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Shareholder Report
 12 Months Ended
Apr. 30, 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 Apr. 30, 2025
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, 2024, to April 30, 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
$76
0.75%
[1]
Expenses Paid, Amount $ 76
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, 2025, Class A shares of Western Asset Oregon Municipals Fund returned 1.94%. The Fund compares its performance to the Bloomberg Oregon Municipal Bond Index, which returned 1.60% for the same period.  
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Security selection within the power, state general obligation and education sectors.
↑
Overweight to lower-rated securities.
Top detractors from performance:
↓
Rates positioning detracted from performance.
↓
Underweight to transportation as the sector outperformed during the period.
Use of derivatives and the impact on performance:
The Fund utilized Treasury futures to manage duration risk, which was a net contributor to 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 April 30, 2025
 
1 Year
5 Year
10 Year
Class A
1.94
0.82
1.44
Class A (with sales charge)
-1.89
-0.05
1.00
Bloomberg Municipal Bond Index
1.66
1.17
2.10
Bloomberg Oregon Municipal Bond Index
1.60
0.55
1.92
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 $ 41,943,351
Holdings Count | $ / shares 56 [2]
Advisory Fees Paid, Amount $ 30,517
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$41,943,351
Total Number of Portfolio Holdings*
56
Total Management Fee Paid
$30,517
Portfolio Turnover Rate
18%
[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 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, 2024, to April 30, 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
$131
1.30%
[3]
Expenses Paid, Amount $ 131
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, 2025, Class C shares of Western Asset Oregon Municipals Fund returned 1.38%. The Fund compares its performance to the Bloomberg Oregon Municipal Bond Index, which returned 1.60% for the same period.  
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Security selection within the power, state general obligation and education sectors.
↑
Overweight to lower-rated securities.
Top detractors from performance:
↓
Rates positioning detracted from performance.
↓
Underweight to transportation as the sector outperformed during the period.
Use of derivatives and the impact on performance:
The Fund utilized Treasury futures to manage duration risk, which was a net contributor to 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 April 30, 2025
 
1 Year
5 Year
10 Year
Class C
1.38
0.27
0.88
Class C (with sales charge)
0.39
0.27
0.88
Bloomberg Municipal Bond Index
1.66
1.17
2.10
Bloomberg Oregon Municipal Bond Index
1.60
0.55
1.92
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 $ 41,943,351
Holdings Count | $ / shares 56 [4]
Advisory Fees Paid, Amount $ 30,517
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$41,943,351
Total Number of Portfolio Holdings*
56
Total Management Fee Paid
$30,517
Portfolio Turnover Rate
18%
[4]
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 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, 2024, to April 30, 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
$56
0.55%
[5]
Expenses Paid, Amount $ 56
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, 2025, Class I shares of Western Asset Oregon Municipals Fund returned 2.14%. The Fund compares its performance to the Bloomberg Oregon Municipal Bond Index, which returned 1.60% for the same period.  
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Security selection within the power, state general obligation and education sectors.
↑
Overweight to lower-rated securities.
Top detractors from performance:
↓
Rates positioning detracted from performance.
↓
Underweight to transportation as the sector outperformed during the period.
Use of derivatives and the impact on performance:
The Fund utilized Treasury futures to manage duration risk, which was a net contributor to 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 April 30, 2025
 
1 Year
5 Year
10 Year
Class I
2.14
0.98
1.59
Bloomberg Municipal Bond Index
1.66
1.17
2.10
Bloomberg Oregon Municipal Bond Index
1.60
0.55
1.92
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 $ 41,943,351
Holdings Count | $ / shares 56 [6]
Advisory Fees Paid, Amount $ 30,517
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$41,943,351
Total Number of Portfolio Holdings*
56
Total Management Fee Paid
$30,517
Portfolio Turnover Rate
18%
[6]
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.