interest rates to increase and could have a substantial and immediate effect on the values of the Fund's investments. In addition, a potential rise in interest rates may result in periods of volatility and increased redemptions that might require the Fund to liquidate portfolio securities at disadvantageous prices and times.

 

High Yield ("Junk") Bond Risk. High yield bonds are debt securities rated below investment grade (often called "junk bonds"). Junk bonds are speculative, involve greater risks of default, downgrade, or price declines and are more volatile and tend to be less liquid than investment-grade securities. Companies issuing high yield bonds are less financially strong, are more likely to encounter financial difficulties, and are more vulnerable to adverse market events and negative sentiments than companies with higher credit ratings.

 

Liquidity Risk. The Fund may not be able to sell some or all of the investments that it holds due to a lack of demand in the marketplace or other factors such as market turmoil, or if the Fund is forced to sell an illiquid asset to meet redemption requests or other cash needs it may only be able to sell those investments at a loss. In addition, the reduction in dealer market-making capacity in the fixed income markets that has occurred in recent years has the potential to decrease the liquidity of the Fund's investments. Illiquid assets may also be difficult to value.

 

Cybersecurity Risk. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data (including private shareholder information), or proprietary information, or cause the Fund, the Advisor, and/or other service providers (including custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. In an extreme case, a shareholder's ability to exchange or redeem Fund shares may be affected.

 

Derivatives Risk. Derivatives include instruments and contracts that are based on and valued in relation to one or more underlying securities, financial benchmarks, indices, or other reference obligations or measures of value. Major types of derivatives include futures, options, swaps and forward contracts. Using derivatives can have a leveraging effect and increase fund volatility. Derivatives transactions can be highly illiquid and difficult to unwind or value, and changes in the value of a derivative held by the Fund may not correlate with the value of the underlying instrument or the Fund's other investments. Many of the risks applicable to trading the instruments underlying derivatives are also applicable to derivatives trading. However, additional risks are associated with derivatives trading that are possibly greater than the risks associated with investing directly in the underlying instruments. These additional risks include but are not limited to, illiquidity risk and counterparty credit risk. For derivatives that are required to be cleared by a regulated clearinghouse, other risks may arise from the Fund's relationship with a brokerage firm through which it submits derivatives trades for clearing, including in some cases from other clearing customers of the brokerage firm.
Risk Lose Money [Text] rr_RiskLoseMoney Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of the Fund compare with the average annual total returns of a broad-based market index. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. Updated performance information is available at the Fund's website, www.europacificfunds.com, or by calling the Fund at 1-888-558-5851. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Sales loads are not reflected in the bar chart, and if those changes were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of the Fund compare with the average annual total returns of a broad-based market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-558-5851
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.europacificfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return (before taxes) for Class A Shares For each calendar year at NAV
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales loads are not reflected in the bar chart, and if those changes were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Class A Shares    
Highest Calendar Quarter Return at NAV 5.58% Quarter Ended 03/31/2016
Lowest Calendar Quarter Return at NAV (7.36)% Quarter Ended 09/30/2015
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended December 31, 2019)
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 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 A Shares only and after-tax returns for classes other than Class A will vary from returns shown for Class A.
EuroPac International Bond Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPIBX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.57%
Other expenses rr_OtherExpensesOverAssets 0.66%
Total annual fund operating expenses rr_ExpensesOverAssets 1.51%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.36%) [4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.15% [4]
One Year rr_ExpenseExampleYear01 $ 562
Three Years rr_ExpenseExampleYear03 872
Five Years rr_ExpenseExampleYear05 1,204
Ten Years rr_ExpenseExampleYear10 $ 2,141
Annual Return 2011 rr_AnnualReturn2011 (0.43%)
Annual Return 2012 rr_AnnualReturn2012 7.99%
Annual Return 2013 rr_AnnualReturn2013 (4.45%)
Annual Return 2014 rr_AnnualReturn2014 (5.52%)
Annual Return 2015 rr_AnnualReturn2015 (12.51%)
Annual Return 2016 rr_AnnualReturn2016 1.56%
Annual Return 2017 rr_AnnualReturn2017 9.96%
Annual Return 2018 rr_AnnualReturn2018 (3.63%)
Annual Return 2019 rr_AnnualReturn2019 5.13%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Calendar Quarter Return at NAV
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Calendar Quarter Return at NAV
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.36%)
1 Year rr_AverageAnnualReturnYear01 0.35%
5 Years rr_AverageAnnualReturnYear05 (1.11%)
Since Inception rr_AverageAnnualReturnSinceInception (0.74%)
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2010
EuroPac International Bond Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPBIX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.57%
Other expenses rr_OtherExpensesOverAssets 0.66%
Total annual fund operating expenses rr_ExpensesOverAssets 1.26%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.36%) [4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 0.90% [4]
One Year rr_ExpenseExampleYear01 $ 92
Three Years rr_ExpenseExampleYear03 364
Five Years rr_ExpenseExampleYear05 657
Ten Years rr_ExpenseExampleYear10 $ 1,491
1 Year rr_AverageAnnualReturnYear01 5.45% [5]
5 Years rr_AverageAnnualReturnYear05 0.04% [5]
Since Inception rr_AverageAnnualReturnSinceInception none [5]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 16, 2013 [5]
EuroPac International Bond Fund | After Taxes on Distributions | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 0.35% [3]
5 Years rr_AverageAnnualReturnYear05 (1.37%) [3]
Since Inception rr_AverageAnnualReturnSinceInception (1.29%) [3]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2010 [3]
EuroPac International Bond Fund | After Taxes on Distributions and Sales | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 0.21% [3]
5 Years rr_AverageAnnualReturnYear05 (0.96%) [3]
Since Inception rr_AverageAnnualReturnSinceInception (0.76%) [3]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2010 [3]
EuroPac International Bond Fund | JPMorgan GBI Global ex-US FX NY Index Unhedged in USD (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 5.23%
5 Years rr_AverageAnnualReturnYear05 1.97%
Since Inception rr_AverageAnnualReturnSinceInception 0.90%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2010
EuroPac International Bond Fund | FTSE Non USD World Government Bond Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 5.32%
5 Years rr_AverageAnnualReturnYear05 1.87%
Since Inception rr_AverageAnnualReturnSinceInception 0.88%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2010
EuroPac International Dividend Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION – EuroPac International Dividend Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objectives of the EuroPac International Dividend Income Fund (the "Fund") are to seek income and maximize growth of income

Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

with capital appreciation as a secondary objective.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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 if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional and in the section titled "Sales Charge Schedule" on page 56 of this prospectus and in "APPENDIX A – Waivers and Discounts Available from Intermediaries" of the Prospectus.
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 February 28, 2021
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 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 the most recent fiscal year, the Fund's portfolio turnover rate was 15% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 15.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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. The example 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 operating expenses remain the same. The example reflects the Fund's contractual fee waiver and/or expense reimbursement only for the term of the contractual fee waiver and/or expense reimbursement. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of dividend paying companies located in Europe or the Pacific Rim. The Fund's advisor considers a country to be part of Europe if it is included in one of the MSCI European indexes and part of the Pacific Rim if any of its borders touches the Pacific Ocean. The advisor considers a company to be located in Europe or the Pacific Rim if (1) the company is organized under the laws of a country that is part of Europe or the Pacific Rim or has its principal office in a country that is part of Europe or the Pacific Rim; (2) at the time of investment, the company derived a significant portion (i.e., 50% or more) of its total revenues during its most recent completed fiscal year from business activities in Europe or the Pacific Rim; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets in Europe or the Pacific Rim. The Fund will invest primarily in non-U.S. companies. The advisor considers a company to be a non-U.S. company if (1) the company is organized under the laws of a country, or has its principal office in a country, other than the United States; (2) at the time of investment, the company derived at least 50% of its total revenues during its most recent completed fiscal year from business activities outside of the United States; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets outside of the United States. The Fund may invest in companies in developed and emerging markets. In addition, the Fund may invest in companies of all capitalizations but the advisor intends to invest a majority of the Fund's assets in common stocks of mid-cap and large-cap companies that the advisor considers to be value oriented and dividend paying companies. The Fund may also invest in preferred stock, convertible securities, warrants and options on equities, stock indices, and in securities of companies engaged in the gold industry. Investments related to gold are considered speculative and are affected by a variety of worldwide economic, financial and political factors. In addition, the Fund may invest in American and Global Depository Receipts ("ADRs" and "GDRs"), exchange-traded funds ("ETFs") and real estate investment trusts ("REITs").

 

The Fund employs a value-oriented approach to select securities the Fund's advisor believes are trading below their intrinsic value, and will pay sustainably high dividends that grow over time. In selecting securities, the Fund's advisor considers a number of qualitative and quantitative factors such as free cash flow and earnings yield and growth, operating leverage and balance sheet strength, as well as management quality and corporate governance. The Fund's advisor also employs a top down approach to its security selection process, with the objective of selecting companies with business exposure or assets in countries or sectors that it believes will benefit from a long-term, positive trend.
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Risk is inherent in all investing. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objectives.

 

Management and Strategy Risk. The value of your investment depends on the judgment of the Fund's advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect.

 

Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

 

Equity Risk. The value of the equity securities held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or factors relating to specific companies in which the Fund invests.

 

Foreign Investment Risk. The prices of foreign securities may be more volatile than the prices of securities of U.S. issuers because of economic and social conditions abroad, political developments, and changes in the regulatory environments of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the values of the Fund's foreign investments. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms. Foreign securities include American Depository Receipts ("ADRs") and Global Depository Receipts ("GDRs"). Unsponsored ADRs and GDRs are organized independently and without the cooperation of the foreign issuer of the underlying securities, and involve additional risks because U.S. reporting requirements do not apply. In addition, the issuing bank may deduct shareholder distribution, custody, foreign currency exchange, and other fees from the payment of dividends.

 

Geographic Concentration Risk. A fund that is less diversified across countries or geographic regions is generally riskier than a more geographically diversified fund. Investments in a single region, even though representing a number of different countries within the region, may be affected by common economic forces and other factors. This vulnerability to factors affecting the value of investments is significantly greater for a fund that concentrates its investment in a particular region or regions than a more geographically diversified fund, and may result in greater losses and volatility. The economies and financial markets of certain regions, such as Latin America, Asia or Eastern Europe, can be interdependent and may decline all at the same time.

 

Geographic Risk related to Europe. The Fund will be more susceptible to the economic, market, regulatory, political and local risks of the European region than a fund that is more geographically diversified. Europe includes both developed and emerging markets. Most Western European countries are members of the European Union, which imposes restrictions on inflation rates, deficits and debt levels both developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the European Monetary Union. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries including those of Eastern Europe. The markets in Eastern Europe remain relatively undeveloped and can be particularly sensitive to political and economic developments. The European financial markets have recently experienced volatility and adverse trends due to concerns about rising government debt levels of certain European countries, each of which may require external assistance to meet its obligations and run the risk of default on its debt, possible bail-out by the rest of the European Union or debt restructuring. Assistance given to a European Union member state may be dependent on a country's implementation of reforms in order to curb the risk of default on its debt, and a failure to implement these reforms or increase revenues could result in a deep economic downturn. These events have adversely affected the exchange rate of the euro and therefore may adversely affect the Fund and its investments. On January 31, 2020, the United Kingdom formally withdrew from the EU, which withdrawal is commonly referred to as "Brexit." The Fund faces risks associated with the uncertainty and consequences following Brexit. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions, and could contribute to instability in global political institutions, regulatory agencies and financial markets. Any effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund invests.

 

Geographic Risk Related to Pacific Rim. The Fund will be more susceptible to the economic, market, regulatory, political, natural disasters and local risks of the Pacific Rim region than a fund that is more geographically diversified. The Pacific Rim region includes countries in all stages of economic development; however, it has a higher prevalence of emerging market countries as compared to other regions of the world. The region has historically been highly dependent on global trade, with nations taking strong roles in both the importing and exporting of goods; such a relationship creates a risk with this dependency on global growth. The respective stock markets tend to have a larger prevalence of smaller capitalization companies. Varying levels of accounting and disclosure standards, restrictions on foreign ownership, minority ownership rights, and corporate governance standards are also common for the region.

 

Gold Industry Risk. Investments related to gold are considered speculative and are affected by a variety of worldwide economic, financial and political factors. The price of gold may fluctuate sharply over short periods of time, even during periods of rising prices, due to changes in inflation or expectations regarding inflation in various countries, the availability of supplies, changes in industrial and commercial demand, limited markets, fabricator demand, gold sales by governments, trade imbalances and restrictions, currency devaluation or revaluation, central banks or international agencies, investment speculation, inability to raise capital, increases in production costs, political unrest in nations where sources of gold are located, monetary and other economic policies of various governments and government restrictions on private ownership of gold and mining land.

 

Sector Risk. From time to time, the Fund may invest a significant amount of its total assets in each of certain sectors of the economy. Each of those sectors may be subject to specific risks. These risks include governmental regulation of the sector and governmental monetary and fiscal policies, which may impact interest rates and currencies and affect corporate funding and international trade. Certain sectors may be more vulnerable than others to these factors. In addition, market sentiment and expectations toward a particular sector could affect a company's market valuation and access to equity funding. For example, as of October 31, 2019, 33.5% of the Fund's assets were invested in the consumer non-cyclical sector. Performance of companies in the consumer non-cyclical sector may be adversely impacted by fluctuations in supply and demand, changes in the global economy, consumer spending, competition, demographics and consumer preferences, and production spending. Companies in the consumer non-cyclical sector are also affected by changes in government regulation, global economic, environmental and political events, and economic conditions.

 

Currency Risk. The values of investments in securities denominated in foreign currencies increase or decrease as the rates of exchange between those currencies and the U.S. Dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile and are affected by factors such as general economic conditions, the actions of the United States and foreign governments or central banks, the imposition of currency controls, and speculation.

 

Market Capitalization Risk. Larger, more established companies may be unable to attain the high growth rates of successful, smaller companies during periods of economic expansion. The securities of mid-capitalization companies may be subject to more abrupt or erratic market movements and may have lower trading volumes or more erratic trading than securities of larger, more established companies or market averages in general. In addition, such companies typically are more likely to be adversely affected than large capitalization companies by changes in earning results, business prospects, investor expectations or poor economic or market conditions.

 

Convertible Securities Risk. Convertible securities are subject to market and interest rate risk and credit risk. When the market price of the equity security underlying a convertible security decreases the convertible security tends to trade on the basis of its yield and other fixed income characteristics, and is more susceptible to credit and interest rate risks. When the market price of such equity security rises, the convertible security tends to trade on the basis of its equity conversion features and be more exposed to market risk. Convertible securities are typically issued by smaller capitalized companies with stock prices that may be more volatile than those of other companies.

 

Cybersecurity Risk. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data (including private shareholder information), or proprietary information, or cause the Fund, the Advisor, and/or other service providers (including custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. In an extreme case, a shareholder's ability to exchange or redeem Fund shares may be affected.

 

Emerging Market Risk. Many of the risks with respect to foreign investments are more pronounced for investments in issuers in developing or emerging market countries. Emerging market countries tend to have more government exchange controls, more volatile interest and currency exchange rates, less market regulation, and less developed economic, political and legal systems than those of more developed countries. In addition, emerging market countries may experience high levels of inflation and may have less liquid securities markets and less efficient trading and settlement systems.

 

ETF Risk. Investing in an ETF will provide the Fund with exposure to the securities comprising the index on which the ETF is based and will expose the Fund to risks similar to those of investing directly in those securities. Shares of ETFs typically trade on securities exchanges and may at times trade at a premium or discount to their net asset values. In addition, an ETF may not replicate exactly the performance of the benchmark index it seeks to track for a number of reasons, including transaction costs incurred by the ETF, the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of securities held. Investing in ETFs, which are investment companies, involves duplication of advisory fees and certain other expenses. The Fund will pay brokerage commissions in connection with the purchase and sale of shares of ETFs.

 

Liquidity Risk. The Fund may not be able to sell some or all of the investments that it holds due to a lack of demand in the marketplace or other factors such as market turmoil, or if the Fund is forced to sell an illiquid asset to meet redemption requests or other cash needs it may only be able to sell those investments at a loss. Illiquid assets may also be difficult to value.

 

Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities. If the Fund is not able to sell an option held in its portfolio, it would have to exercise the option to realize any profit and would incur transaction costs upon the purchase or sale of the underlying securities. Ownership of options involves the payment of premiums, which may adversely affect the Fund's performance. To the extent that the Fund invests in over-the-counter options, the Fund may be exposed to counterparty risk.

 

Preferred Stock Risk. Preferred stock represents an equity interest in a company that generally entitles the holder to receive, in preference to the holders of other stocks such as common stock, dividends and a fixed share of the proceeds resulting from a liquidation of the company. The market value of preferred stock is subject to company-specific and market risks applicable generally to equity securities and is also sensitive to changes in the company's creditworthiness, the ability of the company to make payments on the preferred stock, and changes in interest rates, typically declining in value if interest rates rise.

 

Real Estate Investment Trust (REIT) Risk. The Fund's investment in REITs will subject the Fund to risks similar to those associated with direct ownership of real estate, including losses from casualty or condemnation, and changes in local and general economic conditions, supply and demand, interest rates, zoning laws, regulatory limitations on rents, property taxes and operating expenses.

 

Warrants Risk. Warrants may lack a liquid secondary market for resale. The prices of warrants may fluctuate as a result of speculation or other factors. Warrants can provide a greater potential for profit or loss than an equivalent investment in the underlying security. Prices of warrants do not necessarily move in tandem with the prices of their underlying securities and are highly volatile and speculative investments. If a warrant expires without being exercised, the Fund will lose any amount paid for the warrant.
Risk Lose Money [Text] rr_RiskLoseMoney Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of the Fund compare with the average annual total returns of a broad-based market index. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. Updated performance information is available at the Fund's website, www.europacificfunds.com, or by calling the Fund at 1-888-558-5851. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Sales loads are not reflected in the bar chart, and if those changes were included, returns would be less than those shown.

 

The Fund commenced operations on January 10, 2014, after the conversion of a limited liability company account, Spongebob Ventures II LLC, which commenced operations February 28, 2010 (the "Predecessor Account"), into Class I shares of the Fund. The bar chart and the performance table below for the period prior to the commencement of the Fund's operations are for the Predecessor Account. The Fund's objectives, policies, guidelines and restrictions are, in all material respects, equivalent to those of the Predecessor Account. The Predecessor Account was the only fund or account managed by the Fund's advisor with an investment objective and investment policies and restrictions substantially similar to those of the Fund, and the Predecessor Account was managed in substantially the same way as the Fund's advisor manages the Fund. The Predecessor Account was not registered under the Investment Company Act of 1940 (as amended, the "1940 Act"), and therefore was not subject to certain restrictions imposed by the 1940 Act on registered investment companies and by the Internal Revenue Code of 1986 on regulated investment companies. If the Predecessor Account had been registered under the 1940 Act, the Predecessor Account's performance may have been adversely affected. For the periods prior to the conversion, returns for Class I shares reflect all charges, expenses, and fees of the Predecessor Account. Returns for Class A shares have been adjusted to reflect the estimated gross annual operating expenses of Class A shares of the Fund as of the date of the conversion.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of the Fund compare with the average annual total returns of a broad-based market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-558-5851
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.europacificfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return (before taxes) for Class A Shares For each calendar year at NAV
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales loads are not reflected in the bar chart, and if those changes were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Class A Shares    
Highest Calendar Quarter Return at NAV 10.86% Quarter Ended 03/31/2012
Lowest Calendar Quarter Return at NAV (16.52)% Quarter Ended 09/30/2011
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended December 31, 2019)
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 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 A Shares only and after-tax returns for classes other than Class A will vary from returns shown for Class A.
EuroPac International Dividend Income Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPDPX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 0.85%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.46%
Other expenses rr_OtherExpensesOverAssets 0.55%
Total annual fund operating expenses rr_ExpensesOverAssets 1.65%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.15%) [6]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.50% [6]
One Year rr_ExpenseExampleYear01 $ 596
Three Years rr_ExpenseExampleYear03 933
Five Years rr_ExpenseExampleYear05 1,293
Ten Years rr_ExpenseExampleYear10 $ 2,305
Annual Return 2011 rr_AnnualReturn2011 (6.83%)
Annual Return 2012 rr_AnnualReturn2012 16.60%
Annual Return 2013 rr_AnnualReturn2013 7.91%
Annual Return 2014 rr_AnnualReturn2014 (2.97%)
Annual Return 2015 rr_AnnualReturn2015 (19.42%)
Annual Return 2016 rr_AnnualReturn2016 5.23%
Annual Return 2017 rr_AnnualReturn2017 15.53%
Annual Return 2018 rr_AnnualReturn2018 (11.03%)
Annual Return 2019 rr_AnnualReturn2019 13.04%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Calendar Quarter Return at NAV
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Calendar Quarter Return at NAV
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.52%)
1 Year rr_AverageAnnualReturnYear01 8.02%
5 Years rr_AverageAnnualReturnYear05 (1.21%)
Since Inception rr_AverageAnnualReturnSinceInception 3.16%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2010
EuroPac International Dividend Income Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPDIX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 0.85%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.46%
Other expenses rr_OtherExpensesOverAssets 0.55%
Total annual fund operating expenses rr_ExpensesOverAssets 1.40%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.15%) [6]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.25% [6]
One Year rr_ExpenseExampleYear01 $ 127
Three Years rr_ExpenseExampleYear03 428
Five Years rr_ExpenseExampleYear05 752
Ten Years rr_ExpenseExampleYear10 $ 1,667
1 Year rr_AverageAnnualReturnYear01 13.32%
5 Years rr_AverageAnnualReturnYear05 (0.05%)
Since Inception rr_AverageAnnualReturnSinceInception 3.89%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2010
EuroPac International Dividend Income Fund | After Taxes on Distributions | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 7.68% [3]
5 Years rr_AverageAnnualReturnYear05 (1.57%) [3]
Since Inception rr_AverageAnnualReturnSinceInception 2.83% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2010 [3]
EuroPac International Dividend Income Fund | After Taxes on Distributions and Sales | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 5.47% [3]
5 Years rr_AverageAnnualReturnYear05 (0.71%) [3]
Since Inception rr_AverageAnnualReturnSinceInception 2.58% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2010 [3]
EuroPac International Dividend Income Fund | S&P International Dividend Opportunities Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 20.49%
5 Years rr_AverageAnnualReturnYear05 4.22%
Since Inception rr_AverageAnnualReturnSinceInception 3.25%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2010
EP Emerging Markets Small Companies Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION – EP Emerging Markets Small Companies Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the EP Emerging Markets Small Companies Fund (the "Fund") is to seek long term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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 if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional and in the section titled "Sales Charge Schedule" on page 56 of this prospectus and in "APPENDIX A – Waivers and Discounts Available from Intermediaries" of the Prospectus.
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 your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2021
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 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 the most recent fiscal year, the Fund's portfolio turnover rate was 45% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 45.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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. The example 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 operating expenses remain the same. The example reflects the Fund's contractual fee waiver and/or expense reimbursement only for the term of the contractual fee waiver and/or expense reimbursement. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund seeks to achieve its investment objective by investing at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of small capitalization companies that are tied economically to emerging market countries. The Fund's sub-advisor defines small capitalization companies as those companies with market capitalizations, at the time of investment, of below $5 billion. The Fund's sub-advisor considers emerging market countries to be those countries that are, at the time of investment, included in the MSCI Emerging Markets Index. The Fund's sub-advisor considers a company to be economically tied to an emerging market country if (1) the company is organized under the laws of an emerging market country, or has its principal office in an emerging market country; (2) at the time of investment, the company derived at least 50% of its total revenues or profits during its most recently completed fiscal year from business activities in an emerging market country; or (3) the company's equity securities are primarily traded on an exchange in an emerging market country. The sub-advisor expects that from time to time the Fund will invest significant portions of its assets in the Asian and Latin American regions. The sub-advisor focuses the Fund's investments on small-capitalization companies that the sub-advisor believes are financially sound and stable but growing and make dividend distributions. The Fund's investments in equity securities may include common stock, preferred stocks, convertible stock and warrants. Certain of the Fund's investments may be considered restricted securities.
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Risk is inherent in all investing. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objective.

 

Management and Strategy Risk. The value of your investment depends on the judgment of the 'Fund's advisor or sub-advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect.

 

Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

 

Equity Risk. The value of the equity securities held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or factors relating to specific companies in which the Fund invests.

 

Foreign Investment Risk. The prices of foreign securities may be more volatile than the prices of securities of U.S. issuers because of economic and social conditions abroad, political developments, and changes in the regulatory environments of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the values of the Fund's foreign investments. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms.

 

Emerging Market Risk. Many of the risks with respect to foreign investments are more pronounced for investments in issuers in developing or emerging market countries. Emerging market countries tend to have more government exchange controls, more volatile interest and currency exchange rates, less market regulation, and less developed economic, political and legal systems than those of more developed countries. In addition, emerging market countries may experience high levels of inflation and may have less liquid securities markets and less efficient trading and settlement systems.

 

Small-Cap Company Risk. Investments in securities of small capitalization companies may involve greater risks than investing in large capitalization companies because small sized companies generally have limited track records and their shares tend to trade infrequently or in limited volumes. Additionally, investment in common stocks, particularly small sized company stocks, can be volatile and cause the value of the Fund's shares to go up and down, sometimes dramatically.

 

Geographic Concentration Risk. A fund that is less diversified across countries or geographic regions is generally riskier than a more geographically diversified fund. Investments in a single region, even though representing a number of different countries within the region, may be affected by common economic forces and other factors. This vulnerability to factors affecting the value of investments is significantly greater for a fund that concentrates its investment in a particular region or regions than a more geographically diversified fund, and may result in greater losses and volatility. The economies and financial markets of certain regions, such as Latin America, Asia or Eastern Europe, can be interdependent and may decline all at the same time.

 

Sector Risk. From time to time, the Fund may invest a significant amount of its total assets in each of certain sectors of the economy. Each of those sectors may be subject to specific risks. These risks include governmental regulation of the sector and governmental monetary and fiscal policies, which may impact interest rates and currencies and affect corporate funding and international trade. Certain sectors may be more vulnerable than others to these factors. In addition, market sentiment and expectations toward a particular sector could affect a company's market valuation and access to equity funding. For example, as of October 31, 2019, 24.5% of the Fund's assets were invested in the consumer non-cyclical sector. Performance of companies in the consumer non-cyclical sector may be adversely impacted by fluctuations in supply and demand, changes in the global economy, consumer spending, competition, demographics and consumer preferences, and production spending. Companies in the consumer non-cyclical sector are also affected by changes in government regulation, global economic, environmental and political events, and economic conditions.

 

Asia Region Risk. There are specific risks associated with investing in the Asia region, including the risk of political, economic, social and religious instability. The Asian region, and particularly China, Japan and South Korea, may be adversely affected by political, military, economic and other factors related to North Korea. In addition, China's long running conflict over Taiwan, border disputes with many of its neighbors and historically strained relations with Japan could adversely impact economies in the region. From time to time and as recently as January 2020, China has experienced outbreaks of infectious illnesses, and the country may be subject to other public health threats, infectious illnesses, diseases or similar issues in the future. Any spread of an infectious illness, public health threat or similar issue could reduce consumer demand or economic output, result in market closures, travel restrictions or quarantines, and generally have a significant impact on the Chinese economy and the economies in the region. The economies of many Asian countries differ from the economies of more developed countries in many respects.

 

Latin America Region Risk. Because the Fund's sub-advisor intends to focus the Fund's Latin America Region investments in Brazil, Mexico, Argentina, Colombia, Peru and Chile, the Fund's performance may be affected by social, political, and economic conditions within these countries and the region. In addition, the economy of each of these countries is generally characterized by high interest, inflation and unemployment rates. Currency fluctuations or devaluations in any country in the region can have a significant effect on the entire region. Because commodities such as agricultural products, minerals, oil, and metals represent a significant percentage of exports of many Latin American countries, the economies of those countries are particularly sensitive to fluctuations in commodity prices, currencies and global demand for commodities.

 

Currency Risk. The values of investments in securities denominated in foreign currencies increase or decrease as the rates of exchange between those currencies and the U.S. Dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile and are affected by factors such as general economic conditions, the actions of the United States and foreign governments or central banks, the imposition of currency controls, and speculation.

 

Convertible Securities Risk. Convertible securities are subject to market and interest rate risk and credit risk. When the market price of the equity security underlying a convertible security decreases the convertible security tends to trade on the basis of its yield and other fixed income characteristics, and is more susceptible to credit and interest rate risks. When the market price of such equity security rises, the convertible security tends to trade on the basis of its equity conversion features and be more exposed to market risk. Convertible securities are typically issued by smaller capitalized companies with stock prices that may be more volatile than those of other companies.

 

Cybersecurity Risk. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data (including private shareholder information), or proprietary information, or cause the Fund, the Advisor, and/or other service providers (including custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. In an extreme case, a shareholder's ability to exchange or redeem Fund shares may be affected.

 

Liquidity Risk. The Fund may not be able to sell some or all of the investments that it holds due to a lack of demand in the marketplace or other factors such as market turmoil, or if the Fund is forced to sell an illiquid asset to meet redemption requests or other cash needs it may only be able to sell those investments at a loss. Illiquid assets may also be difficult to value.

 

Preferred Stock Risk. Preferred stock represents an equity interest in a company that generally entitles the holder to receive, in preference to the holders of other stocks such as common stock, dividends and a fixed share of the proceeds resulting from a liquidation of the company. The market value of preferred stock is subject to company-specific and market risks applicable generally to equity securities and is also sensitive to changes in the company's creditworthiness, the ability of the company to make payments on the preferred stock, and changes in interest rates, typically declining in value if interest rates rise.

 

Warrants Risk. Warrants may lack a liquid secondary market for resale. The prices of warrants may fluctuate as a result of speculation or other factors. Warrants can provide a greater potential for profit or loss than an equivalent investment in the underlying security. Prices of warrants do not necessarily move in tandem with the prices of their underlying securities and are highly volatile and speculative investments. If a warrant expires without being exercised, the Fund will lose any amount paid for the warrant.

 

Private Placements and Restricted Securities Risk. Private placements and other restricted securities may be considered illiquid securities. Private placements typically are subject to restrictions on resale as a matter of contract or under federal securities laws. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund could find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held. The absence of a liquid trading market may also make it difficult to determine the fair value of such securities for purposes of computing the Fund's net asset value.
Risk Lose Money [Text] rr_RiskLoseMoney Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of shares of the Fund compare with the average annual total returns of a broad-based market index. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. Updated performance information is available at the Fund's website, www.europacificfunds.com, or by calling the Fund at 1-888-558-5851. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Class A shares and Class I shares are invested in the same portfolio of securities. Sales loads are not reflected in the bar chart, and if those charges were included, returns would be less than those shown. On August 31, 2015, the Fund's investment strategy changed. Accordingly, effective August 31, 2015, the Fund's performance benchmark is the MSCI EM Small Cap Index. The Fund's sub-advisor believes this index is a better performance benchmark for comparison to the Fund's performance in light of its investment strategy.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of each class of shares of the Fund compare with the average annual total returns of a broad-based market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-558-5851
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.europacificfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return (before taxes) for Class A Shares For each calendar year at NAV
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales loads are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Class A Shares    
Highest Calendar Quarter Return at NAV 19.92% Quarter Ended 03/31/2012
Lowest Calendar Quarter Return at NAV (22.86)% Quarter Ended 09/30/2011
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended December 31, 2019)
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 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 A Shares only and after-tax returns for classes other than Class A will vary from returns shown for Class A.
EP Emerging Markets Small Companies Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPASX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 1.08%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.08%
All other expenses rr_Component2OtherExpensesOverAssets 0.66%
Other expenses rr_OtherExpensesOverAssets 0.74%
Total annual fund operating expenses rr_ExpensesOverAssets 2.07%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.32%) [1]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.75% [1]
One Year rr_ExpenseExampleYear01 $ 620
Three Years rr_ExpenseExampleYear03 1,040
Five Years rr_ExpenseExampleYear05 1,485
Ten Years rr_ExpenseExampleYear10 $ 2,718
Annual Return 2011 rr_AnnualReturn2011 (19.57%)
Annual Return 2012 rr_AnnualReturn2012 42.99%
Annual Return 2013 rr_AnnualReturn2013 7.20%
Annual Return 2014 rr_AnnualReturn2014 2.72%
Annual Return 2015 rr_AnnualReturn2015 (12.15%)
Annual Return 2016 rr_AnnualReturn2016 4.85%
Annual Return 2017 rr_AnnualReturn2017 34.38%
Annual Return 2018 rr_AnnualReturn2018 (21.44%)
Annual Return 2019 rr_AnnualReturn2019 14.66%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Calendar Quarter Return at NAV
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.92%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Calendar Quarter Return at NAV
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.86%)
1 Year rr_AverageAnnualReturnYear01 9.55%
5 Years rr_AverageAnnualReturnYear05 1.27%
Since Inception rr_AverageAnnualReturnSinceInception 3.31%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2010
EP Emerging Markets Small Companies Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPEIX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 1.08%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.08%
All other expenses rr_Component2OtherExpensesOverAssets 0.66%
Other expenses rr_OtherExpensesOverAssets 0.74%
Total annual fund operating expenses rr_ExpensesOverAssets 1.82%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.32%) [1]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.50% [1]
One Year rr_ExpenseExampleYear01 $ 153
Three Years rr_ExpenseExampleYear03 541
Five Years rr_ExpenseExampleYear05 955
Ten Years rr_ExpenseExampleYear10 $ 2,111
1 Year rr_AverageAnnualReturnYear01 14.91% [7]
5 Years rr_AverageAnnualReturnYear05 2.46% [7]
Since Inception rr_AverageAnnualReturnSinceInception 4.10% [7]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 16, 2013 [7]
EP Emerging Markets Small Companies Fund | After Taxes on Distributions | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 9.51% [3]
5 Years rr_AverageAnnualReturnYear05 0.43% [3]
Since Inception rr_AverageAnnualReturnSinceInception 2.77% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2010 [3]
EP Emerging Markets Small Companies Fund | After Taxes on Distributions and Sales | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 5.68% [3]
5 Years rr_AverageAnnualReturnYear05 0.91% [3]
Since Inception rr_AverageAnnualReturnSinceInception 2.59% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2010 [3]
EP Emerging Markets Small Companies Fund | MSCI EM Small Cap Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 11.50%
5 Years rr_AverageAnnualReturnYear05 2.97%
Since Inception rr_AverageAnnualReturnSinceInception 1.02%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2010
EP Emerging Markets Small Companies Fund | MSCI All Country Asia Ex-Japan Small Cap Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 7.23%
5 Years rr_AverageAnnualReturnYear05 1.83%
Since Inception rr_AverageAnnualReturnSinceInception 1.14%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2010
EuroPac Gold Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION – EuroPac Gold Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the EuroPac Gold Fund (the "Fund") is to seek long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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 if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional and in the section titled "Sales Charge Schedule" on page 56 of this prospectus and in "APPENDIX A – Waivers and Discounts Available from Intermediaries" of the Prospectus.
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 your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2021
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 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 the most recent fiscal year, the Fund's portfolio turnover rate was 18% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 18.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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. The example 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 operating expenses remain the same. The example reflects the Fund's contractual fee waiver and/or expense reimbursement only for the term of the contractual fee waiver and/or expense reimbursement. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in the securities of gold companies located in Europe and the Pacific Rim. The Fund's advisor defines securities of gold companies as equity securities of companies that derive at least 50% of gross revenue or profit from mining, processing, or dealing and investing in gold, as well as companies whose primary business is exploring for gold or that provide services to the gold industry. The advisor considers a country to be part of Europe if it is included in the MSCI All Country Europe Index and part of the Pacific Rim if any of its borders touches the Pacific Ocean. The Fund also invests in shares of exchange-traded funds ("ETFs") and closed end funds that invest in gold bullion. ETFs are pooled investment vehicles that trade on exchanges. The advisor considers a company to be located in Europe or the Pacific Rim if (1) the company is organized under the laws of a country that is a part of Europe or the Pacific Rim or has its principal office in a country that is a part of Europe or the Pacific Rim; (2) at the time of investment, the company derived a significant portion (i.e., 50% or more) of its total revenues during its most recent completed fiscal year from business activities in Europe or the Pacific Rim; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets in Europe or the Pacific Rim. The Fund will invest primarily in non-U.S. companies. The Advisor considers a company to be a non-U.S. company if (1) the company is organized under the laws of a country, or has its principal office in a country, other than the United States; (2) at the time of investment, the company derived at least 50% of its total revenues during its most recent completed fiscal year from business activities outside of the United States; or (3) the company's equity securities are traded principally on stock exchanges or over-the-counter markets outside of the United States. The Fund may also invest in American and Global Depository Receipts ("ADRs" and "GDRs"), including unsponsored ADRs. The Fund may invest up to 20% of its net assets in the equity securities of other precious metals companies, such as silver, platinum and palladium companies. The Fund may invest up to 15% of its net assets in private placements and other restricted securities.

 

The Fund concentrates its investments in companies engaged in the gold industry. The Fund invests in large-, mid-, small-, and micro-capitalization companies that are considered by the Fund's advisor to be attractively valued.

 

The Fund may also use derivative instruments, primarily writing (i.e., selling) put options on individual securities, indexes and ETFs, to manage the position size of individual security holdings, and to seek to enhance the Fund's return and reduce volatility. The Fund will generally invest in derivatives to seek to manage underlying equity exposures while seeking to maximize the efficiency of invested capital and expected return. When evaluating options, the Fund's advisor considers the amount of premium received or invested (which is a function of the implied volatility of the underlying security, the strike price, and the time to expiration), the valuation of the underlying security at the exercise price, the weighting of the security in the portfolio if exercised, and the expiration date. In addition, the Fund may write (sell) covered call options on securities the Fund holds in its portfolio.

 

In selecting investments for the Fund, the Fund's advisor employs a long-term value orientation, looking for companies selling at attractive prices that can be held for a long time horizon. The advisor's overall approach to investment management involves several key factors. First, the global universe is used to screen potential European and Pacific Rim investments. Second, the advisor identifies securities of companies in the gold or other precious metals sector that it believes are valued at a low price in relation to their book value or earnings, or at a discount to future book value given the likelihood the company will be able to increase resources through exploration. Lastly, a long-term investment horizon (five years) is applied to give investments time to realize full value. In investing in growth and more speculative investments, such as exploration, the advisor looks for companies with a risk-mitigating approach to these inherently risky activities. Ultimately, the advisor seeks to construct a portfolio with a solid long-term foundation in which growth and more speculative investments are added.
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Risk is inherent in all investing. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objective.

 

Management and Strategy Risk. The value of your investment depends on the judgment of the 'Fund's advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect.

 

Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

 

Equity Risk. The value of the equity securities held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or factors relating to specific companies in which the Fund invests.

 

Risks Related to the Gold and Precious Metals Industries. Because the Fund's investments are concentrated in the gold industry and because the fund may invest a significant amount of its assets in the precious metals industry, its performance will be significantly affected by developments in those industries. The Fund may be subject to greater risks and market fluctuations than a fund whose portfolio has exposure to a broader range of industries or sectors. Investments related to gold and other precious metals are considered speculative and are affected by a variety of worldwide economic, financial and political factors. The price of gold and other precious metals may fluctuate sharply over short periods of time, even during periods of rising prices, due to changes in inflation or expectations regarding inflation in various countries, the availability of supplies, changes in industrial and commercial demand, limited markets, fabricator demand, gold sales by governments, trade imbalances and restrictions, currency devaluation or revaluation, central banks or international agencies, investment speculation, inability to raise capital, increases in production costs, political unrest in nations where sources of precious metals are located, monetary and other economic policies of various governments and government restrictions on private ownership of precious metals and mining land. Therefore, markets are volatile at times, and there may be sharp fluctuations in prices even during periods of rising prices. The metals industry can be significantly affected by events relating to international political developments, the success of exploration projects, commodity prices and tax and government regulations.

 

Private Placements and Restricted Securities Risk. Private placements and other restricted securities may be considered illiquid securities. Private placements typically are subject to restrictions on resale as a matter of contract or under federal securities laws. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund could find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held. The absence of a liquid trading market may also make it difficult to determine the fair value of such securities for purposes of computing the Fund's net asset value.

 

Foreign Investment Risk. The prices of foreign securities may be more volatile than the prices of securities of U.S. issuers because of economic and social conditions abroad, political developments, and changes in the regulatory environments of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the values of the Fund's foreign investments. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms. Foreign securities include American Depository Receipts ("ADRs") and Global Depository Receipts ("GDRs"). Unsponsored ADRs and GDRs are organized independently and without the cooperation of the foreign issuer of the underlying securities, and involve additional risks because U.S. reporting requirements do not apply. In addition, the issuing bank may deduct shareholder distribution, custody, foreign currency exchange, and other fees from the payment of dividends.

 

Market Capitalization Risk. Larger, more established companies may be unable to attain the high growth rates of successful, smaller companies during periods of economic expansion. The securities of micro-capitalization, small-capitalization and mid-capitalization companies may be subject to more abrupt or erratic market movements and may have lower trading volumes or more erratic trading than securities of larger, more established companies or market averages in general. In addition, such companies typically are more likely to be adversely affected than large capitalization companies by changes in earning results, business prospects, investor expectations or poor economic or market conditions.

 

Geographic Concentration Risk. A fund that is less diversified across countries or geographic regions is generally riskier than a more geographically diversified fund. Investments in a single region, even though representing a number of different countries within the region, may be affected by common economic forces and other factors. This vulnerability to factors affecting the value of investments is significantly greater for a fund that concentrates its investment in a particular region or regions than a more geographically diversified fund, and may result in greater losses and volatility. The economies and financial markets of certain regions, such as Latin America, Asia or Eastern Europe, can be interdependent and may decline all at the same time.

 

Geographic Risk Related to Europe. The Fund will be more susceptible to the economic, market, political and local risks of the European region than a fund that is more geographically diversified. Europe includes both developed and emerging markets. Most Western European countries are members of the European Union, which imposes restrictions on inflation rates, deficits and debt levels. Both developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the European Monetary Union. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries including those of Eastern Europe. The markets in Eastern Europe remain relatively undeveloped and can be particularly sensitive to political and economic developments. The European financial markets have recently experienced volatility and adverse trends due to concerns about rising government debt levels of certain European countries, each of which may require external assistance to meet its obligations and run the risk of default on its debt, possible bail-out by the rest of the European Union or debt restructuring. Assistance given to a European Union member state may be dependent on a country's implementation of reforms in order to curb the risk of default on its debt, and a failure to implement these reforms or increase revenues could result in a deep economic downturn. These events have adversely affected the exchange rate of the euro and therefore may adversely affect the Fund and its investments. On January 31, 2020, the United Kingdom formally withdrew from the EU, which withdrawal is commonly referred to as "Brexit." The Fund faces risks associated with the uncertainty and consequences following Brexit. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions, and could contribute to instability in global political institutions, regulatory agencies and financial markets. Any effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets in which the Fund invests.

 

Geographic Risk Related to Pacific Rim. The Fund will be more susceptible to the economic, market, regulatory, political, natural disasters and local risks of the Pacific Rim region than a fund that is more geographically diversified. The Pacific Rim region includes countries in all stages of economic development; however, it has a higher prevalence of emerging market countries as compared to other regions of the world. The region has historically been highly dependent on global trade, with nations taking strong roles in both the importing and exporting of goods; such a relationship creates a risk with this dependency on global growth. The respective stock markets tend to have a larger prevalence of smaller capitalization companies. Varying levels of accounting and disclosure standards, restrictions on foreign ownership, minority ownership rights, and corporate governance standards are also common for the region.

 

Covered Call Options Risk. The Fund may write (sell) covered call options on securities the Fund holds in its portfolio. This strategy is designed to generate additional gains from option premiums, but also results in certain risks. With respect to portfolio holdings on which the Fund has written a covered call option, the Fund will forgo the opportunity to benefit from potential increases in the value of that security, but will continue to bear the risk of declines in the value of the security.

 

Currency Risk. The values of investments in securities denominated in foreign currencies increase or decrease as the rates of exchange between those currencies and the U.S. Dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile and are affected by factors such as general economic conditions, the actions of the United States and foreign governments or central banks, the imposition of currency controls, and speculation.

 

Cybersecurity Risk. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data (including private shareholder information), or proprietary information, or cause the Fund, the Advisor, and/or other service providers (including custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. In an extreme case, a shareholder's ability to exchange or redeem Fund shares may be affected.

 

Derivatives Risk. Derivatives include instruments and contracts that are based on and valued in relation to one or more underlying securities, financial benchmarks, indices, or other reference obligations or measures of value. Major types of derivatives include futures, options, swaps and forward contracts. Using derivatives can have a leveraging effect and increase fund volatility. Derivatives transactions can be highly illiquid and difficult to unwind or value, and changes in the value of a derivative held by the Fund may not correlate with the value of the underlying instrument or the Fund's other investments. Many of the risks applicable to trading the instruments underlying derivatives are also applicable to derivatives trading. However, additional risks are associated with derivatives trading that are possibly greater than the risks associated with investing directly in the underlying instruments. These additional risks include but are not limited to, illiquidity risk and counterparty credit risk. For derivatives that are required to be cleared by a regulated clearinghouse, other risks may arise from the Fund's relationship with a brokerage firm through which it submits derivatives trades for clearing, including in some cases from other clearing customers of the brokerage firm.

 

Emerging Market Risk. Many of the risks with respect to foreign investments are more pronounced for investments in issuers in developing or emerging market countries. Emerging market countries tend to have more government exchange controls, more volatile interest and currency exchange rates, less market regulation, and less developed economic, political and legal systems than those of more developed countries. In addition, emerging market countries may experience high levels of inflation and may have less liquid securities markets and less efficient trading and settlement systems.

 

ETF Risk. Investing in an ETF will provide the Fund with exposure to the securities comprising the index on which the ETF is based and will expose the Fund to risks similar to those of investing directly in those securities. Shares of ETFs typically trade on securities exchanges and may at times trade at a premium or discount to their net asset values. In addition, an ETF may not replicate exactly the performance of the benchmark index it seeks to track for a number of reasons, including transaction costs incurred by the ETF, the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of securities held. Investing in ETFs, which are investment companies, involves duplication of advisory fees and certain other expenses. The Fund will pay brokerage commissions in connection with the purchase and sale of shares of ETFs.

 

Liquidity Risk. The Fund may not be able to sell some or all of the investments that it holds due to a lack of demand in the marketplace or other factors such as market turmoil, or if the Fund is forced to sell an illiquid asset to meet redemption requests or other cash needs it may only be able to sell those investments at a loss. Illiquid assets may also be difficult to value.

 

Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities. If the Fund is not able to sell an option held in its portfolio, it would have to exercise the option to realize any profit and would incur transaction costs upon the purchase or sale of the underlying securities. Ownership of options involves the payment of premiums, which may adversely affect the Fund's performance. To the extent that the Fund invests in over-the-counter options, the Fund may be exposed to counterparty risk.

 

Tax Risk. In order to qualify for the favorable U.S. federal income tax treatment accorded to regulated investment companies, the Fund must, among other requirements, derive at least 90% of its gross income in each taxable year from certain categories of income ("qualifying income"). Certain of the Fund's investments may generate income that is not qualifying income. If the Fund were to fail to meet the qualifying income test and fail to qualify as a regulated investment company, it would be taxed in the same manner as an ordinary corporation, and distributions to its shareholders would not be deductible by the Fund in computing its taxable income.

 

The Fund may hold equity interests in certain foreign entities treated as "passive foreign investment companies" ("PFICs") for U.S. federal income tax purposes. Certain foreign mining corporations in which the Fund invests may be treated as PFICs. If the Fund invests in PFICs, it may be subject to U.S. federal income tax on a portion of any "excess distribution" or gain from the disposition of such shares regardless of whether the Fund distributes substantially all of its income to shareholders. Additional charges in the nature of interest may be imposed with respect to deferred taxes arising from such distributions or gains. Capital gains on the sale of such holdings may be deemed to be ordinary income regardless of how long such PFICs are held. A "qualified electing fund" election or a "mark to market" election may generally be available that would ameliorate these adverse tax consequences, but such elections could require the Fund to recognize taxable income or gain (subject to the distribution requirements applicable to regulated investment companies) without the concurrent receipt of cash. In order to satisfy the distribution requirements and avoid a tax on the Fund, the Fund may be required to liquidate portfolio securities that it might otherwise have continued to hold, potentially resulting in additional taxable gain or loss to the Fund. Under proposed Treasury Regulations, certain income derived by the Fund for a taxable year from a PFIC with respect to which the Fund has made a qualified electing fund election would generally constitute qualifying income for purposes of the 90% test described above, only to the extent the PFIC makes distributions in respect of that income to the Fund for that taxable year.
Risk Lose Money [Text] rr_RiskLoseMoney Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of Class A shares of the Fund compare with the average annual total returns of a broad-based market index. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. Updated performance information is available at the Fund's website, www.europacificfunds.com, or by calling the Fund at 1-888-558-5851. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Sales loads are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for Class A shares and by showing how the average annual total returns of Class A shares of the Fund compare with the average annual total returns of a broad-based market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-558-5851
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.europacificfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return (before taxes) for Class A Shares For each calendar year at NAV
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales loads are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Class A Shares    
Highest Calendar Quarter Return at NAV 54.86% Quarter Ended 06/30/2016
Lowest Calendar Quarter Return at NAV (21.67)% Quarter Ended 09/30/2015
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended December 31, 2019)
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 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.
EuroPac Gold Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPGFX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.38%
Other expenses rr_OtherExpensesOverAssets 0.47%
Total annual fund operating expenses rr_ExpensesOverAssets 1.52%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.02%) [8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.50% [8]
One Year rr_ExpenseExampleYear01 $ 596
Three Years rr_ExpenseExampleYear03 907
Five Years rr_ExpenseExampleYear05 1,240
Ten Years rr_ExpenseExampleYear10 $ 2,179
Annual Return 2014 rr_AnnualReturn2014 (10.82%)
Annual Return 2015 rr_AnnualReturn2015 (26.65%)
Annual Return 2016 rr_AnnualReturn2016 73.02%
Annual Return 2017 rr_AnnualReturn2017 12.67%
Annual Return 2018 rr_AnnualReturn2018 (13.85%)
Annual Return 2019 rr_AnnualReturn2019 37.25%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Calendar Quarter Return at NAV
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 54.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Calendar Quarter Return at NAV
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.67%)
1 Year rr_AverageAnnualReturnYear01 31.09%
5 Years rr_AverageAnnualReturnYear05 10.05%
Since Inception rr_AverageAnnualReturnSinceInception 3.31%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 19, 2013
EuroPac Gold Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EPGIX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Wire Fee imst_Wirefee $ 20
Overnight check delivery fee imst_Overnightcheckdeliveryfee 25
Retirement account fees (annual maintenance fee) imst_Retirementaccountfees $ 15
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder service fees rr_Component1OtherExpensesOverAssets 0.09%
All other expenses rr_Component2OtherExpensesOverAssets 0.38%
Other expenses rr_OtherExpensesOverAssets 0.47%
Total annual fund operating expenses rr_ExpensesOverAssets 1.27%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.02%) [8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.25% [8]
One Year rr_ExpenseExampleYear01 $ 127
Three Years rr_ExpenseExampleYear03 401
Five Years rr_ExpenseExampleYear05 695
Ten Years rr_ExpenseExampleYear10 $ 1,532
1 Year rr_AverageAnnualReturnYear01 37.47% [9]
5 Years rr_AverageAnnualReturnYear05 11.14% [9]
Since Inception rr_AverageAnnualReturnSinceInception 4.09% [9]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 20, 2018 [9]
EuroPac Gold Fund | After Taxes on Distributions | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 31.09% [10]
5 Years rr_AverageAnnualReturnYear05 8.50% [10]
Since Inception rr_AverageAnnualReturnSinceInception 2.14% [10]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 19, 2013 [10]
EuroPac Gold Fund | After Taxes on Distributions and Sales | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 18.40% [10]
5 Years rr_AverageAnnualReturnYear05 7.14% [10]
Since Inception rr_AverageAnnualReturnSinceInception 1.96% [10]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 19, 2013 [10]
EuroPac Gold Fund | Philadelphia Gold & Silver Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 52.89%
5 Years rr_AverageAnnualReturnYear05 10.11%
Since Inception rr_AverageAnnualReturnSinceInception 2.83%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 19, 2013
EuroPac Gold Fund | NYSE ARCA Gold Miners Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 39.72%
5 Years rr_AverageAnnualReturnYear05 9.92%
Since Inception rr_AverageAnnualReturnSinceInception 2.24%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 19, 2013
[1] The Fund's advisor has contractually agreed to waive its fees and/or pay for operating expenses of the Fund to ensure that total annual fund operating expenses (excluding any taxes, leverage interest, brokerage commissions, dividend and interest expenses on short sales, acquired fund fees and expenses (as determined in accordance with SEC Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.75% and 1.50% of the average daily net assets of Class A and Class I shares of the Fund, respectively. This agreement is in effect until February 28, 2021, and it may be terminated before that date only by the Trust's Board of Trustees. The Fund's advisor is permitted to seek reimbursement from the Fund, subject to certain limitations, of fees waived or payments made to the Fund for a period ending three full fiscal years after the date of the waiver or payment. This reimbursement may be requested from the Fund if the reimbursement will not cause the Fund's annual expense ratio to exceed the lesser of (a) the expense limitation in effect at the time such fees were waived or payments made, or (b) the expense limitation in effect at the time of the reimbursement.
[2] Class A shares were first offered on April 7, 2010. Class I shares were first offered on July 16, 2013. The performance figures for Class I include the performance for the Class A for the periods prior to the start date of Class I. Class A imposes higher expenses than Class I.
[3] 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. 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. After-tax returns are shown for Class A Shares only and after-tax returns for classes other than Class A will vary from returns shown for Class A.
[4] The Fund's advisor has contractually agreed to waive its fees and/or pay for operating expenses of the Fund to ensure that total annual fund operating expenses (excluding any taxes, leverage interest, brokerage commissions, dividend and interest expenses on short sales, acquired fund fees and expenses (as determined in accordance with SEC Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.15% and 0.90% of the average daily net assets of Class A and Class I shares of the Fund, respectively. This agreement is in effect until February 28, 2021, and it may be terminated before that date only by the Trust's Board of Trustees. The Fund's advisor is permitted to seek reimbursement from the Fund, subject to certain limitations, of fees waived or payments made to the Fund for a period ending three full fiscal years after the date of the waiver or payment. This reimbursement may be requested from the Fund if the reimbursement will not cause the Fund's annual expense ratio to exceed the lesser of (a) the expense limitation in effect at the time such fees were waived or payments made, or (b) the expense limitation in effect at the time of the reimbursement.
[5] Class A shares were first offered on November 15, 2010. Class I were first offered on July 16, 2013. The performance figures for Class I include the performance for the Class A for the periods prior to the start date of Class I. Class A imposes higher expenses than Class I.
[6] The Fund's advisor has contractually agreed to waive its fees and/or pay for operating expenses of the Fund to ensure that total annual fund operating expenses (excluding any taxes, leverage interest, brokerage commissions, dividend and interest expenses on short sales, acquired fund fees and expenses (as determined in accordance with SEC Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.50% and 1.25% of the average daily net assets of Class A and Class I shares of the Fund, respectively. This agreement is in effect until February 28, 2021, and it may be terminated before that date only by the Trust's Board of Trustees. The Fund's advisor is permitted to seek reimbursement from the Fund, subject to certain limitations, of fees waived or payments made to the Fund for a period ending three full fiscal years after the date of the waiver or payment. This reimbursement may be requested from the Fund if the reimbursement will not cause the Fund's annual expense ratio to exceed the lesser of (a) the expense limitation in effect at the time such fees were waived or payments made, or (b) the expense limitation in effect at the time of the reimbursement.
[7] Class A shares were first offered on December 1, 2010. Class I were first offered on July 16, 2013. The performance figures for Class I include the performance for the Class A for the periods prior to the start date of Class I. Class A imposes higher expenses than Class I.
[8] The Fund's advisor has contractually agreed to waive its fees and/or pay for operating expenses of the Fund to ensure that total annual fund operating expenses (excluding any taxes, leverage interest, brokerage commissions, dividend and interest expenses on short sales, acquired fund fees and expenses (as determined in accordance with SEC Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.50% and 1.25% of average daily net assets of Class A and Class I shares of the Fund, respectively. This agreement is in effect until February 28, 2021, and it may be terminated before that date only by the Trust's Board of Trustees. The Fund's advisor is permitted to seek reimbursement from the Fund, subject to certain limitations, of fees waived or payments made to the Fund for a period ending three full fiscal years after the date of the waiver or payment. This reimbursement may be requested from the Fund if the reimbursement will not cause the Fund's annual expense ratio to exceed the lesser of (a) the expense limitation in effect at the time such fees were waived or payments made, or (b) the expense limitation in effect at the time of the reimbursement.
[9] Class A shares were first offered on July 19, 2013. Class I shares were first offered on November 20, 2018. The performance figures for Class I include the performance for the Class A for the periods prior to the start date of Class I. Class A imposes higher expenses than Class I.
[10] 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. 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.