| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| 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 | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Jun. 30, 2024 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 | Jun. 30, 2024 | |
| Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Mortgage Total Return Fund | |
| Class Name | Class A | |
| Trading Symbol | SGVAX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Mortgage Total Return Fund for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-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 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 $49 0.98% | [1],[2] |
| Expenses Paid, Amount | $ 49 | |
| Expense Ratio, Percent | 0.98% | |
| Net Assets | $ 403,447,496 | |
| Holdings Count | $ / shares | 623 | [3] |
| Investment Company Portfolio Turnover | 99% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $403,447,496 Total Number of Portfolio Holdings * 623 Portfolio Turnover Rate 99% | [3] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class C | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Mortgage Total Return Fund | |
| Class Name | Class C | |
| Trading Symbol | LWMSX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Mortgage Total Return Fund for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-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 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 $82 1.65% | [4],[5] |
| Expenses Paid, Amount | $ 82 | |
| Expense Ratio, Percent | 1.65% | |
| Net Assets | $ 403,447,496 | |
| Holdings Count | $ / shares | 623 | [6] |
| Investment Company Portfolio Turnover | 99% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $403,447,496 Total Number of Portfolio Holdings * 623 Portfolio Turnover Rate 99% | [6] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class C1 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Mortgage Total Return Fund | |
| Class Name | Class C1 | |
| Trading Symbol | SGSLX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Mortgage Total Return Fund for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-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 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 C1 $87 1.75% | [7],[8] |
| Expenses Paid, Amount | $ 87 | |
| Expense Ratio, Percent | 1.75% | |
| Net Assets | $ 403,447,496 | |
| Holdings Count | $ / shares | 623 | [9] |
| Investment Company Portfolio Turnover | 99% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $403,447,496 Total Number of Portfolio Holdings * 623 Portfolio Turnover Rate 99% | [9] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Mortgage Total Return Fund | |
| Class Name | Class I | |
| Trading Symbol | SGSYX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Mortgage Total Return Fund for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-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 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 $34 0.68% | [10],[11] |
| Expenses Paid, Amount | $ 34 | |
| Expense Ratio, Percent | 0.68% | |
| Net Assets | $ 403,447,496 | |
| Holdings Count | $ / shares | 623 | [12] |
| Investment Company Portfolio Turnover | 99% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $403,447,496 Total Number of Portfolio Holdings * 623 Portfolio Turnover Rate 99% | [12] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class IS | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Mortgage Total Return Fund | |
| Class Name | Class IS | |
| Trading Symbol | LMBSX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Mortgage Total Return Fund for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-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 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 IS $28 0.57% | [13],[14] |
| Expenses Paid, Amount | $ 28 | |
| Expense Ratio, Percent | 0.57% | |
| Net Assets | $ 403,447,496 | |
| Holdings Count | $ / shares | 623 | [15] |
| Investment Company Portfolio Turnover | 99% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $403,447,496 Total Number of Portfolio Holdings * 623 Portfolio Turnover Rate 99% | [15] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class 1 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Mortgage Total Return Fund | |
| Class Name | Class 1 | |
| Trading Symbol | SGVSX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Mortgage Total Return Fund for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-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 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 1 $36 0.72% | [16],[17] |
| Expenses Paid, Amount | $ 36 | |
| Expense Ratio, Percent | 0.72% | |
| Net Assets | $ 403,447,496 | |
| Holdings Count | $ / shares | 623 | [18] |
| Investment Company Portfolio Turnover | 99% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $403,447,496 Total Number of Portfolio Holdings * 623 Portfolio Turnover Rate 99% | [18] |
| Holdings [Text Block] | ||
| 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. † Annualized. * Does not include derivatives, except purchased options, if any. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. | ||
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| Class A | Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.70% |
| Class A | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| Class A | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| Class A | Corporate Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| Class A | Preferred Stocks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class A | Convertible Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| Class A | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| Class C | Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.70% |
| Class C | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| Class C | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| Class C | Corporate Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| Class C | Preferred Stocks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class C | Convertible Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| Class C | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| Class C1 | Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.70% |
| Class C1 | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| Class C1 | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| Class C1 | Corporate Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| Class C1 | Preferred Stocks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class C1 | Convertible Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| Class C1 | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| Class I | Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.70% |
| Class I | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| Class I | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| Class I | Corporate Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| Class I | Preferred Stocks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class I | Convertible Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| Class I | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| Class IS | Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.70% |
| Class IS | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| Class IS | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| Class IS | Corporate Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| Class IS | Preferred Stocks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class IS | Convertible Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| Class IS | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| Class 1 | Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.70% |
| Class 1 | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.50% |
| Class 1 | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| Class 1 | Corporate Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| Class 1 | Preferred Stocks [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class 1 | Convertible Bonds & Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| Class 1 | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
