485BPOS

AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 12, 2018

REGISTRATION NOS. 333 -122901

811 -21719

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	[   ]
PRE-EFFECTIVE AMENDMENT NO.	[   ]
POST-EFFECTIVE AMENDMENT NO. 966	[X]
AND/OR
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	[   ]
AMENDMENT NO. 979	[X]

INVESTMENT MANAGERS SERIES TRUST

(Exact Name of Registrant as Specified in Charter)

235 W. Galena Street

Milwaukee, WI 53212

(Address of Principal Executive Offices, including Zip Code)

Registrant's Telephone Number, Including Area Code: (414) 299-2295

Constance Dye Shannon

UMB Fund Services, Inc.

235 W. Galena Street

Milwaukee, WI 53212

(Name and Address of Agent for Service)

COPIES TO:

Laurie Anne Dee

Morgan, Lewis & Bockius LLP

600 Anton Boulevard, Suite 1800

Costa Mesa, CA 92626

It is proposed that this filing will become effective (check appropriate box):

[X]	immediately upon filing pursuant to paragraph (b) of Rule 485; or
[  ]	on ___________, pursuant to paragraph (b) of Rule 485; or
[  ]	60 days after filing pursuant to paragraph (a)(1) of Rule 485;
[  ]	on ___________ pursuant to paragraph (a)(1) of Rule 485; or
[  ]	75 days after filing pursuant to paragraph (a)(2) of Rule 485; or
[  ]	on ___________ pursuant to paragraph (a)(2) of Rule 485; or
[  ]	on ___________ pursuant to paragraph (a)(3) of Rule 485.

If appropriate, check the following box:

[  ] This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Milwaukee and State of Wisconsin, on the 12th day of September, 2018.

INVESTMENT MANAGERS SERIES TRUST
By:	/s/ Maureen Quill
	Maureen Quill, President

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed on the 12th day of September, 2018, by the following persons in the capacities set forth below.

Signature		Title
†
Ashley Toomey Rabun		Trustee
†
William H. Young		Trustee
†
Charles H. Miller		Trustee
†
John P. Zader		Trustee
†
Eric M. Banhaxl /s/ Maureen Quill		Trustee
Maureen Quill /s/ Rita Dam		President
Rita Dam		Treasurer
† By	/s/ Rita Dam
Attorney-in-fact, pursuant to power of attorney previously filed with Post-Effective Amendment No. 558 on September 30, 2014.

EXHIBIT INDEX

Exhibit	Exhibit No.
XBRL Instance Document	EX-101.INS
XBRL Taxonomy Extension Schema Document	EX-101.SCH
XBRL Taxonomy Extension Calculation Linkbase	EX-101.CAL
XBRL Taxonomy Extension Definition Linkbase	EX-101.DEF
XBRL Taxonomy Extension Labels Linkbase	EX-101.LAB
XBRL Taxonomy Extension Presentation Linkbase	EX-101.PRE

XML

Document and Entity Information	Total
Document And Entity Information
Document Type	485BPOS
Document Period End Date	Apr. 30, 2018
Registrant Name	Investment Managers Series Trust
Central Index Key	0001318342
Amendment Flag	false
Document Creation Date	Aug. 28, 2018
Document Effective Date	Sep. 01, 2018
Prospectus Date	Sep. 01, 2018

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WCM Focused International Growth Fund

SUMMARY SECTION - WCM Focused International Growth Fund

Investment Objective

The investment objective of the WCM Focused International Growth Fund (the "Fund") is long-term capital appreciation.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - WCM Focused International Growth Fund - USD ($)	Investor Class Shares	Institutional Class Shares
Maximum sales charge (load) imposed on purchases	none	none
Maximum deferred sales charge (load)	none	none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed)	1.00%	1.00%
Wire fee	$ 20	$ 20
Overnight check delivery fee	25	25
Retirement account fees (annual maintenance fee)	$ 15	$ 15

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - WCM Focused International Growth Fund		Investor Class Shares	Institutional Class Shares
Management fees		0.85%	0.85%
Distribution (Rule 12b-1) fee		0.25%	none
Shareholder service fee		0.08%	0.08%
All other expenses		0.12%	0.12%
Other expenses		0.20%	0.20%
Acquired fund fees and expenses		0.01%	0.01%
Total annual fund operating expenses	[1]	1.31%	1.06%

Example

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:

Expense Example - WCM Focused International Growth Fund - USD ($)	One Year	Three Years	Five Years	Ten Years
Investor Class Shares	133	415	718	1,579
Institutional Class Shares	108	337	585	1,294

Portfolio Turnover

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.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 75% of its net assets in equity securities of non-U.S. domiciled companies or depository receipts of non-U.S. domiciled companies located in developed countries and in emerging and frontier market countries. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market.

The Fund's investments in equity securities may include common stocks and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively). ADRs are receipts that represent interests in foreign securities held on deposit by U.S. banks. EDRs and GDRs have the same qualities as ADRs, except that they may be traded in several international trading markets.

The Fund's advisor uses a bottom-up approach that seeks to identify companies with attractive fundamentals, such as long-term growth in revenue and earnings, and that show a strong probability for superior future growth. The advisor's investment process focuses on seeking companies that are industry leaders with strengthening competitive advantages; corporate cultures emphasizing strong, quality and experienced management; low or no debt; and attractive relative valuations. The Fund's advisor also considers other factors including political risk, monetary policy risk, and regulatory risk in selecting securities.

Although the Fund may invest in any size companies, it generally invests in large capitalization established multinational companies. The Fund's advisor considers large capitalization companies to be those with market capitalization of $5 billion or greater at the time of investment. The Fund generally invests in securities of companies located in different regions and in at least three different countries. However, from time to time, the Fund may have a significant portion of its assets invested in the securities of companies in one or a few countries or regions. The Fund may make significant investments in certain sectors or group of sectors within a particular industry or industries from time to time.

Principal Risks of Investing

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.

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.

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 ADRs, EDRs, CDRs and 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market countries.

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.

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.

Performance

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 Institutional Class 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.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

The year-to-date return as of June 30, 2018 was 2.67%.

Institutional Shares
Highest Calendar Quarter Return at NAV	11.09%	Quarter Ended 03/31/2012
Lowest Calendar Quarter Return at NAV	(7.82)%	Quarter Ended 06/30/2012

Average Annual Total Returns
(for the periods ended December 31, 2017)

Average Annual Total Returns - WCM Focused International Growth Fund		1 Year	5 Years	Since Inception	Inception Date
Investor Class Shares		30.89%	10.89%	7.83%	Aug. 31, 2011	[1]
Institutional Class Shares		31.24%	11.14%	8.09%	May 31, 2011
Institutional Class Shares | Return After Taxes on Distributions	[2]	31.18%	10.95%	7.94%	May 31, 2011
Institutional Class Shares | Return After Taxes on Distributions and Sale of Fund Shares	[2]	17.89%	8.91%	6.49%	May 31, 2011
MSCI ACWI ex US Index (reflects no deduction for fees, expenses or taxes)		27.19%	6.80%	4.43%	May 31, 2011

[1] The total annual fund operating expenses and net operating expenses after fee waiver and/or expense reimbursements do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[1] Institutional Class started on May 31, 2011. Investor Class started on August 31, 2011. The performance figures for Investor Class include the performance for Institutional Class for the periods prior to the start date of Investor Class, adjusted for the difference in Investor Class and Institutional Class expenses. Investor Class imposes higher expenses than Institutional Class.

[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. After-tax returns are shown for Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.

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WCM Focused Emerging Markets Fund

SUMMARY SECTION - WCM Focused Emerging Markets Fund

Investment Objective

The investment objective of the WCM Focused Emerging Markets Fund (the "Fund") is long-term capital appreciation.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - WCM Focused Emerging Markets Fund - USD ($)	Investor Class Shares	Institutional Class Shares
Maximum sales charge (load) imposed on purchases	none	none
Maximum deferred sales charge (load)	none	none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed)	1.00%	1.00%
Wire fee	$ 20	$ 20
Overnight check delivery fee	25	25
Retirement account fees (annual maintenance fee)	$ 15	$ 15

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - WCM Focused Emerging Markets Fund		Investor Class Shares	Institutional Class Shares
Management fees		1.00%	1.00%
Distribution (Rule 12b-1) fee		0.25%	none
Shareholder service fee		0.04%	0.04%
All other expenses		0.97%	0.97%
Other expenses		1.01%	1.01%
Acquired fund fees and expenses		0.01%	0.01%
Total annual fund operating expenses	[1]	2.27%	2.02%
Fees waived and/or expenses reimbursed	[2]	(0.61%)	(0.61%)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	[1],[2]	1.66%	1.41%

Example

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:

Expense Example - WCM Focused Emerging Markets Fund - USD ($)	One Year	Three Years	Five Years	Ten Years
Investor Class Shares	169	523	902	1,965
Institutional Class Shares	144	446	771	1,691

Portfolio Turnover

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 47% of the average value of its portfolio.

Principal Investment Strategies

Under normal market conditions, the Fund invests at least 80% of its net assets (including amounts borrowed for investment purposes) in equity securities of companies in emerging or frontier countries or markets. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market.

The Fund's advisor expects the Fund to primarily invest in equity securities under normal circumstances. The Fund's equity investments include common stock and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively).

The Fund's advisor uses a bottom-up approach that seeks to identify companies with attractive fundamentals, such as long-term historical growth in revenue and earnings, and/or a strong probability for superior future growth. The advisor's investment process seeks companies that are industry leaders with strengthening competitive advantages; corporate cultures emphasizing strong, quality and experienced management; low or no debt; and attractive relative valuations. The Fund's advisor also considers other factors including political risk, monetary policy risk, and regulatory risk in selecting securities.

The Fund may invest in securities of any size companies. The Fund generally invests in the securities of companies domiciled in at least three different countries. However, from time to time, the Fund may have a significant portion of its assets invested in the securities of companies domiciled in one or a few countries or regions. The Fund may make significant investments in certain sectors or group of sectors within a particular industry or industries from time to time.

Principal Risks of Investing

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.

Currency Risk. The value of investments in securities denominated in foreign currencies increases or decreases 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 less 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.

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 ADRs, EDRs, CDRs and 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market 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.

Small-Cap and Mid-Cap Company Risk. The securities of small-capitalization or 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.

Performance

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 Institutional Class 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.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

The year-to-date return as of June 30, 2018 was (0.08)%.

Institutional Shares
Highest Calendar Quarter Return at NAV	11.95%	Quarter Ended 06/30/2017
Lowest Calendar Quarter Return at NAV	(15.59)%	Quarter Ended 09/30/2015

Average Annual Total Returns
(for the periods ended December 31, 2017)

Average Annual Total Returns - WCM Focused Emerging Markets Fund		1 Year	Since Inception	Inception Date
Investor Class Shares		40.93%	5.10%	Jun. 28, 2013
Institutional Class Shares		40.90%	5.21%	Jun. 28, 2013
Institutional Class Shares | Return After Taxes on Distributions	[1]	40.68%	5.11%	Jun. 28, 2013
Institutional Class Shares | Return After Taxes on Distributions and Sale of Fund Shares	[1]	23.39%	4.04%	Jun. 28, 2013
MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)		37.28%	7.20%	Jun. 28, 2013

[1] The "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[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 Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.65% and 1.40% of the average daily net assets of the Fund's Investor Class and Institutional Class shares of the Fund, respectively. This agreement is in effect until August 31, 2028, 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.

[1] 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 Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.

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WCM Focused Global Growth Fund

SUMMARY SECTION - WCM Focused Global Growth Fund

Investment Objective

The investment objective of the WCM Focused Global Growth Fund (the "Fund") is long-term capital appreciation.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - WCM Focused Global Growth Fund - USD ($)	Investor Class Shares	Institutional Class Shares
Maximum sales charge (load) imposed on purchases	none	none
Maximum deferred sales charge (load)	none	none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed)	1.00%	1.00%
Wire fee	$ 20	$ 20
Overnight check delivery fee	25	25
Retirement account fees (annual maintenance fee)	$ 15	$ 15

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - WCM Focused Global Growth Fund		Investor Class Shares	Institutional Class Shares
Management fees		0.85%	0.85%
Distribution (Rule 12b-1) fee		0.25%	none
Shareholder service fee		0.08%	0.08%
All other expenses		1.11%	1.11%
Other expenses		1.19%	1.19%
Acquired fund fees and expenses		0.01%	0.01%
Total annual fund operating expenses	[1]	2.30%	2.05%
Fees waived and/or expenses reimbursed	[2]	(0.89%)	(0.89%)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	[1],[2]	1.41%	1.16%

Example

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:

Expense Example - WCM Focused Global Growth Fund - USD ($)	One Year	Three Years	Five Years	Ten Years
Investor Class Shares	144	446	771	1,691
Institutional Class Shares	118	368	638	1,409

Portfolio Turnover

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.

Principal Investment Strategies

The Fund invests primarily in equity securities of companies located throughout the world, including the United States. Under normal market conditions, the Fund invests at least 40% of its net assets in companies organized, headquartered or doing a substantial amount of business outside the United States including emerging and frontier market countries. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market. The Fund's advisor considers a company that has at least 50% of its assets, or derives at least 50% of its revenues from business, outside the United States as doing a substantial amount of business outside the United States.

The Fund's equity investments include common stock and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively).

The Fund's advisor uses a bottom-up approach that seeks to identify companies with attractive fundamentals, such as long-term historical growth in revenue and earnings, and/or a strong probability for superior future growth. The advisor's investment process seeks companies that are industry leaders with strengthening competitive advantages; corporate cultures emphasizing strong, quality and experienced management; low or no debt; and attractive relative valuations. The Fund's advisor also considers other factors including political risk, monetary policy risk, and regulatory risk in selecting securities.

Although the Fund may invest in securities of any size companies, it generally invests in the securities of large, established multinational companies. The Fund generally invests in securities of companies located in different regions and in at least three different countries. However, from time to time, the Fund may have a significant portion of its assets invested in the securities of companies in one or a few countries or regions. The Fund may make significant investments in certain sectors or group of sectors within a particular industry or industries from time to time.

Principal Risks of Investing

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.

Currency Risk. The value 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.

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 environment of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the value 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, EDRs, CDRs and 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market countries.

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.

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.

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.

Performance

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 Institutional Class 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.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

The year-to-date return as of June 30, 2018 was 4.26%.

Institutional Shares
Highest Calendar Quarter Return at NAV	8.03%	Quarter Ended 12/31/2017
Lowest Calendar Quarter Return at NAV	(5.52)%	Quarter Ended 12/31/2016

Average Annual Total Returns
(for the periods ended December 31, 2017)

Average Annual Total Returns - WCM Focused Global Growth Fund		1 Year	Since Inception	Inception Date
Investor Class Shares		27.30%	12.64%	Jun. 28, 2013
Institutional Class Shares		27.52%	12.83%	Jun. 28, 2013
Institutional Class Shares | Return After Taxes on Distributions	[1]	27.06%	11.65%	Jun. 28, 2013
Institutional Class Shares | Return After Taxes on Distributions and Sale of Fund Shares	[1]	15.92%	9.77%	Jun. 28, 2013
MSCI ACWI Index (reflects no deduction for fees, expenses or taxes)		23.97%	10.59%	Jun. 28, 2013

[1] The "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[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 Form N-1A, expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.40% and 1.15% 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, 2028 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.

[1] 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 Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.

XML

WCM International Small Cap Growth Fund

SUMMARY SECTION – WCM International Small Cap Growth Fund

Investment Objective

The investment objective of the WCM International Small Cap Growth Fund (the "Fund") is long-term capital appreciation.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees	WCM International Small Cap Growth Fund Institutional Class Shares USD ($)
Maximum sales charge (load) imposed on purchases	none
Maximum deferred sales charge (load)	none
Redemption fee if redeemed within 30 days of purchase (as a percentage of amount redeemed)	1.00%
Wire fee	$ 20
Overnight check delivery fee	25
Retirement account fees (annual maintenance fee)	$ 15

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	WCM International Small Cap Growth Fund Institutional Class Shares
Management fees	1.00%
Distribution (Rule 12b-1) fee	none
Shareholder service fee	0.07%
All other expenses	10.28%
Other expenses	10.35%
Acquired fund fees and expenses	0.01%
Total annual fund operating expenses	11.36%	[1]
Fees waived and/or expenses reimbursed	(9.95%)	[2]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	1.41%	[1],[2]

Example

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:

Expense Example	One Year	Three Years	Five Years	Ten Years
WCM International Small Cap Growth Fund | Institutional Class Shares | USD ($)	144	446	771	1,691

Portfolio Turnover

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 58% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund will invest at least 80% of its net assets in equity securities or depository receipts of small capitalization companies domiciled outside of the United States, including in emerging and frontier market countries. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market. The Fund's advisor considers a company to be domiciled in a country if the company is organized under the laws of that country or has its principal place of business in that country. The Fund's advisor considers small capitalization companies to be companies with market capitalizations within the range of those companies included in the MSCI ACWI Ex-US Small Cap 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 June 30, 2018, the market capitalizations of companies included in the MSCI ACWI Ex-US Small Cap Index were between $27.7 million and $8.5 billion. The Fund's advisor will consider the market capitalization range by country. Investments in companies that move above or below the capitalization range of the MSCI ACWI Ex-US Small Cap Index may continue to be held by the Fund in the Fund advisor's sole discretion.

The Fund's equity investments include common stock and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively). ADRs are receipts that represent interests in foreign securities held on deposit by U.S. banks. EDRs and GDRs have the same qualities as ADRs, except that they may be traded in several international trading markets.

The Fund generally will invest in the securities of companies domiciled in at least three different countries. However, from time to time, the Fund may invest a significant portion of its assets in the securities of companies domiciled in one or a few countries. The Fund may make significant investments in certain sectors or group of sectors from time to time.

The Fund's advisor uses a bottom-up approach that seeks to identify companies believed to have above-average potential for growth in revenue and earnings. 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; and attractive relative valuations. In selecting securities, the Fund's advisor also considers other factors including, among others, political risk, monetary policy risk, and regulatory risk specific to an issuer's country of domicile.

Principal Risks of Investing

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.

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 less 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.

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 ADRs, EDRs, CDRs and GDRs. Unsponsored depository receipts 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market countries.

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.

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.

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.

Performance

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 Institutional Class Shares and by showing how the average annual total returns of the Fund compare with the average annual total returns of broad-based market indexes. Updated performance information is available at the Fund's website www.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

The year-to-date return as of June 30, 2018 was 12.95%.

Institutional Shares
Highest Calendar Quarter Return at NAV	12.82%	Quarter Ended 06/30/2017
Lowest Calendar Quarter Return at NAV	(9.47)%	Quarter Ended 12/31/2016

Average Annual Total Returns
(for the periods ended December 31, 2017)

Average Annual Total Returns - WCM International Small Cap Growth Fund		1 Year	Since Inception	Inception Date
Institutional Class Shares		42.35%	19.01%	Nov. 30, 2015
Institutional Class Shares | Return After Taxes on Distributions	[1]	41.96%	18.78%	Nov. 30, 2015
Institutional Class Shares | Return After Taxes on Distributions and Sale of Fund Shares	[1]	24.26%	14.76%	Nov. 30, 2015
MSCI ACWI ex USA Small Cap Index (reflects no deduction for fees, expenses or taxes)		31.65%	16.27%	Nov. 30, 2015

[1] The "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[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 1.40% of the average daily net assets of the Institutional Class Shares of the Fund. This agreement is in effect until August 31, 2028 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.

[1] 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.

XML

Label

Element

Value

Risk Return Abstract

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Apr. 30, 2018

Registrant Name

dei_EntityRegistrantName

Investment Managers Series Trust

Central Index Key

dei_EntityCentralIndexKey

0001318342

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Aug. 28, 2018

Document Effective Date

dei_DocumentEffectiveDate

Sep. 01, 2018

Prospectus Date

rr_ProspectusDate

Sep. 01, 2018

WCM Focused International Growth Fund

Risk Return Abstract

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY SECTION - WCM Focused International Growth Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The investment objective of the WCM Focused International 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)

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%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The total annual fund operating expenses and net operating expenses after fee waiver and/or expense reimbursements do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. 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 invests at least 75% of its net assets in equity securities of non-U.S. domiciled companies or depository receipts of non-U.S. domiciled companies located in developed countries and in emerging and frontier market countries. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market.

The Fund's investments in equity securities may include common stocks and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively). ADRs are receipts that represent interests in foreign securities held on deposit by U.S. banks. EDRs and GDRs have the same qualities as ADRs, except that they may be traded in several international trading markets.

The Fund's advisor uses a bottom-up approach that seeks to identify companies with attractive fundamentals, such as long-term growth in revenue and earnings, and that show a strong probability for superior future growth. The advisor's investment process focuses on seeking companies that are industry leaders with strengthening competitive advantages; corporate cultures emphasizing strong, quality and experienced management; low or no debt; and attractive relative valuations. The Fund's advisor also considers other factors including political risk, monetary policy risk, and regulatory risk in selecting securities.

Although the Fund may invest in any size companies, it generally invests in large capitalization established multinational companies. The Fund's advisor considers large capitalization companies to be those with market capitalization of $5 billion or greater at the time of investment. The Fund generally invests in securities of companies located in different regions and in at least three different countries. However, from time to time, the Fund may have a significant portion of its assets invested in the securities of companies in one or a few countries or regions. The Fund may make significant investments in certain sectors or group of sectors within a particular industry or industries from time to time.

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.

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.

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 ADRs, EDRs, CDRs and 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market countries.

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.

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.

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 Institutional Class 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.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. 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 for Institutional Class 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

1-888-988-9801

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.wcminvestfunds.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

Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

The year-to-date return as of June 30, 2018 was 2.67%.

Institutional Shares
Highest Calendar Quarter Return at NAV	11.09%	Quarter Ended 03/31/2012
Lowest Calendar Quarter Return at NAV	(7.82)%	Quarter Ended 06/30/2012

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
(for the periods ended December 31, 2017)

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 Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.

WCM Focused International Growth Fund | Investor Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

WCMRX

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%)

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Wire fee

imst_WireFee

20

Overnight check delivery fee

imst_OvernightCheckDeliveryFee

$ 25

Management fees

rr_ManagementFeesOverAssets

0.85%

Distribution (Rule 12b-1) fee

rr_DistributionAndService12b1FeesOverAssets

0.25%

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.08%

All other expenses

rr_Component2OtherExpensesOverAssets

0.12%

Other expenses

rr_OtherExpensesOverAssets

0.20%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.31%

^[1]

One Year

rr_ExpenseExampleYear01

$ 133

Three Years

rr_ExpenseExampleYear03

415

Five Years

rr_ExpenseExampleYear05

718

Ten Years

rr_ExpenseExampleYear10

$ 1,579

1 Year

rr_AverageAnnualReturnYear01

30.89%

5 Years

rr_AverageAnnualReturnYear05

10.89%

Since Inception

rr_AverageAnnualReturnSinceInception

7.83%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2011

^[2]

WCM Focused International Growth Fund | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

WCMIX

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%)

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Wire fee

imst_WireFee

20

Overnight check delivery fee

imst_OvernightCheckDeliveryFee

$ 25

Management fees

rr_ManagementFeesOverAssets

0.85%

Distribution (Rule 12b-1) fee

rr_DistributionAndService12b1FeesOverAssets

none

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.08%

All other expenses

rr_Component2OtherExpensesOverAssets

0.12%

Other expenses

rr_OtherExpensesOverAssets

0.20%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.06%

^[1]

One Year

rr_ExpenseExampleYear01

$ 108

Three Years

rr_ExpenseExampleYear03

337

Five Years

rr_ExpenseExampleYear05

585

Ten Years

rr_ExpenseExampleYear10

$ 1,294

Annual Return 2012

rr_AnnualReturn2012

12.47%

Annual Return 2013

rr_AnnualReturn2013

21.72%

Annual Return 2014

rr_AnnualReturn2014

(0.30%)

Annual Return 2015

rr_AnnualReturn2015

5.79%

Annual Return 2016

rr_AnnualReturn2016

0.67%

Annual Return 2017

rr_AnnualReturn2017

31.24%

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

2.67%

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

11.09%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Calendar Quarter Return at NAV

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2012

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(7.82%)

1 Year

rr_AverageAnnualReturnYear01

31.24%

5 Years

rr_AverageAnnualReturnYear05

11.14%

Since Inception

rr_AverageAnnualReturnSinceInception

8.09%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2011

WCM Focused International Growth Fund | Return After Taxes on Distributions | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

31.18%

^[3]

5 Years

rr_AverageAnnualReturnYear05

10.95%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

7.94%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2011

^[3]

WCM Focused International Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.89%

^[3]

5 Years

rr_AverageAnnualReturnYear05

8.91%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

6.49%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2011

^[3]

WCM Focused International Growth Fund | MSCI ACWI ex US Index (reflects no deduction for fees, expenses or taxes)

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

27.19%

5 Years

rr_AverageAnnualReturnYear05

6.80%

Since Inception

rr_AverageAnnualReturnSinceInception

4.43%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2011

WCM Focused Emerging Markets Fund

Risk Return Abstract

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY SECTION - WCM Focused Emerging Markets Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The investment objective of the WCM Focused Emerging Markets 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, 2028

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 47% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

47.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. 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 market conditions, the Fund invests at least 80% of its net assets (including amounts borrowed for investment purposes) in equity securities of companies in emerging or frontier countries or markets. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market.

The Fund's advisor expects the Fund to primarily invest in equity securities under normal circumstances. The Fund's equity investments include common stock and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively).

The Fund's advisor uses a bottom-up approach that seeks to identify companies with attractive fundamentals, such as long-term historical growth in revenue and earnings, and/or a strong probability for superior future growth. The advisor's investment process seeks companies that are industry leaders with strengthening competitive advantages; corporate cultures emphasizing strong, quality and experienced management; low or no debt; and attractive relative valuations. The Fund's advisor also considers other factors including political risk, monetary policy risk, and regulatory risk in selecting securities.

The Fund may invest in securities of any size companies. The Fund generally invests in the securities of companies domiciled in at least three different countries. However, from time to time, the Fund may have a significant portion of its assets invested in the securities of companies domiciled in one or a few countries or regions. The Fund may make significant investments in certain sectors or group of sectors within a particular industry or industries from time to time.

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.

Currency Risk. The value of investments in securities denominated in foreign currencies increases or decreases 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 less 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.

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 ADRs, EDRs, CDRs and 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market 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.

Small-Cap and Mid-Cap Company Risk. The securities of small-capitalization or 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.

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 Institutional Class 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.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. 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 for Institutional Class 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

1-888-988-9801

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.wcminvestfunds.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

Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

The year-to-date return as of June 30, 2018 was (0.08)%.

Institutional Shares
Highest Calendar Quarter Return at NAV	11.95%	Quarter Ended 06/30/2017
Lowest Calendar Quarter Return at NAV	(15.59)%	Quarter Ended 09/30/2015

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
(for the periods ended December 31, 2017)

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 Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.

WCM Focused Emerging Markets Fund | Investor Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

WFEMX

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%)

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Wire fee

imst_WireFee

20

Overnight check delivery fee

imst_OvernightCheckDeliveryFee

$ 25

Management fees

rr_ManagementFeesOverAssets

1.00%

Distribution (Rule 12b-1) fee

rr_DistributionAndService12b1FeesOverAssets

0.25%

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.04%

All other expenses

rr_Component2OtherExpensesOverAssets

0.97%

Other expenses

rr_OtherExpensesOverAssets

1.01%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.27%

^[4]

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.61%)

^[5]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.66%

^[4],[5]

One Year

rr_ExpenseExampleYear01

$ 169

Three Years

rr_ExpenseExampleYear03

523

Five Years

rr_ExpenseExampleYear05

902

Ten Years

rr_ExpenseExampleYear10

$ 1,965

1 Year

rr_AverageAnnualReturnYear01

40.93%

Since Inception

rr_AverageAnnualReturnSinceInception

5.10%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

WCM Focused Emerging Markets Fund | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

WCMEX

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%)

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Wire fee

imst_WireFee

20

Overnight check delivery fee

imst_OvernightCheckDeliveryFee

$ 25

Management fees

rr_ManagementFeesOverAssets

1.00%

Distribution (Rule 12b-1) fee

rr_DistributionAndService12b1FeesOverAssets

none

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.04%

All other expenses

rr_Component2OtherExpensesOverAssets

0.97%

Other expenses

rr_OtherExpensesOverAssets

1.01%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.02%

^[4]

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.61%)

^[5]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.41%

^[4],[5]

One Year

rr_ExpenseExampleYear01

$ 144

Three Years

rr_ExpenseExampleYear03

446

Five Years

rr_ExpenseExampleYear05

771

Ten Years

rr_ExpenseExampleYear10

$ 1,691

Annual Return 2014

rr_AnnualReturn2014

(7.50%)

Annual Return 2015

rr_AnnualReturn2015

(7.62%)

Annual Return 2016

rr_AnnualReturn2016

(0.83%)

Annual Return 2017

rr_AnnualReturn2017

40.09%

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.08%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Calendar Quarter Return at NAV

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2017

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.95%

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

(15.59%)

1 Year

rr_AverageAnnualReturnYear01

40.90%

Since Inception

rr_AverageAnnualReturnSinceInception

5.21%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

WCM Focused Emerging Markets Fund | Return After Taxes on Distributions | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

40.68%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

5.11%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

^[3]

WCM Focused Emerging Markets Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

23.39%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

4.04%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

^[3]

WCM Focused Emerging Markets Fund | MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

37.28%

Since Inception

rr_AverageAnnualReturnSinceInception

7.20%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

WCM Focused Global Growth Fund

Risk Return Abstract

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY SECTION - WCM Focused Global Growth Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The investment objective of the WCM Focused Global 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, 2028

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%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. 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

The Fund invests primarily in equity securities of companies located throughout the world, including the United States. Under normal market conditions, the Fund invests at least 40% of its net assets in companies organized, headquartered or doing a substantial amount of business outside the United States including emerging and frontier market countries. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market. The Fund's advisor considers a company that has at least 50% of its assets, or derives at least 50% of its revenues from business, outside the United States as doing a substantial amount of business outside the United States.

The Fund's equity investments include common stock and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively).

The Fund's advisor uses a bottom-up approach that seeks to identify companies with attractive fundamentals, such as long-term historical growth in revenue and earnings, and/or a strong probability for superior future growth. The advisor's investment process seeks companies that are industry leaders with strengthening competitive advantages; corporate cultures emphasizing strong, quality and experienced management; low or no debt; and attractive relative valuations. The Fund's advisor also considers other factors including political risk, monetary policy risk, and regulatory risk in selecting securities.

Although the Fund may invest in securities of any size companies, it generally invests in the securities of large, established multinational companies. The Fund generally invests in securities of companies located in different regions and in at least three different countries. However, from time to time, the Fund may have a significant portion of its assets invested in the securities of companies in one or a few countries or regions. The Fund may make significant investments in certain sectors or group of sectors within a particular industry or industries from time to time.

Risk [Heading]

rr_RiskHeading

Principal Risks of Investing

Risk Narrative [Text Block]

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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.

Currency Risk. The value 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.

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 environment of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the value 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, EDRs, CDRs and 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market countries.

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.

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.

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.

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]

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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 Institutional Class 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.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. 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 for Institutional Class 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

1-888-988-9801

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.wcminvestfunds.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]

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Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

Bar Chart Closing [Text Block]

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The year-to-date return as of June 30, 2018 was 4.26%.

Institutional Shares
Highest Calendar Quarter Return at NAV	8.03%	Quarter Ended 12/31/2017
Lowest Calendar Quarter Return at NAV	(5.52)%	Quarter Ended 12/31/2016

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
(for the periods ended December 31, 2017)

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 Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.

WCM Focused Global Growth Fund | Investor Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

WFGGX

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%)

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Wire fee

imst_WireFee

20

Overnight check delivery fee

imst_OvernightCheckDeliveryFee

$ 25

Management fees

rr_ManagementFeesOverAssets

0.85%

Distribution (Rule 12b-1) fee

rr_DistributionAndService12b1FeesOverAssets

0.25%

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.08%

All other expenses

rr_Component2OtherExpensesOverAssets

1.11%

Other expenses

rr_OtherExpensesOverAssets

1.19%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.30%

^[4]

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.89%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.41%

^[4],[6]

One Year

rr_ExpenseExampleYear01

$ 144

Three Years

rr_ExpenseExampleYear03

446

Five Years

rr_ExpenseExampleYear05

771

Ten Years

rr_ExpenseExampleYear10

$ 1,691

1 Year

rr_AverageAnnualReturnYear01

27.30%

Since Inception

rr_AverageAnnualReturnSinceInception

12.64%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

WCM Focused Global Growth Fund | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

WCMGX

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%)

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Wire fee

imst_WireFee

20

Overnight check delivery fee

imst_OvernightCheckDeliveryFee

$ 25

Management fees

rr_ManagementFeesOverAssets

0.85%

Distribution (Rule 12b-1) fee

rr_DistributionAndService12b1FeesOverAssets

none

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.08%

All other expenses

rr_Component2OtherExpensesOverAssets

1.11%

Other expenses

rr_OtherExpensesOverAssets

1.19%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.05%

^[4]

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.89%)

^[6]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.16%

^[4],[6]

One Year

rr_ExpenseExampleYear01

$ 118

Three Years

rr_ExpenseExampleYear03

368

Five Years

rr_ExpenseExampleYear05

638

Ten Years

rr_ExpenseExampleYear10

$ 1,409

Annual Return 2014

rr_AnnualReturn2014

(3.27%)

Annual Return 2015

rr_AnnualReturn2015

11.25%

Annual Return 2016

rr_AnnualReturn2016

3.79%

Annual Return 2017

rr_AnnualReturn2017

27.52%

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.26%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Calendar Quarter Return at NAV

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2017

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.03%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Calendar Quarter Return at NAV

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2016

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.52%)

1 Year

rr_AverageAnnualReturnYear01

27.52%

Since Inception

rr_AverageAnnualReturnSinceInception

12.83%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

WCM Focused Global Growth Fund | Return After Taxes on Distributions | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

27.06%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

11.65%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

^[3]

WCM Focused Global Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.92%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

9.77%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

^[3]

WCM Focused Global Growth Fund | MSCI ACWI Index (reflects no deduction for fees, expenses or taxes)

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

23.97%

Since Inception

rr_AverageAnnualReturnSinceInception

10.59%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 28, 2013

WCM International Small Cap Growth Fund

Risk Return Abstract

rr_RiskReturnAbstract

Risk/Return [Heading]

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SUMMARY SECTION – WCM International Small Cap Growth Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The investment objective of the WCM International 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, 2028

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 58% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

58.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. 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 in equity securities or depository receipts of small capitalization companies domiciled outside of the United States, including in emerging and frontier market countries. Emerging and frontier countries or markets are those countries or markets with low- to middle-income economies as classified by the World Bank or included in any of the Morgan Stanley Capital International (MSCI) emerging markets or frontier markets indices. The Fund's advisor considers a company to be in an emerging or frontier country or market if the company has been organized under the laws of, has its principal offices in, or has its securities principally traded in, the emerging or frontier country or market, or if the company derives at least 50% of its revenues, net profits or incremental revenue growth (typically over the past five years) from, or has at least 50% of assets or production capacities in, the emerging or frontier country or market. The Fund's advisor considers a company to be domiciled in a country if the company is organized under the laws of that country or has its principal place of business in that country. The Fund's advisor considers small capitalization companies to be companies with market capitalizations within the range of those companies included in the MSCI ACWI Ex-US Small Cap 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 June 30, 2018, the market capitalizations of companies included in the MSCI ACWI Ex-US Small Cap Index were between $27.7 million and $8.5 billion. The Fund's advisor will consider the market capitalization range by country. Investments in companies that move above or below the capitalization range of the MSCI ACWI Ex-US Small Cap Index may continue to be held by the Fund in the Fund advisor's sole discretion.

The Fund's equity investments include common stock and depository receipts. The Fund's investments in depository receipts may include American, European, Canadian and Global Depository Receipts ("ADRs", "EDRs", "CDRs" and "GDRs", respectively). ADRs are receipts that represent interests in foreign securities held on deposit by U.S. banks. EDRs and GDRs have the same qualities as ADRs, except that they may be traded in several international trading markets.

The Fund generally will invest in the securities of companies domiciled in at least three different countries. However, from time to time, the Fund may invest a significant portion of its assets in the securities of companies domiciled in one or a few countries. The Fund may make significant investments in certain sectors or group of sectors from time to time.

The Fund's advisor uses a bottom-up approach that seeks to identify companies believed to have above-average potential for growth in revenue and earnings. 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; and attractive relative valuations. In selecting securities, the Fund's advisor also considers other factors including, among others, political risk, monetary policy risk, and regulatory risk specific to an issuer's country of domicile.

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.

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 less 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.

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 ADRs, EDRs, CDRs and GDRs. Unsponsored depository receipts 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.

Frontier Market Risk. Frontier market countries generally have smaller economies and even less developed capital markets than traditional emerging markets, and as a result, the risks of investing in emerging market countries are magnified in frontier market countries.

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.

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.

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.

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 Institutional Class Shares and by showing how the average annual total returns of the Fund compare with the average annual total returns of broad-based market indexes. Updated performance information is available at the Fund's website www.wcminvestfunds.com, or by calling the Fund at 1-888-988-9801. 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 for Institutional Class Shares and by showing how the average annual total returns of the Fund compare with the average annual total returns of broad-based market indexes.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1-888-988-9801

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.wcminvestfunds.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

Annual Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

The year-to-date return as of June 30, 2018 was 12.95%.

Institutional Shares
Highest Calendar Quarter Return at NAV	12.82%	Quarter Ended 06/30/2017
Lowest Calendar Quarter Return at NAV	(9.47)%	Quarter Ended 12/31/2016

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
(for the periods ended December 31, 2017)

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.

WCM International Small Cap Growth Fund | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

WCMSX

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%)

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Wire fee

imst_WireFee

20

Overnight check delivery fee

imst_OvernightCheckDeliveryFee

$ 25

Management fees

rr_ManagementFeesOverAssets

1.00%

Distribution (Rule 12b-1) fee

rr_DistributionAndService12b1FeesOverAssets

none

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.07%

All other expenses

rr_Component2OtherExpensesOverAssets

10.28%

Other expenses

rr_OtherExpensesOverAssets

10.35%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

11.36%

^[4]

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(9.95%)

^[7]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

1.41%

^[4],[7]

One Year

rr_ExpenseExampleYear01

$ 144

Three Years

rr_ExpenseExampleYear03

446

Five Years

rr_ExpenseExampleYear05

771

Ten Years

rr_ExpenseExampleYear10

$ 1,691

Annual Return 2016

rr_AnnualReturn2016

(0.30%)

Annual Return 2017

rr_AnnualReturn2017

42.35%

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.95%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Calendar Quarter Return at NAV

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2017

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.82%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Calendar Quarter Return at NAV

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2016

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(9.47%)

1 Year

rr_AverageAnnualReturnYear01

42.35%

Since Inception

rr_AverageAnnualReturnSinceInception

19.01%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2015

WCM International Small Cap Growth Fund | Return After Taxes on Distributions | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

41.96%

^[8]

Since Inception

rr_AverageAnnualReturnSinceInception

18.78%

^[8]

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2015

^[8]

WCM International Small Cap Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class Shares

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

24.26%

^[8]

Since Inception

rr_AverageAnnualReturnSinceInception

14.76%

^[8]

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2015

^[8]

WCM International Small Cap Growth Fund | MSCI ACWI ex USA Small Cap Index (reflects no deduction for fees, expenses or taxes)

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

31.65%

Since Inception

rr_AverageAnnualReturnSinceInception

16.27%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2015

[1] The total annual fund operating expenses and net operating expenses after fee waiver and/or expense reimbursements do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[2] Institutional Class started on May 31, 2011. Investor Class started on August 31, 2011. The performance figures for Investor Class include the performance for Institutional Class for the periods prior to the start date of Investor Class, adjusted for the difference in Investor Class and Institutional Class expenses. Investor Class imposes higher expenses than Institutional Class.

[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 Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.

[4] The "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" do not correlate to the ratio of expense to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[5] 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 Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.65% and 1.40% of the average daily net assets of the Fund's Investor Class and Institutional Class shares of the Fund, respectively. This agreement is in effect until August 31, 2028, 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.

[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 Form N-1A, expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.40% and 1.15% 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, 2028 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] 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 1.40% of the average daily net assets of the Institutional Class Shares of the Fund. This agreement is in effect until August 31, 2028 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.

[8] 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.