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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Mar. 30, 2020
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
Trading Symbol dei_TradingSymbol imst
Document Creation Date dei_DocumentCreationDate Mar. 30, 2020
Document Effective Date dei_DocumentEffectiveDate Mar. 31, 2020
Prospectus Date rr_ProspectusDate Mar. 31, 2020
WCM Small Cap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION – WCM Small Cap Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the WCM Small Cap Growth Fund (the "Fund") is 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.
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 August 31, 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. The Fund is newly-created and, as a result, does not yet have a portfolio turnover rate.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other expenses" have been estimated for the current fiscal year. Actual expenses may differ from estimates.
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 circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of small capitalization companies. The Fund primarily invests in common stocks of U.S. companies and may include common stocks that are offered in initial public offerings ("IPOs"). The Fund may also invest in real estate investment trusts ("REITs"). The Fund's advisor considers small capitalization companies to be companies with market capitalizations within the range of those companies included in the Russell 2000® Index at the time of purchase. Because small capitalization companies are defined by reference to an index, the range of market capitalization of companies in which the Fund invests may vary with market conditions. As of November 30, 2019, the market capitalizations of companies included in the Russell 2000® Index were between $14.5 million and $9.05 billion. Investments in companies that move above or below the capitalization range of the Russell 2000® Index may continue to be held by the Fund in the Fund advisor's sole discretion.

 

The Fund's advisor uses a bottom-up approach that seeks to identify companies believed to have above-average potential for growth in the rate of return on invested capital and assets. The advisor's investment process seeks companies that are industry leaders with sustainable competitive advantages; corporate cultures emphasizing strong, quality and experienced management; little or no debt; attractive relative valuations; and potential for asset base growth. The Fund's advisor employs a dynamic process to analyze corporate performance and valuation, which includes evaluating the current trajectory and outlook for each company held by the Fund, as well as the value the market is assigning to the cash flow the company can generate. In selecting securities, the Fund's advisor also considers other factors including, among others, political risk, monetary policy risk, and regulatory risk.
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 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.

 

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. In addition, local regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, or other events could have a significant impact on a security or instrument. 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.

 

Small cap company risk. The securities of small 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.

 

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.

 

Market Turbulence Resulting from COVID-19. An outbreak of an infectious respiratory illness caused by a novel coronavirus known as COVID-19 has negatively affected the worldwide economy, as well as the economies of individual countries, the financial health of individual companies and the market in general in significant and unforeseen ways. The future impact of COVID-19 is currently unknown, and it may exacerbate other risks that apply to the Fund. Any such impact could adversely affect the Fund's performance, the performance of the securities in which the Fund invests and may lead to losses on your investment in the Fund.

 

IPO risk. The market value of IPO shares will fluctuate considerably due to factors such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited information about the issuer. The purchase of IPO shares may involve high transaction costs. IPO shares are subject to market risk and liquidity risk.

 

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, supply and demand, interest rates, zoning laws, regulatory limitations on rents, property taxes and operating expenses.

 

Growth-oriented investment strategies risk. Growth funds generally focus on stocks of companies believed to have above-average potential for growth in revenue and earnings. Growth securities typically are very sensitive to market movements because their market prices frequently reflect projections of future earnings or revenues, and when it appears that those expectations will not be met, the prices of growth securities typically fall.

 

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.

 

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.

 

No operating history. The Fund is newly organized and has no operating history. As a result, prospective investors have no track record or history on which to base their investment decisions.

 

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. Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value of those securities could decline if the issuers experience cybersecurity incidents.
Risk Lose Money [Text] rr_RiskLoseMoney Risk is inherent in all investing and you could lose money by investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The Fund is new and does not have a full calendar year performance record to compare against other mutual funds or broad measures of securities market performance such as indices. Performance information will be available after the Fund has been in operation for one calendar year.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Fund is new and does not have a full calendar year performance record to compare against other mutual funds or broad measures of securities market performance such as indices.
WCM Small Cap Growth Fund | Investor Class Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol WCMNX
Maximum sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
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 1.00%
Distribution (Rule 12b-1) fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder service fee rr_Component1OtherExpensesOverAssets 0.15%
All other expenses rr_Component2OtherExpensesOverAssets 0.49%
Other expenses rr_OtherExpensesOverAssets 0.64% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.89%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.39%) [2]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.50% [1],[2]
One Year rr_ExpenseExampleYear01 $ 153
Three Years rr_ExpenseExampleYear03 $ 556
WCM Small Cap Growth Fund | Institutional Class Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol WCMLX
Maximum sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
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 1.00%
Distribution (Rule 12b-1) fee rr_DistributionAndService12b1FeesOverAssets none
Shareholder service fee rr_Component1OtherExpensesOverAssets 0.15%
All other expenses rr_Component2OtherExpensesOverAssets 0.49%
Other expenses rr_OtherExpensesOverAssets 0.64% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.64%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.39%) [2]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.25% [1],[2]
One Year rr_ExpenseExampleYear01 $ 127
Three Years rr_ExpenseExampleYear03 $ 479
[1] "Other expenses" have been estimated for the current fiscal year. Actual expenses may differ from estimates.
[2] 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 the Fund's Investor Class and Institutional Class shares, respectively. This agreement is in effect until August 31, 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 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.