v3.26.3
Shareholder Report
 12 Months Ended
Jul. 31, 2026
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 Jul. 31, 2026
Shareholder Report Annual or Semi-Annual annual shareholder report
Class A  
Shareholder Report [Line Items]  
Fund Name Western Asset Municipal High Income Fund
Class Name Class A
Trading Symbol STXAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Municipal High Income Fund for the period August 1, 2025, to July 31, 2026.
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
$87
0.84%
Expenses Paid, Amount $ 87
Expense Ratio, Percent 0.84%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended July 31, 2026, Class A shares of Western Asset Municipal High Income Fund returned 7.09%. The Fund compares its performance to the Bloomberg Municipal Bond Index, which returned 5.27% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Rates positioning
↑
Overweight industrial revenue
↑
Issue selection within industrial revenue
Top detractors from performance:
↓
Overweight education
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 July 31, 2026
 
1 Year
5 Year
10 Year
Class A
7.09
0.72
2.24
Class A (with sales charge)
3.07
-0.15
1.80
Bloomberg Municipal Bond Index
5.27
0.51
1.95
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 $ 243,783,897
Holdings Count | $ / shares 206
Advisory Fees Paid, Amount $ 1,112,713
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2026)
Total Net Assets
$243,783,897
Total Number of Portfolio Holdings
206
Total Management Fee Paid
$1,112,713
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of July 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [1]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Western Asset Municipal High Income Fund
Class Name Class C
Trading Symbol SMHLX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Municipal High Income Fund for the period August 1, 2025, to July 31, 2026.
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
$142
1.37%
Expenses Paid, Amount $ 142
Expense Ratio, Percent 1.37%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended July 31, 2026, Class C shares of Western Asset Municipal High Income Fund returned 6.63%. The Fund compares its performance to the Bloomberg Municipal Bond Index, which returned 5.27% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Rates positioning
↑
Overweight industrial revenue
↑
Issue selection within industrial revenue
Top detractors from performance:
↓
Overweight education
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 July 31, 2026
 
1 Year
5 Year
10 Year
Class C
6.63
0.19
1.67
Class C (with sales charge)
5.63
0.19
1.67
Bloomberg Municipal Bond Index
5.27
0.51
1.95
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 $ 243,783,897
Holdings Count | $ / shares 206
Advisory Fees Paid, Amount $ 1,112,713
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2026)
Total Net Assets
$243,783,897
Total Number of Portfolio Holdings
206
Total Management Fee Paid
$1,112,713
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of July 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [2]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Western Asset Municipal High Income Fund
Class Name Class I
Trading Symbol LMHIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Municipal High Income Fund for the period August 1, 2025, to July 31, 2026.
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
$64
0.62%
[3]
Expenses Paid, Amount $ 64
Expense Ratio, Percent 0.62%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended July 31, 2026, Class I shares of Western Asset Municipal High Income Fund returned 7.42%. The Fund compares its performance to the Bloomberg Municipal Bond Index, which returned 5.27% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Rates positioning
↑
Overweight industrial revenue
↑
Issue selection within industrial revenue
Top detractors from performance:
↓
Overweight education
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 July 31, 2026
 
1 Year
5 Year
10 Year
Class I
7.42
0.92
2.42
Bloomberg Municipal Bond Index
5.27
0.51
1.95
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 $ 243,783,897
Holdings Count | $ / shares 206
Advisory Fees Paid, Amount $ 1,112,713
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2026)
Total Net Assets
$243,783,897
Total Number of Portfolio Holdings
206
Total Management Fee Paid
$1,112,713
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of July 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [4]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
* Does not include derivatives, except purchased options, if any.  
[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.