v3.25.2
Shareholder Report
 12 Months Ended
May 31, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Legg Mason Partners Income Trust
Entity Central Index Key 0000764624
Entity Investment Company Type N-1A
Document Period End Date May 31, 2025
Class A  
Shareholder Report [Line Items]  
Fund Name Western Asset Ultra-Short Income Fund
Class Name Class A
Trading Symbol ARMZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (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*
Class A
$67
0.65%
[1]
Expenses Paid, Amount $ 67
Expense Ratio, Percent 0.65%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended May 31, 2025, Class A shares of Western Asset Ultra-Short Income Fund returned 5.35%. The Fund compares its performance to the ICE BofA 3-Month U.S. Treasury Bill Index, which returned 4.76% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
An overweight to investment-grade credit
↑
An overweight to asset-backed securities
↑
Long duration position
Top detractors from performance:
↓
Yield curve positioning
Use of derivatives and the impact on performance:
Interest rate futures, options and swaps were used to manage duration and yield curve exposure, in aggregate detracted from performance. Credit default swaps on investment-grade indices were used to manage credit exposures and had a slightly positive impact on performance.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended May 31, 2025
 
1 Year
5 Year
10 Year
Class A
5.35
3.27
2.59
Bloomberg U.S. Aggregate Index
5.46
-0.90
1.49
ICE BofA 3-Month U.S. Treasury Bill Index
4.76
2.70
1.94
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at 877-6LM-FUND/656-3863 or visit
https://www.franklintempleton.com/investments/options/mutual-funds.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 410,936,039
Holdings Count | $ / shares 448 [2]
Advisory Fees Paid, Amount $ 961,612
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Total Net Assets
$410,936,039
Total Number of Portfolio Holdings*
448
Total Management Fee Paid
$961,612
Portfolio Turnover Rate
35%
[2]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Western Asset Ultra-Short Income Fund
Class Name Class C
Trading Symbol LWAIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (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*
Class C
$144
1.41%
[3]
Expenses Paid, Amount $ 144
Expense Ratio, Percent 1.41%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended May 31, 2025, Class C shares of Western Asset Ultra-Short Income Fund returned 4.52%. The Fund compares its performance to the ICE BofA 3-Month U.S. Treasury Bill Index, which returned 4.76% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
An overweight to investment-grade credit
↑
An overweight to asset-backed securities
↑
Long duration position
Top detractors from performance:
↓
Yield curve positioning
Use of derivatives and the impact on performance:
Interest rate futures, options and swaps were used to manage duration and yield curve exposure, in aggregate detracted from performance. Credit default swaps on investment-grade indices were used to manage credit exposures and had a slightly positive impact on performance.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended May 31, 2025
 
1 Year
5 Year
10 Year
Class C
4.52
2.45
1.96
Class C (with sales charge)
3.52
2.45
1.96
Bloomberg U.S. Aggregate Index
5.46
-0.90
1.49
ICE BofA 3-Month U.S. Treasury Bill Index
4.76
2.70
1.94
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at 877-6LM-FUND/656-3863 or visit
https://www.franklintempleton.com/investments/options/mutual-funds.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 410,936,039
Holdings Count | $ / shares 448 [4]
Advisory Fees Paid, Amount $ 961,612
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Total Net Assets
$410,936,039
Total Number of Portfolio Holdings*
448
Total Management Fee Paid
$961,612
Portfolio Turnover Rate
35%
[4]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C1  
Shareholder Report [Line Items]  
Fund Name Western Asset Ultra-Short Income Fund
Class Name Class C1
Trading Symbol ARMGX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (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*
Class C1
$141
1.38%
[5]
Expenses Paid, Amount $ 141
Expense Ratio, Percent 1.38%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended May 31, 2025, Class C1 shares of Western Asset Ultra-Short Income Fund returned 4.47%. The Fund compares its performance to the ICE BofA 3-Month U.S. Treasury Bill Index, which returned 4.76% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
An overweight to investment-grade credit
↑
An overweight to asset-backed securities
↑
Long duration position
Top detractors from performance:
↓
Yield curve positioning
Use of derivatives and the impact on performance:
Interest rate futures, options and swaps were used to manage duration and yield curve exposure, in aggregate detracted from performance. Credit default swaps on investment-grade indices were used to manage credit exposures and had a slightly positive impact on performance.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended May 31, 2025
 
1 Year
5 Year
10 Year
Class C1
4.47
2.63
1.98
Bloomberg U.S. Aggregate Index
5.46
-0.90
1.49
ICE BofA 3-Month U.S. Treasury Bill Index
4.76
2.70
1.94
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at 877-6LM-FUND/656-3863 or visit
https://www.franklintempleton.com/investments/options/mutual-funds.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 410,936,039
Holdings Count | $ / shares 448 [6]
Advisory Fees Paid, Amount $ 961,612
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Total Net Assets
$410,936,039
Total Number of Portfolio Holdings*
448
Total Management Fee Paid
$961,612
Portfolio Turnover Rate
35%
[6]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Western Asset Ultra-Short Income Fund
Class Name Class I
Trading Symbol SBAYX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (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*
Class I
$39
0.38%
[7]
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.38%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended May 31, 2025, Class I shares of Western Asset Ultra-Short Income Fund returned 5.52%. The Fund compares its performance to the ICE BofA 3-Month U.S. Treasury Bill Index, which returned 4.76% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
An overweight to investment-grade credit
↑
An overweight to asset-backed securities
↑
Long duration position
Top detractors from performance:
↓
Yield curve positioning
Use of derivatives and the impact on performance:
Interest rate futures, options and swaps were used to manage duration and yield curve exposure, in aggregate detracted from performance. Credit default swaps on investment-grade indices were used to manage credit exposures and had a slightly positive impact on performance.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended May 31, 2025
 
1 Year
5 Year
10 Year
Class I
5.52
3.53
2.83
Bloomberg U.S. Aggregate Index
5.46
-0.90
1.49
ICE BofA 3-Month U.S. Treasury Bill Index
4.76
2.70
1.94
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at 877-6LM-FUND/656-3863 or visit
https://www.franklintempleton.com/investments/options/mutual-funds.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 410,936,039
Holdings Count | $ / shares 448 [8]
Advisory Fees Paid, Amount $ 961,612
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Total Net Assets
$410,936,039
Total Number of Portfolio Holdings*
448
Total Management Fee Paid
$961,612
Portfolio Turnover Rate
35%
[8]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class IS  
Shareholder Report [Line Items]  
Fund Name Western Asset Ultra-Short Income Fund
Class Name Class IS
Trading Symbol ARMLX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 877-6LM-FUND/656-3863.
Additional Information Phone Number 877-6LM-FUND/656-3863
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (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*
Class IS
$36
0.35%
[9]
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.35%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended May 31, 2025, Class IS shares of Western Asset Ultra-Short Income Fund returned 5.66%. The Fund compares its performance to the ICE BofA 3-Month U.S. Treasury Bill Index, which returned 4.76% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
An overweight to investment-grade credit
↑
An overweight to asset-backed securities
↑
Long duration position
Top detractors from performance:
↓
Yield curve positioning
Use of derivatives and the impact on performance:
Interest rate futures, options and swaps were used to manage duration and yield curve exposure, in aggregate detracted from performance. Credit default swaps on investment-grade indices were used to manage credit exposures and had a slightly positive impact on performance.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended May 31, 2025
 
1 Year
5 Year
10 Year
Class IS
5.66
3.58
2.89
Bloomberg U.S. Aggregate Index
5.46
-0.90
1.49
ICE BofA 3-Month U.S. Treasury Bill Index
4.76
2.70
1.94
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at 877-6LM-FUND/656-3863 or visit
https://www.franklintempleton.com/investments/options/mutual-funds.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 410,936,039
Holdings Count | $ / shares 448 [10]
Advisory Fees Paid, Amount $ 961,612
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Total Net Assets
$410,936,039
Total Number of Portfolio Holdings*
448
Total Management Fee Paid
$961,612
Portfolio Turnover Rate
35%
[10]
Holdings [Text Block]
image
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.
[2]
* Does not include derivatives, except purchased options, if any.
[3]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[4]
* Does not include derivatives, except purchased options, if any.
[5]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[6]
* Does not include derivatives, except purchased options, if any.
[7]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[8]
* Does not include derivatives, except purchased options, if any.
[9]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[10]
* Does not include derivatives, except purchased options, if any.