v3.26.1
Shareholder Report
6 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name INVESTMENT MANAGERS SERIES TRUST
Entity Central Index Key 0001318342
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
C000216360 [Member]  
Shareholder Report [Line Items]  
Fund Name Vaughan Nelson Emerging Markets Fund
Class Name Investor Class
Trading Symbol ADVKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Vaughan Nelson Emerging Markets Fund (“Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-emerging-markets-fund.ADVMX.#literature. You can also request this information by contacting us at (888) 660-6610.
Additional Information Phone Number (888) 660-6610
Additional Information Website https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-emerging-markets-fund.ADVMX.#literature
Expenses [Text Block]
Fund Expenses
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment1
Vaughan Nelson Emerging Markets Fund
(Investor Class/ADVKX)
$67 1.26%1
1
Annualized.
Expenses Paid, Amount $ 67
Expense Ratio, Percent 1.26% [1]
Net Assets $ 63,633,895
Holdings Count | Holding 21
Investment Company Portfolio Turnover 101.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $63,633,895
Total number of portfolio holdings 21
Portfolio turnover rate as of the end of the reporting period 101%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of the total net assets of the Fund. The Top Ten Holdings and Country Allocation exclude short-term holdings, if any. The Country Allocation chart represents Common Stocks of the Fund.
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 14.2%
Alibaba Group Holding Ltd. 10.3%
MercadoLibre, Inc. 4.5%
Komatsu Ltd. 4.4%
Grupo Mexico S.A.B. de C.V. 4.4%
Saudi National Bank 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
JSW Infrastructure Ltd. 4.2%
Cemex S.A.B. de C.V. 4.2%
Emaar Properties PJSC 4.1%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Country Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 14.2%
Alibaba Group Holding Ltd. 10.3%
MercadoLibre, Inc. 4.5%
Komatsu Ltd. 4.4%
Grupo Mexico S.A.B. de C.V. 4.4%
Saudi National Bank 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
JSW Infrastructure Ltd. 4.2%
Cemex S.A.B. de C.V. 4.2%
Emaar Properties PJSC 4.1%
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the Fund's accountants during the reporting period.
C000078165 [Member]  
Shareholder Report [Line Items]  
Fund Name Vaughan Nelson Emerging Markets Fund
Class Name Institutional Class
Trading Symbol ADVMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Vaughan Nelson Emerging Markets Fund (“Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-emerging-markets-fund.ADVMX.#literature. You can also request this information by contacting us at (888) 660-6610.
Additional Information Phone Number (888) 660-6610
Additional Information Website https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-emerging-markets-fund.ADVMX.#literature
Expenses [Text Block]
Fund Expenses
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment1
Vaughan Nelson Emerging Markets Fund
(Institutional Class/ADVMX)
$55 1.03%1
1
Annualized.
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.03% [2]
Net Assets $ 63,633,895
Holdings Count | Holding 21
Investment Company Portfolio Turnover 101.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $63,633,895
Total number of portfolio holdings 21
Portfolio turnover rate as of the end of the reporting period 101%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of the total net assets of the Fund. The Top Ten Holdings and Country Allocation exclude short-term holdings, if any. The Country Allocation chart represents Common Stocks of the Fund.
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 14.2%
Alibaba Group Holding Ltd. 10.3%
MercadoLibre, Inc. 4.5%
Komatsu Ltd. 4.4%
Grupo Mexico S.A.B. de C.V. 4.4%
Saudi National Bank 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
JSW Infrastructure Ltd. 4.2%
Cemex S.A.B. de C.V. 4.2%
Emaar Properties PJSC 4.1%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Country Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 14.2%
Alibaba Group Holding Ltd. 10.3%
MercadoLibre, Inc. 4.5%
Komatsu Ltd. 4.4%
Grupo Mexico S.A.B. de C.V. 4.4%
Saudi National Bank 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
JSW Infrastructure Ltd. 4.2%
Cemex S.A.B. de C.V. 4.2%
Emaar Properties PJSC 4.1%
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the Fund's accountants during the reporting period.
C000135917 [Member]  
Shareholder Report [Line Items]  
Fund Name Vaughan Nelson International Fund
Class Name Institutional Class
Trading Symbol ADVLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Vaughan Nelson International Fund (“Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-international-fund.ADVJX#literature. You can also request this information by contacting us at (888) 660-6610.
Additional Information Phone Number (888) 660-6610
Additional Information Website https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-international-fund.ADVJX#literature
Expenses [Text Block]
Fund Expenses
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment1
Vaughan Nelson International Fund
(Institutional Class/ADVLX)
$48 0.90%1
1
Annualized.
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90% [3]
Net Assets $ 53,471,833
Holdings Count | Holding 24
Investment Company Portfolio Turnover 113.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $53,471,833
Total number of portfolio holdings 24
Portfolio turnover rate as of the end of the reporting period 113%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of the total net assets of the Fund. The Top Ten Holdings and Country Allocation exclude short-term holdings, if any. The Country Allocation chart represents Common Stocks of the Fund.
Top Ten Holdings
Siemens A.G. 6.3%
Shopify, Inc. 5.9%
Komatsu Ltd. 5.8%
Grupo Mexico S.A.B. de C.V. 5.4%
WiseTech Global Ltd. 4.8%
Taiwan Semiconductor Manufacturing Co., Ltd. 4.6%
Alibaba Group Holding Ltd. 4.5%
MercadoLibre, Inc. 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
L'Oreal S.A. 4.2%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Country Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Siemens A.G. 6.3%
Shopify, Inc. 5.9%
Komatsu Ltd. 5.8%
Grupo Mexico S.A.B. de C.V. 5.4%
WiseTech Global Ltd. 4.8%
Taiwan Semiconductor Manufacturing Co., Ltd. 4.6%
Alibaba Group Holding Ltd. 4.5%
MercadoLibre, Inc. 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
L'Oreal S.A. 4.2%
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the Fund's accountants during the reporting period.
C000216361 [Member]  
Shareholder Report [Line Items]  
Fund Name Vaughan Nelson International Fund
Class Name Investor Class
Trading Symbol ADVJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Vaughan Nelson International Fund (“Fund”) for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-international-fund.ADVJX#literature. You can also request this information by contacting us at (888) 660-6610.
Additional Information Phone Number (888) 660-6610
Additional Information Website https://www.im.natixis.com/en-us/products/mutual-funds/funds.vaughan-nelson-international-fund.ADVJX#literature
Expenses [Text Block]
Fund Expenses
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment1
Vaughan Nelson International Fund
(Investor Class/ADVJX)
$62 1.15%1
1
Annualized.
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.15% [4]
Net Assets $ 53,471,833
Holdings Count | Holding 24
Investment Company Portfolio Turnover 113.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $53,471,833
Total number of portfolio holdings 24
Portfolio turnover rate as of the end of the reporting period 113%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of the total net assets of the Fund. The Top Ten Holdings and Country Allocation exclude short-term holdings, if any. The Country Allocation chart represents Common Stocks of the Fund.
Top Ten Holdings
Siemens A.G. 6.3%
Shopify, Inc. 5.9%
Komatsu Ltd. 5.8%
Grupo Mexico S.A.B. de C.V. 5.4%
WiseTech Global Ltd. 4.8%
Taiwan Semiconductor Manufacturing Co., Ltd. 4.6%
Alibaba Group Holding Ltd. 4.5%
MercadoLibre, Inc. 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
L'Oreal S.A. 4.2%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Country Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Siemens A.G. 6.3%
Shopify, Inc. 5.9%
Komatsu Ltd. 5.8%
Grupo Mexico S.A.B. de C.V. 5.4%
WiseTech Global Ltd. 4.8%
Taiwan Semiconductor Manufacturing Co., Ltd. 4.6%
Alibaba Group Holding Ltd. 4.5%
MercadoLibre, Inc. 4.4%
Contemporary Amperex Technology Co., Ltd. - Class A 4.3%
L'Oreal S.A. 4.2%
Accountant Change Disagreements [Text Block]
Changes in and Disagreements with Accountants
There were no changes in or disagreements with the Fund's accountants during the reporting period.
[1]
Annualized.
[2]
Annualized.
[3]
Annualized.
[4]
Annualized.