v3.26.1
Shareholder Report
 6 Months Ended
Jun. 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 Jun. 30, 2026
C000146393 [Member]  
Shareholder Report [Line Items]  
Fund Name Robinson Tax Advantaged Income Fund
Class Name Institutional Class
Trading Symbol ROBNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Robinson Tax Advantaged Income Fund (“Fund”) for the period of January 1, 2026 to June 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://libertystreetfunds.com/robinson-tax-advantaged-income-fund/. You can also request this information by contacting us at (800) 207-7108.
Additional Information Phone Number (800) 207-7108
Additional Information Website https://libertystreetfunds.com/robinson-tax-advantaged-income-fund/
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 investment
Robinson Tax Advantaged Income Fund
(Institutional Class/ROBNX)		 $69 1.35%1
​1
Annualized.
Expenses Paid, Amount $ 69
Expense Ratio, Percent 1.35% [1]
Net Assets $ 222,846,074
Holdings Count | Holding 37
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $222,846,074
Total number of portfolio holdings 37
Portfolio turnover rate as of the end of the reporting period 29%
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 exclude short-term holdings, if any.
Top Ten Holdings
BlackRock MuniHoldings Fund, Inc. 11.0%
BlackRock MuniYield Quality Fund, Inc. 8.5%
BlackRock MuniYield Quality Fund III, Inc. 8.1%
BlackRock MuniHoldings California Quality Fund, Inc. 5.5%
Eaton Vance Municipal Bond Fund 4.7%
BlackRock MuniYield New York Quality Fund, Inc. 4.6%
RiverNorth Flexible Municipal Income Fund II, Inc. 3.9%
Western Asset Managed Municipals Fund, Inc. 3.4%
NYLI MacKay DefinedTerm Municipal Opportunities Fund 3.2%
Putnam Municipal Opportunities Trust 3.1%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings
BlackRock MuniHoldings Fund, Inc. 11.0%
BlackRock MuniYield Quality Fund, Inc. 8.5%
BlackRock MuniYield Quality Fund III, Inc. 8.1%
BlackRock MuniHoldings California Quality Fund, Inc. 5.5%
Eaton Vance Municipal Bond Fund 4.7%
BlackRock MuniYield New York Quality Fund, Inc. 4.6%
RiverNorth Flexible Municipal Income Fund II, Inc. 3.9%
Western Asset Managed Municipals Fund, Inc. 3.4%
NYLI MacKay DefinedTerm Municipal Opportunities Fund 3.2%
Putnam Municipal Opportunities Trust 3.1%
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.
C000146392 [Member]  
Shareholder Report [Line Items]  
Fund Name Robinson Tax Advantaged Income Fund
Class Name Class C
Trading Symbol ROBCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Robinson Tax Advantaged Income Fund (“Fund”) for the period of January 1, 2026 to June 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://libertystreetfunds.com/robinson-tax-advantaged-income-fund/. You can also request this information by contacting us at (800) 207-7108.
Additional Information Phone Number (800) 207-7108
Additional Information Website https://libertystreetfunds.com/robinson-tax-advantaged-income-fund/
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 investment
Robinson Tax Advantaged Income Fund
(Class C/ROBCX)		 $119 2.35%1
​1
Annualized.
Expenses Paid, Amount $ 119
Expense Ratio, Percent 2.35% [2]
Net Assets $ 222,846,074
Holdings Count | Holding 37
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $222,846,074
Total number of portfolio holdings 37
Portfolio turnover rate as of the end of the reporting period 29%
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 exclude short-term holdings, if any.
Top Ten Holdings
BlackRock MuniHoldings Fund, Inc. 11.0%
BlackRock MuniYield Quality Fund, Inc. 8.5%
BlackRock MuniYield Quality Fund III, Inc. 8.1%
BlackRock MuniHoldings California Quality Fund, Inc. 5.5%
Eaton Vance Municipal Bond Fund 4.7%
BlackRock MuniYield New York Quality Fund, Inc. 4.6%
RiverNorth Flexible Municipal Income Fund II, Inc. 3.9%
Western Asset Managed Municipals Fund, Inc. 3.4%
NYLI MacKay DefinedTerm Municipal Opportunities Fund 3.2%
Putnam Municipal Opportunities Trust 3.1%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings
BlackRock MuniHoldings Fund, Inc. 11.0%
BlackRock MuniYield Quality Fund, Inc. 8.5%
BlackRock MuniYield Quality Fund III, Inc. 8.1%
BlackRock MuniHoldings California Quality Fund, Inc. 5.5%
Eaton Vance Municipal Bond Fund 4.7%
BlackRock MuniYield New York Quality Fund, Inc. 4.6%
RiverNorth Flexible Municipal Income Fund II, Inc. 3.9%
Western Asset Managed Municipals Fund, Inc. 3.4%
NYLI MacKay DefinedTerm Municipal Opportunities Fund 3.2%
Putnam Municipal Opportunities Trust 3.1%
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.
C000146391 [Member]  
Shareholder Report [Line Items]  
Fund Name Robinson Tax Advantaged Income Fund
Class Name Class A
Trading Symbol ROBAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Robinson Tax Advantaged Income Fund (“Fund”) for the period of January 1, 2026 to June 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://libertystreetfunds.com/robinson-tax-advantaged-income-fund/. You can also request this information by contacting us at (800) 207-7108.
Additional Information Phone Number (800) 207-7108
Additional Information Website https://libertystreetfunds.com/robinson-tax-advantaged-income-fund/
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 investment
Robinson Tax Advantaged Income Fund
(Class A/ROBAX)		 $81 1.60%1
​1
Annualized.
Expenses Paid, Amount $ 81
Expense Ratio, Percent 1.60% [3]
Net Assets $ 222,846,074
Holdings Count | Holding 37
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $222,846,074
Total number of portfolio holdings 37
Portfolio turnover rate as of the end of the reporting period 29%
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 exclude short-term holdings, if any.
Top Ten Holdings
BlackRock MuniHoldings Fund, Inc. 11.0%
BlackRock MuniYield Quality Fund, Inc. 8.5%
BlackRock MuniYield Quality Fund III, Inc. 8.1%
BlackRock MuniHoldings California Quality Fund, Inc. 5.5%
Eaton Vance Municipal Bond Fund 4.7%
BlackRock MuniYield New York Quality Fund, Inc. 4.6%
RiverNorth Flexible Municipal Income Fund II, Inc. 3.9%
Western Asset Managed Municipals Fund, Inc. 3.4%
NYLI MacKay DefinedTerm Municipal Opportunities Fund 3.2%
Putnam Municipal Opportunities Trust 3.1%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings
BlackRock MuniHoldings Fund, Inc. 11.0%
BlackRock MuniYield Quality Fund, Inc. 8.5%
BlackRock MuniYield Quality Fund III, Inc. 8.1%
BlackRock MuniHoldings California Quality Fund, Inc. 5.5%
Eaton Vance Municipal Bond Fund 4.7%
BlackRock MuniYield New York Quality Fund, Inc. 4.6%
RiverNorth Flexible Municipal Income Fund II, Inc. 3.9%
Western Asset Managed Municipals Fund, Inc. 3.4%
NYLI MacKay DefinedTerm Municipal Opportunities Fund 3.2%
Putnam Municipal Opportunities Trust 3.1%
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.
C000164392 [Member]  
Shareholder Report [Line Items]  
Fund Name Robinson Opportunistic Income Fund
Class Name Class A
Trading Symbol RBNAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Robinson Opportunistic Income Fund (“Fund”) for the period of January 1, 2026 to June 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://libertystreetfunds.com/robinson-opportunistic-income-fund/. You can also request this information by contacting us at (800) 207-7108.
Additional Information Phone Number (800) 207-7108
Additional Information Website https://libertystreetfunds.com/robinson-opportunistic-income-fund/
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 investment
Robinson Opportunistic Income Fund
(Class A/RBNAX)		 $79 1.61%1
​1
Annualized.
Expenses Paid, Amount $ 79
Expense Ratio, Percent 1.61% [4]
Net Assets $ 10,666,704
Holdings Count | Holding 39
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $10,666,704
Total number of portfolio holdings 39
Portfolio turnover rate as of the end of the reporting period 41%
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 exclude short-term holdings, if any.
Top Ten Holdings
Flaherty & Crumrine Preferred & Income Fund, Inc. 6.0%
FS Credit Opportunities Corp. 5.6%
FS Specialty Lending Fund 5.5%
DoubleLine Yield Opportunities Fund 5.5%
Western Asset Global High Income Fund, Inc. 5.5%
KKR Income Opportunities Fund 5.5%
Western Asset High Income Fund II, Inc. 5.4%
BlackRock Multi-Sector Income Trust 5.4%
Western Asset Inflation-Linked Opportunities & Income Fund 5.4%
Western Asset Mortgage Opportunity Fund, Inc. 5.4%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Flaherty & Crumrine Preferred & Income Fund, Inc. 6.0%
FS Credit Opportunities Corp. 5.6%
FS Specialty Lending Fund 5.5%
DoubleLine Yield Opportunities Fund 5.5%
Western Asset Global High Income Fund, Inc. 5.5%
KKR Income Opportunities Fund 5.5%
Western Asset High Income Fund II, Inc. 5.4%
BlackRock Multi-Sector Income Trust 5.4%
Western Asset Inflation-Linked Opportunities & Income Fund 5.4%
Western Asset Mortgage Opportunity Fund, Inc. 5.4%
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.
C000164393 [Member]  
Shareholder Report [Line Items]  
Fund Name Robinson Opportunistic Income Fund
Class Name Class C
Trading Symbol RBNCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Robinson Opportunistic Income Fund (“Fund”) for the period of January 1, 2026 to June 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://libertystreetfunds.com/robinson-opportunistic-income-fund/. You can also request this information by contacting us at (800) 207-7108.
Additional Information Phone Number (800) 207-7108
Additional Information Website https://libertystreetfunds.com/robinson-opportunistic-income-fund/
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 investment
Robinson Opportunistic Income Fund
(Class C/RBNCX)		 $116 2.36%1
​1
Annualized.
Expenses Paid, Amount $ 116
Expense Ratio, Percent 2.36% [5]
Net Assets $ 10,666,704
Holdings Count | Holding 39
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $10,666,704
Total number of portfolio holdings 39
Portfolio turnover rate as of the end of the reporting period 41%
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 exclude short-term holdings, if any.
Top Ten Holdings
Flaherty & Crumrine Preferred & Income Fund, Inc. 6.0%
FS Credit Opportunities Corp. 5.6%
FS Specialty Lending Fund 5.5%
DoubleLine Yield Opportunities Fund 5.5%
Western Asset Global High Income Fund, Inc. 5.5%
KKR Income Opportunities Fund 5.5%
Western Asset High Income Fund II, Inc. 5.4%
BlackRock Multi-Sector Income Trust 5.4%
Western Asset Inflation-Linked Opportunities & Income Fund 5.4%
Western Asset Mortgage Opportunity Fund, Inc. 5.4%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Flaherty & Crumrine Preferred & Income Fund, Inc. 6.0%
FS Credit Opportunities Corp. 5.6%
FS Specialty Lending Fund 5.5%
DoubleLine Yield Opportunities Fund 5.5%
Western Asset Global High Income Fund, Inc. 5.5%
KKR Income Opportunities Fund 5.5%
Western Asset High Income Fund II, Inc. 5.4%
BlackRock Multi-Sector Income Trust 5.4%
Western Asset Inflation-Linked Opportunities & Income Fund 5.4%
Western Asset Mortgage Opportunity Fund, Inc. 5.4%
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.
C000164394 [Member]  
Shareholder Report [Line Items]  
Fund Name Robinson Opportunistic Income Fund
Class Name Institutional Class
Trading Symbol RBNNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Robinson Opportunistic Income Fund (“Fund”) for the period of January 1, 2026 to June 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://libertystreetfunds.com/robinson-opportunistic-income-fund/. You can also request this information by contacting us at (800) 207-7108.
Additional Information Phone Number (800) 207-7108
Additional Information Website https://libertystreetfunds.com/robinson-opportunistic-income-fund/
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 investment
Robinson Opportunistic Income Fund
(Institutional Class/RBNNX)		 $67 1.36%1
​1
Annualized.
Expenses Paid, Amount $ 67
Expense Ratio, Percent 1.36% [6]
Net Assets $ 10,666,704
Holdings Count | Holding 39
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics that you should pay attention to.
Fund net assets $10,666,704
Total number of portfolio holdings 39
Portfolio turnover rate as of the end of the reporting period 41%
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 exclude short-term holdings, if any.
Top Ten Holdings
Flaherty & Crumrine Preferred & Income Fund, Inc. 6.0%
FS Credit Opportunities Corp. 5.6%
FS Specialty Lending Fund 5.5%
DoubleLine Yield Opportunities Fund 5.5%
Western Asset Global High Income Fund, Inc. 5.5%
KKR Income Opportunities Fund 5.5%
Western Asset High Income Fund II, Inc. 5.4%
BlackRock Multi-Sector Income Trust 5.4%
Western Asset Inflation-Linked Opportunities & Income Fund 5.4%
Western Asset Mortgage Opportunity Fund, Inc. 5.4%
Asset Allocation
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Flaherty & Crumrine Preferred & Income Fund, Inc. 6.0%
FS Credit Opportunities Corp. 5.6%
FS Specialty Lending Fund 5.5%
DoubleLine Yield Opportunities Fund 5.5%
Western Asset Global High Income Fund, Inc. 5.5%
KKR Income Opportunities Fund 5.5%
Western Asset High Income Fund II, Inc. 5.4%
BlackRock Multi-Sector Income Trust 5.4%
Western Asset Inflation-Linked Opportunities & Income Fund 5.4%
Western Asset Mortgage Opportunity Fund, Inc. 5.4%
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.
[5] Annualized.
[6]
Annualized.