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Shareholder Report
 6 Months Ended
May 31, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
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, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Class A  
Shareholder Report [Line Items]  
Fund Name Western Asset Massachusetts Municipals Fund
Class Name Class A
Trading Symbol SLMMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Western Asset Massachusetts Municipals Fund for the period  December 1, 2025, to May 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 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*,†
Class A
$38
0.75%
[1],[2]
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.75%
Net Assets $ 29,166,351
Holdings Count | $ / shares 45
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2026)
Total Net Assets
$29,166,351
Total Number of Portfolio Holdings
45
Portfolio Turnover Rate
2%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of May 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [3]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Western Asset Massachusetts Municipals Fund
Class Name Class C
Trading Symbol SMALX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Western Asset Massachusetts Municipals Fund for the period  December 1, 2025, to May 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 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*,†
Class C
$65
1.30%
[4],[5]
Expenses Paid, Amount $ 65
Expense Ratio, Percent 1.30%
Net Assets $ 29,166,351
Holdings Count | $ / shares 45
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2026)
Total Net Assets
$29,166,351
Total Number of Portfolio Holdings
45
Portfolio Turnover Rate
2%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of May 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [6]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name Western Asset Massachusetts Municipals Fund
Class Name Class I
Trading Symbol LHMIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Western Asset Massachusetts Municipals Fund for the period  December 1, 2025, to May 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 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*,†
Class I
$28
0.55%
[7],[8]
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55%
Net Assets $ 29,166,351
Holdings Count | $ / shares 45
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2026)
Total Net Assets
$29,166,351
Total Number of Portfolio Holdings
45
Portfolio Turnover Rate
2%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of May 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [9]
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]
† Annualized.
[3]
* Does not include derivatives, except purchased options, if any.  
[4]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[5]
† Annualized.
[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]
† Annualized.
[9]
* Does not include derivatives, except purchased options, if any.