| Form N-CSR Cover | 6 Months Ended |
| Nov. 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 | Nov. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Nov. 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 | Nov. 30, 2024 | |
| Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Ultra-Short Income Fund | |
| Class Name | Class A | |
| Trading Symbol | ARMZX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to November 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 $33 0.64% | [1],[2] |
| Expenses Paid, Amount | $ 33 | |
| Expense Ratio, Percent | 0.64% | |
| Net Assets | $ 464,420,028 | |
| Holdings Count | $ / shares | 441 | [3] |
| Investment Company Portfolio Turnover | 21% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $464,420,028 Total Number of Portfolio Holdings * 441 Portfolio Turnover Rate 21% | [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 Ultra-Short Income Fund | |
| Class Name | Class C | |
| Trading Symbol | LWAIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to November 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 $72 1.41% | [4],[5] |
| Expenses Paid, Amount | $ 72 | |
| Expense Ratio, Percent | 1.41% | |
| Net Assets | $ 464,420,028 | |
| Holdings Count | $ / shares | 441 | [6] |
| Investment Company Portfolio Turnover | 21% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $464,420,028 Total Number of Portfolio Holdings * 441 Portfolio Turnover Rate 21% | [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 Ultra-Short Income Fund | |
| Class Name | Class C1 | |
| Trading Symbol | ARMGX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to November 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 $70 1.38% | [7],[8] |
| Expenses Paid, Amount | $ 70 | |
| Expense Ratio, Percent | 1.38% | |
| Net Assets | $ 464,420,028 | |
| Holdings Count | $ / shares | 441 | [9] |
| Investment Company Portfolio Turnover | 21% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $464,420,028 Total Number of Portfolio Holdings * 441 Portfolio Turnover Rate 21% | [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 Ultra-Short Income Fund | |
| Class Name | Class I | |
| Trading Symbol | SBAYX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to November 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 $19 0.37% | [10],[11] |
| Expenses Paid, Amount | $ 19 | |
| Expense Ratio, Percent | 0.37% | |
| Net Assets | $ 464,420,028 | |
| Holdings Count | $ / shares | 441 | [12] |
| Investment Company Portfolio Turnover | 21% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $464,420,028 Total Number of Portfolio Holdings * 441 Portfolio Turnover Rate 21% | [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 Ultra-Short Income Fund | |
| Class Name | Class IS | |
| Trading Symbol | ARMLX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Ultra-Short Income Fund for the period June 1, 2024, to November 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 $17 0.34% | [13],[14] |
| Expenses Paid, Amount | $ 17 | |
| Expense Ratio, Percent | 0.34% | |
| Net Assets | $ 464,420,028 | |
| Holdings Count | $ / shares | 441 | [15] |
| Investment Company Portfolio Turnover | 21% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $464,420,028 Total Number of Portfolio Holdings * 441 Portfolio Turnover Rate 21% | [15] |
| 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. | ||
| Label | Element | Value |
| Class A | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 52.90% |
| Class A | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 16.90% |
| Class A | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13.30% |
| Class A | Mortgage-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.50% |
| Class A | U.S. Government & Agency Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.10% |
| Class A | Senior Loans [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1% |
| Class A | Sovereign Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.30% |
| Class A | Purchased Options [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0% |
| Class A | Short-Term Investments [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 9% |
| Label | Element | Value |
| Class C | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 52.90% |
| Class C | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 16.90% |
| Class C | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13.30% |
| Class C | Mortgage-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.50% |
| Class C | U.S. Government & Agency Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.10% |
| Class C | Senior Loans [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1% |
| Class C | Sovereign Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.30% |
| Class C | Purchased Options [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0% |
| Class C | Short-Term Investments [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 9% |
| Label | Element | Value |
| Class C1 | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 52.90% |
| Class C1 | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 16.90% |
| Class C1 | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13.30% |
| Class C1 | Mortgage-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.50% |
| Class C1 | U.S. Government & Agency Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.10% |
| Class C1 | Senior Loans [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1% |
| Class C1 | Sovereign Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.30% |
| Class C1 | Purchased Options [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0% |
| Class C1 | Short-Term Investments [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 9% |
| Label | Element | Value |
| Class I | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 52.90% |
| Class I | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 16.90% |
| Class I | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13.30% |
| Class I | Mortgage-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.50% |
| Class I | U.S. Government & Agency Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.10% |
| Class I | Senior Loans [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1% |
| Class I | Sovereign Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.30% |
| Class I | Purchased Options [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0% |
| Class I | Short-Term Investments [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 9% |
| Label | Element | Value |
| Class IS | Corporate Bonds & Notes [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 52.90% |
| Class IS | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 16.90% |
| Class IS | Collateralized Mortgage Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13.30% |
| Class IS | Mortgage-Backed Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.50% |
| Class IS | U.S. Government & Agency Obligations [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.10% |
| Class IS | Senior Loans [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1% |
| Class IS | Sovereign Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.30% |
| Class IS | Purchased Options [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0% |
| Class IS | Short-Term Investments [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 9% |
