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Label Element Value
Risk Return Abstract rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate May 31, 2017
Registrant Name dei_EntityRegistrantName Investment Managers Series Trust
Central Index Key dei_EntityCentralIndexKey 0001318342
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Sep. 27, 2017
Document Effective Date dei_DocumentEffectiveDate Oct. 01, 2017
Prospectus Date rr_ProspectusDate Oct. 01, 2017
Bernzott U.S. Small Cap Value Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

SUMMARY SECTION
Objective [Heading] rr_ObjectiveHeading

Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the Bernzott U.S. Small Cap Value 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 September 30, 2018
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 38% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 38.00%
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.

 

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 (including amounts borrowed for investment purposes) in common stock of small capitalization companies that are organized in the United States and the securities of which are principally traded on a major U.S. exchange. The Fund's advisor focuses on companies that it believes to be undervalued and underappreciated by the general market. The Fund considers small capitalization companies to be those companies that, at the time of initial purchase, have a market capitalization no greater than that of the largest company in the Russell 2000 Value Index during the most recent 12-month period (approximately $4.8 billion during the 12-month period ended June 30, 2017). The Russell 2000 Value Index is reconstituted annually. 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. Investments in companies that move above or below the capitalization range may continue to be held by the Fund in the sole discretion of the Fund's advisor. The Fund will generally hold between 25 and 35 positions. In addition, the Fund may invest in exchange-traded funds ("ETFs"), which are pooled investment vehicles that generally seek to track the performance of specific indices and are traded on exchanges.
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.

 

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 Securities 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.

 

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. Therefore, the Fund is most suitable for long-term investors who are willing to hold their shares for extended periods of time through market fluctuations and the accompanying changes in share prices.

 

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.

 

Focused Investment Risk. Although the Fund is diversified, the Fund's advisor focuses its investments in the securities of a relatively small number of issuers. Many financial experts may take the position that investing a portfolio in a limited number of issuers results in greater market risk and potential losses than if the portfolio's assets were diversified among the securities of a greater number of issuers.

 

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 May 31, 2017, 26.9% of the Fund's assets were invested in the Industrials sector. Performance of companies in the Industrials sector may be affected by, among other things, supply and demand for their specific products or services, government regulation, technological developments and fuel prices.

 

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. Investment strategies employed by the Fund's advisor in selecting investments for the Fund may not result in an increase in the value of your investment or in overall performance equal to other investments. Due to the Fund's investment strategies, during periods of high market returns the Fund's investment returns may trail those of the Russell 2000 Value Index, the Fund's benchmark index.

 

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.
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 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 Fund's website, www.bcafunds.com, or by calling the Fund at 877-998-9880. 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 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 877-998-9880
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.bcafunds.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

The year-to-date return as of June 30, 2017, was 9.45%

 

Highest Calendar Quarter Return at NAV 10.60% Quarter Ended 12/31/2013
Lowest Calendar Quarter Return at NAV (11.77)% Quarter Ended 09/30/2015
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2017
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 9.45%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Calendar Quarter Return at NAV
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.60%
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 (11.77%)
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns

for Period Ended December 31, 2016
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.
Bernzott U.S. Small Cap Value Fund | Bernzott U.S. Small Cap Value Fund Shares  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol BSCVX
Maximum sales charge (load) imposed on purchases rr_MaximumCumulativeSalesChargeOverOfferingPrice 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 bernz_WireFee $ 20
Overnight check delivery fee bernz_OvernightCheckDeliveryFee 25
Retirement account fees (annual maintenance fee) rr_ShareholderFeeOther $ 15
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.42%
Total annual fund operating expenses rr_ExpensesOverAssets 1.22%
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (0.27%) [1]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 0.95% [1]
One Year rr_ExpenseExampleYear01 $ 97
Three Years rr_ExpenseExampleYear03 360
Five Years rr_ExpenseExampleYear05 644
Ten Years rr_ExpenseExampleYear10 $ 1,453
Annual Return 2013 rr_AnnualReturn2013 27.31%
Annual Return 2014 rr_AnnualReturn2014 5.26%
Annual Return 2015 rr_AnnualReturn2015 (8.67%)
Annual Return 2016 rr_AnnualReturn2016 16.05%
1 Year rr_AverageAnnualReturnYear01 16.05%
Since Inception rr_AverageAnnualReturnSinceInception 10.57%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2012
Bernzott U.S. Small Cap Value Fund | After Taxes on Distributions | Bernzott U.S. Small Cap Value Fund Shares  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.69% [2]
Since Inception rr_AverageAnnualReturnSinceInception 9.18% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2012 [2]
Bernzott U.S. Small Cap Value Fund | After Taxes on Distributions and Sales | Bernzott U.S. Small Cap Value Fund Shares  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.37% [2]
Since Inception rr_AverageAnnualReturnSinceInception 8.01% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2012 [2]
Bernzott U.S. Small Cap Value Fund | Russell 2000 Value Index  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 31.74%
Since Inception rr_AverageAnnualReturnSinceInception 14.01%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2012
[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, 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 0.95% of the average daily net assets of the Fund. This agreement is in effect until September 30, 2018, 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 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 reimbursement.
[2] 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.