v3.26.1
Shareholder Report
 6 Months Ended
May 31, 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 May 31, 2026
C000121984 [Member]  
Shareholder Report [Line Items]  
Fund Name Riverbridge Growth Fund
Class Name Investor Class
Trading Symbol RIVRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Riverbridge Growth Fund (“Fund”) for the period of December 1, 2025 to May 31, 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://riverbridge.com/growth-fund/. You can also request this information by contacting us at (888) 447-4470.
Additional Information Phone Number (888) 447-4470
Additional Information Website https://riverbridge.com/growth-fund/
Expenses [Text Block]
Fund Expenses
(Based on a hypothetical $10,000 investment)
Fund (Class) Cost of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Riverbridge Growth Fund
(Investor Class/RIVRX)		 $59 1.22%1
​1
Annualized.
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.22% [1]
Net Assets $ 112,407,402
Holdings Count | Holding 45
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $112,407,402
Total number of portfolio holdings 45
Portfolio turnover rate as of the end of the reporting period 5%
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 Sector Allocation exclude short-term holdings, if any. The Sector Allocation chart represents Common Stocks of the Fund.
Top Ten Holdings
NVIDIA Corp. 9.2%
Microsoft Corp. 7.4%
Amazon.com, Inc. 5.8%
Analog Devices, Inc. 4.9%
HEICO Corp. 4.5%
Alphabet, Inc. - Class A 3.5%
Alphabet, Inc. - Class C 3.5%
Fastenal Co. 3.4%
ServiceNow, Inc. 2.7%
Tyler Technologies, Inc. 2.5%

Asset Allocation

Graphical Representation - Allocation 1 Chart

Sector Allocation

Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
NVIDIA Corp. 9.2%
Microsoft Corp. 7.4%
Amazon.com, Inc. 5.8%
Analog Devices, Inc. 4.9%
HEICO Corp. 4.5%
Alphabet, Inc. - Class A 3.5%
Alphabet, Inc. - Class C 3.5%
Fastenal Co. 3.4%
ServiceNow, Inc. 2.7%
Tyler Technologies, Inc. 2.5%
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.
C000121983 [Member]  
Shareholder Report [Line Items]  
Fund Name Riverbridge Growth Fund
Class Name Institutional Class
Trading Symbol RIVBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Riverbridge Growth Fund (“Fund”) for the period of December 1, 2025 to May 31, 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://riverbridge.com/growth-fund/. You can also request this information by contacting us at (888) 447-4470.
Additional Information Phone Number (888) 447-4470
Additional Information Website https://riverbridge.com/growth-fund/
Expenses [Text Block]
Fund Expenses
(Based on a hypothetical $10,000 investment)
Fund (Class) Cost of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Riverbridge Growth Fund
(Institutional Class/RIVBX)		 $47 0.97%1
​1
Annualized.
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.97% [2]
Net Assets $ 112,407,402
Holdings Count | Holding 45
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $112,407,402
Total number of portfolio holdings 45
Portfolio turnover rate as of the end of the reporting period 5%
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 Sector Allocation exclude short-term holdings, if any. The Sector Allocation chart represents Common Stocks of the Fund.
Top Ten Holdings
NVIDIA Corp. 9.2%
Microsoft Corp. 7.4%
Amazon.com, Inc. 5.8%
Analog Devices, Inc. 4.9%
HEICO Corp. 4.5%
Alphabet, Inc. - Class A 3.5%
Alphabet, Inc. - Class C 3.5%
Fastenal Co. 3.4%
ServiceNow, Inc. 2.7%
Tyler Technologies, Inc. 2.5%

Asset Allocation

Graphical Representation - Allocation 1 Chart

Sector Allocation

Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
NVIDIA Corp. 9.2%
Microsoft Corp. 7.4%
Amazon.com, Inc. 5.8%
Analog Devices, Inc. 4.9%
HEICO Corp. 4.5%
Alphabet, Inc. - Class A 3.5%
Alphabet, Inc. - Class C 3.5%
Fastenal Co. 3.4%
ServiceNow, Inc. 2.7%
Tyler Technologies, Inc. 2.5%
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.