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Shareholder Report
 6 Months Ended
Feb. 28, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Legg Mason Partners Institutional Trust
Entity Central Index Key 0000889512
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2025
Investor Shares  
Shareholder Report [Line Items]  
Fund Name Western Asset Select Tax Free Reserves
Class Name Investor Shares
Trading Symbol LTFXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Western Asset Select Tax Free Reserves for the period September 1, 2024, to February 28, 2025.
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.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 1-800-625-4554, or 1-203-703-6002.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-625-4554, or 1-203-703-6002
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Investor Shares
$11
0.23%
[1],[2]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.23%
Material Change Date Oct. 02, 2023
Net Assets $ 261,836,398
Holdings Count | $ / shares 96
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$261,836,398
Total Number of Portfolio Holdings
96
Holdings [Text Block]
image
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
Effective October 2, 2023, pursuant to amendments to Rule 2a-7 under the Investment Company Act of 1940, as amended, the Fund may no longer impose a redemption gate and the application of liquidity fees, if any, is no longer tied to the Fund’s weekly liquid assets.
This is a summary of certain changes to the Fund since September 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by January 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 1-800-625-4554, or 1-203-703-6002 or Prospectus-request@Franklintempleton.com.
Updated Prospectus Phone Number 1-800-625-4554, or 1-203-703-6002
Updated Prospectus Email Address Prospectus-request@Franklintempleton.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Select Shares  
Shareholder Report [Line Items]  
Fund Name Western Asset Select Tax Free Reserves
Class Name Select Shares
Trading Symbol CIFXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Western Asset Select Tax Free Reserves for the period September 1, 2024, to February 28, 2025.
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.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at 1-800-625-4554, or 1-203-703-6002.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-625-4554, or 1-203-703-6002
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Select Shares
$9
0.18%
[3],[4]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18%
Material Change Date Oct. 02, 2023
Net Assets $ 261,836,398
Holdings Count | $ / shares 96
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$261,836,398
Total Number of Portfolio Holdings
96
Holdings [Text Block]
image
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
Effective October 2, 2023, pursuant to amendments to Rule 2a-7 under the Investment Company Act of 1940, as amended, the Fund may no longer impose a redemption gate and the application of liquidity fees, if any, is no longer tied to the Fund’s weekly liquid assets.
This is a summary of certain changes to the Fund since September 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by January 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 1-800-625-4554, or 1-203-703-6002 or Prospectus-request@Franklintempleton.com.
Updated Prospectus Phone Number 1-800-625-4554, or 1-203-703-6002
Updated Prospectus Email Address Prospectus-request@Franklintempleton.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. Additional amounts may be voluntarily waived and/or reimbursed from time to time.
[2]
† Annualized.
[3]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. Additional amounts may be voluntarily waived and/or reimbursed from time to time.
[4]
† Annualized.