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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2018
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 Feb. 28, 2020
Prospectus Date rr_ProspectusDate May 01, 2019
Aristotle Value Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION – Aristotle Value Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the Aristotle Value Equity Fund (the "Fund" or "Value Equity Fund") is to maximize 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 Value Equity Fund.
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 April 30, 2021
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Value Equity 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 Value Equity 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 Value Equity Fund's portfolio turnover rate was 18% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 18.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The expense information in the table has been restated to reflect the current expense cap, effective March 1, 2020.
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 Value Equity Fund with the cost of investing in other mutual funds.

 

The example assumes that you invest $10,000 in the Value Equity 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 Value Equity 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 Value Equity Fund invests at least 80% of its net assets (including amounts borrowed for investment purposes) in equity securities. The Value Equity Fund's investments in equity securities may include common stocks, depository receipts, and exchange-traded funds ("ETFs") that invest primarily in equity securities. Depository receipts represent interests in foreign securities held on deposit by banks. ETFs are investment companies that invest in portfolios of securities designed to track particular market segments or indices, the shares of which are bought and sold on securities exchanges.

 

The Value Equity Fund seeks to meet its investment objective by investing primarily in equity securities of domestic and foreign issuers that are listed on a U.S. exchange or that are otherwise publicly traded in the United States but may invest up to 20% of its total assets in American Depository Receipts and Global Depository Receipts ("ADRs" and "GDRs", respectively). ADRs are receipts that represent interests in foreign securities held on deposit by U.S. banks. GDRs have the same qualities as ADRs, except that they may be traded in several international trading markets.

 

In selecting investments for the Value Equity Fund, the Advisor employs a fundamental, bottom-up approach. The Advisor focuses on those companies that it believes have high quality businesses that are undervalued by the market relative to what the Advisor believes to be their fair value and have a minimum market capitalization of $2 billion. The Advisor seeks to identify high quality businesses by focusing on companies with the following attributes: attractive business fundamentals; experienced, motivated company management; pricing power; sustainable competitive advantages; financial strength; and/or high or consistently improving market position, return on invested capital and operating margins.

 

The Value Equity Fund generally seeks favorable performance relative to its benchmark, the Russell 1000 Value Index. However, the Advisor is not constrained by the composition of the Russell 1000 Value Index in selecting investments for the Fund.
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

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

 

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 Fund's 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.

 

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

 

ETF Risk. Investing in an ETF will provide the Value Equity Fund with exposure to the securities comprising the index on which the ETF is based and will expose the Value Equity 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.

 

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 ADRs and Global Depository Receipts ("GDRs") Unsponsored ADRs 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. Emerging markets tend to be more volatile than the markets of more mature economies and generally have less diverse and less mature economic structures and less stable political systems than those of developed countries.

 

Large-Cap Company Risk. Larger, more established companies may be unable to attain the high growth rates of successful, smaller companies during periods of economic expansion.

 

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.

 

Sector Focus Risk. The Fund may invest a larger portion of its assets in one or more sectors than many other mutual funds, and thus will be more susceptible to negative events affecting those sectors. For example, as of December 31, 2018, 25.2% of the Value Equity Fund's assets were invested in the financial sector. Performance of companies in the financial sector may be adversely impacted by many factors, including, among others: government regulations of, or related to, the sector; governmental monetary and fiscal policies; economic, business or political conditions; credit rating downgrades; changes in interest rates; price competition; and decreased liquidity in credit markets. This sector has experienced significant losses and a high degree of volatility in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted.

 

Small-Cap and Mid-Cap Company Risk. 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.

 

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.
Risk Lose Money [Text] rr_RiskLoseMoney Before you decide whether to invest in the Value Equity Fund, carefully consider these risk factors associated with investing in the Value Equity 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 Value Equity Fund by showing changes in the Fund's performance from year to year and by showing how the average annual total returns of the Fund compare with the average annual total returns of a broad-based market index. Updated performance information is available at the Value Equity Fund's website, www.aristotlefunds.com, or by calling the Fund at 1-888-661-6691. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
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 Value Equity Fund by showing changes in the Fund's performance from year to year and by showing how the average annual total returns of the Fund compare with the average annual total returns of a broad-based market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-661-6691
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.aristotlefunds.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 each calendar year at NAV
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest Calendar Quarter Return at NAV  6.70% Quarter Ended 03/31/2017
Lowest Calendar Quarter Return at NAV  (12.78)% Quarter Ended 12/31/2018

 

The year-to-date return for the Fund as of March 31, 2019 was 11.96%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for periods ended December 31, 2018
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.
Aristotle Value Equity Fund | Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol ARSQX
Maximum sales charge (load) imposed on purchases 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 (1.00%)
Wire fee imst_WireFee $ 20
Overnight check delivery fee imst_OvernightCheckDeliveryFee 25
Retirement account fees (annual maintenance fee) rr_ShareholderFeeOther $ 15
Management fees rr_ManagementFeesOverAssets 0.60% [1]
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other expenses rr_OtherExpensesOverAssets 0.36% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.96% [1]
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.27%) [1],[2]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 0.69% [1],[2]
One Year rr_ExpenseExampleYear01 $ 70
Three Years rr_ExpenseExampleYear03 279
Five Years rr_ExpenseExampleYear05 505
Ten Years rr_ExpenseExampleYear10 $ 1,153
2017 rr_AnnualReturn2017 22.12%
2018 rr_AnnualReturn2018 (9.53%)
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 11.96%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Calendar Quarter Return at NAV
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.70%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Calendar Quarter Return at NAV
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.78%)
1 Year rr_AverageAnnualReturnYear01 (9.53%)
Since Inception rr_AverageAnnualReturnSinceInception 6.47%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2016
Aristotle Value Equity Fund | After Taxes on Distributions | Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (9.83%) [3]
Since Inception rr_AverageAnnualReturnSinceInception 6.19% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2016 [3]
Aristotle Value Equity Fund | After Taxes on Distributions and Sales | Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (5.46%) [3]
Since Inception rr_AverageAnnualReturnSinceInception 4.97% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2016 [3]
Aristotle Value Equity Fund | Russell 1000 Value Index (Reflects no deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (8.27%)
Since Inception rr_AverageAnnualReturnSinceInception 4.57%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2016
Aristotle Value Equity Fund | S&P 500 Index (Reflects no deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (4.38%)
Since Inception rr_AverageAnnualReturnSinceInception 8.50%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2016
[1] The expense information in the table has been restated to reflect the current expense cap, effective March 1, 2020.
[2] The Value Equity 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 Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 0.69% of the average daily net assets of Class I Shares of the Value Equity Fund. This agreement is in effect until April 30, 2021, and it may be terminated before that date only by the Trust's Board of Trustees. The Value Equity Fund's Advisor is permitted to seek reimbursement from the Value Equity Fund, subject to certain limitations, of fees waived or payments made to the Value Equity 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.
[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.