v3.26.1
Shareholder Report
 12 Months Ended
Apr. 30, 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 Apr. 30, 2026
Shareholder Report Annual or Semi-Annual annual shareholder report
Class A  
Shareholder Report [Line Items]  
Fund Name Western Asset Oregon Municipals Fund
Class Name Class A
Trading Symbol SHORX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Oregon Municipals Fund for the period May 1, 2025, to April 30, 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
$77
0.75%
[1]
Expenses Paid, Amount $ 77
Expense Ratio, Percent 0.75%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended April 30, 2026, Class A shares of Western Asset Oregon Municipals Fund returned 5.76%. The Fund compares its performance to the  Bloomberg Oregon Municipal Bond Index, which returned 6.70% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Rates positioning
↑
Overweight education
↑
Issue selection within hospital
Top detractors from performance:
↓
Overweight leasing
↓
Issue selection within pre-refunded
↓
Issue selection within transportation
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 April 30, 2026
 
1 Year
5 Year
10 Year
Class A
5.76
0.51
1.60
Class A (with sales charge)
1.77
-0.36
1.16
Bloomberg Municipal Bond Index
6.34
0.90
2.20
Bloomberg Oregon Municipal Bond Index
6.70
0.62
2.04
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 $ 39,659,455
Holdings Count | $ / shares 49
Advisory Fees Paid, Amount $ 17,920
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2026)
Total Net Assets
$39,659,455
Total Number of Portfolio Holdings
49
Total Management Fee Paid
$17,920
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of April 30, 2026)
Portfolio Composition*  (% of Total Investments)
image
 [2]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Western Asset Oregon Municipals Fund
Class Name Class C
Trading Symbol SORLX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Oregon Municipals Fund for the period May 1, 2025, to April 30, 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
$133
1.30%
[3]
Expenses Paid, Amount $ 133
Expense Ratio, Percent 1.30%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended April 30, 2026, Class C shares of Western Asset Oregon Municipals Fund returned 5.20%. The Fund compares its performance to the  Bloomberg Oregon Municipal Bond Index, which returned 6.70% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Rates positioning
↑
Overweight education
↑
Issue selection within hospital
Top detractors from performance:
↓
Overweight leasing
↓
Issue selection within pre-refunded
↓
Issue selection within transportation
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 April 30, 2026
 
1 Year
5 Year
10 Year
Class C
5.20
-0.05
1.04
Class C (with sales charge)
4.20
-0.05
1.04
Bloomberg Municipal Bond Index
6.34
0.90
2.20
Bloomberg Oregon Municipal Bond Index
6.70
0.62
2.04
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 $ 39,659,455
Holdings Count | $ / shares 49
Advisory Fees Paid, Amount $ 17,920
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2026)
Total Net Assets
$39,659,455
Total Number of Portfolio Holdings
49
Total Management Fee Paid
$17,920
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of April 30, 2026)
Portfolio Composition*  (% of Total Investments)
image
 [4]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Western Asset Oregon Municipals Fund
Class Name Class I
Trading Symbol LMOOX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Oregon Municipals Fund for the period May 1, 2025, to April 30, 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
$57
0.55%
[5]
Expenses Paid, Amount $ 57
Expense Ratio, Percent 0.55%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended April 30, 2026, Class I shares of Western Asset Oregon Municipals Fund returned 5.97%. The Fund compares its performance to the  Bloomberg Oregon Municipal Bond Index, which returned 6.70% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Rates positioning
↑
Overweight education
↑
Issue selection within hospital
Top detractors from performance:
↓
Overweight leasing
↓
Issue selection within pre-refunded
↓
Issue selection within transportation
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 April 30, 2026
 
1 Year
5 Year
10 Year
Class I
5.97
0.69
1.76
Bloomberg Municipal Bond Index
6.34
0.90
2.20
Bloomberg Oregon Municipal Bond Index
6.70
0.62
2.04
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 $ 39,659,455
Holdings Count | $ / shares 49
Advisory Fees Paid, Amount $ 17,920
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2026)
Total Net Assets
$39,659,455
Total Number of Portfolio Holdings
49
Total Management Fee Paid
$17,920
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of April 30, 2026)
Portfolio Composition*  (% of Total Investments)
image
 [6]
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.