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Shareholder Report
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Legg Mason Partners Investment Trust
Entity Central Index Key 0000880366
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 2024
Class A  
Shareholder Report [Line Items]  
Fund Name BrandywineGLOBAL - High Yield Fund
Class Name Class A
Trading Symbol BGHAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BrandywineGLOBAL - High Yield Fund for the period January 1, 2024, to December 31, 2024.
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
$92
0.88%
[1]
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.88%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended December 31, 2024, Class A shares of BrandywineGLOBAL - High Yield Fund returned 9.45%. The Fund compares its performance to the ICE BofA U.S. High Yield Index, which returned 8.20% for the same period.  
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Selection in financial services, focused on non-bank issuers, with an overweight allocation relative to the index.
↑
Selection in energy and consumer goods, driven by active involvement with management around corporate restructuring and consolidation.
↑
Avoided large structures in the media sector that had been laggards.
Top detractors from performance:
↓
Underweight exposure to CCC-rated bonds & below credit rating, particularly in telecom, which benefited from interest rate cuts, expectations of a soft landing, and high carry.
↓
Duration positioning during a period of elevated interest rate volatility, where yields moved significantly up and down.
↓
Underweight exposure to health care.
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 December 31, 2024
 
1 Year
5 Year
10 Year
Class A
9.45
6.20
7.03
Class A (with sales charge)
5.38
5.45
6.65
Bloomberg U.S. Aggregate Index
1.25
-0.33
1.35
ICE BofA U.S. High Yield Index
8.20
4.04
5.08
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 $ 3,083,322,163
Holdings Count | $ / shares 198 [2]
Advisory Fees Paid, Amount $ 11,536,860
Investment Company Portfolio Turnover 93.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2024)
Total Net Assets
$3,083,322,163
Total Number of Portfolio Holdings*
198
Total Management Fee Paid
$11,536,860
Portfolio Turnover Rate
93%
[2]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name BrandywineGLOBAL - High Yield Fund
Class Name Class C
Trading Symbol BGHCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BrandywineGLOBAL - High Yield Fund for the period January 1, 2024, to December 31, 2024.
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
$167
1.60%
[3]
Expenses Paid, Amount $ 167
Expense Ratio, Percent 1.60%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended December 31, 2024, Class C shares of BrandywineGLOBAL - High Yield Fund returned 8.68%. The Fund compares its performance to the ICE BofA U.S. High Yield Index, which returned 8.20% for the same period.  
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Selection in financial services, focused on non-bank issuers, with an overweight allocation relative to the index.
↑
Selection in energy and consumer goods, driven by active involvement with management around corporate restructuring and consolidation.
↑
Avoided large structures in the media sector that had been laggards.
Top detractors from performance:
↓
Underweight exposure to CCC-rated bonds & below credit rating, particularly in telecom, which benefited from interest rate cuts, expectations of a soft landing, and high carry.
↓
Duration positioning during a period of elevated interest rate volatility, where yields moved significantly up and down.
↓
Underweight exposure to health care.
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 December 31, 2024
 
1 Year
Since Inception
(8/2/2021)
Class C
8.68
3.24
Class C (with sales charge)
7.68
3.24
Bloomberg U.S. Aggregate Index
1.25
-2.49
ICE BofA U.S. High Yield Index
8.20
2.92
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 $ 3,083,322,163
Holdings Count | $ / shares 198 [4]
Advisory Fees Paid, Amount $ 11,536,860
Investment Company Portfolio Turnover 93.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2024)
Total Net Assets
$3,083,322,163
Total Number of Portfolio Holdings*
198
Total Management Fee Paid
$11,536,860
Portfolio Turnover Rate
93%
[4]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name BrandywineGLOBAL - High Yield Fund
Class Name Class I
Trading Symbol BGHIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BrandywineGLOBAL - High Yield Fund for the period January 1, 2024, to December 31, 2024.
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
$67
0.64%
[5]
Expenses Paid, Amount $ 67
Expense Ratio, Percent 0.64%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended December 31, 2024, Class I shares of BrandywineGLOBAL - High Yield Fund returned 9.60%. The Fund compares its performance to the ICE BofA U.S. High Yield Index, which returned 8.20% for the same period.  
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Selection in financial services, focused on non-bank issuers, with an overweight allocation relative to the index.
↑
Selection in energy and consumer goods, driven by active involvement with management around corporate restructuring and consolidation.
↑
Avoided large structures in the media sector that had been laggards.
Top detractors from performance:
↓
Underweight exposure to CCC-rated bonds & below credit rating, particularly in telecom, which benefited from interest rate cuts, expectations of a soft landing, and high carry.
↓
Duration positioning during a period of elevated interest rate volatility, where yields moved significantly up and down.
↓
Underweight exposure to health care.
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 December 31, 2024
 
1 Year
5 Year
10 Year
Class I
9.60
6.47
7.32
Bloomberg U.S. Aggregate Index
1.25
-0.33
1.35
ICE BofA U.S. High Yield Index
8.20
4.04
5.08
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 $ 3,083,322,163
Holdings Count | $ / shares 198 [6]
Advisory Fees Paid, Amount $ 11,536,860
Investment Company Portfolio Turnover 93.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2024)
Total Net Assets
$3,083,322,163
Total Number of Portfolio Holdings*
198
Total Management Fee Paid
$11,536,860
Portfolio Turnover Rate
93%
[6]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class IS  
Shareholder Report [Line Items]  
Fund Name BrandywineGLOBAL - High Yield Fund
Class Name Class IS
Trading Symbol BGHSX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BrandywineGLOBAL - High Yield Fund for the period January 1, 2024, to December 31, 2024.
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 IS
$56
0.53%
[7]
Expenses Paid, Amount $ 56
Expense Ratio, Percent 0.53%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended December 31, 2024, Class IS shares of BrandywineGLOBAL - High Yield Fund returned 9.71%. The Fund compares its performance to the ICE BofA U.S. High Yield Index, which returned 8.20% for the same period.  
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Selection in financial services, focused on non-bank issuers, with an overweight allocation relative to the index.
↑
Selection in energy and consumer goods, driven by active involvement with management around corporate restructuring and consolidation.
↑
Avoided large structures in the media sector that had been laggards.
Top detractors from performance:
↓
Underweight exposure to CCC-rated bonds & below credit rating, particularly in telecom, which benefited from interest rate cuts, expectations of a soft landing, and high carry.
↓
Duration positioning during a period of elevated interest rate volatility, where yields moved significantly up and down.
↓
Underweight exposure to health care.
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 December 31, 2024
 
1 Year
5 Year
10 Year
Class IS
9.71
6.61
7.45
Bloomberg U.S. Aggregate Index
1.25
-0.33
1.35
ICE BofA U.S. High Yield Index
8.20
4.04
5.08
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 $ 3,083,322,163
Holdings Count | $ / shares 198 [8]
Advisory Fees Paid, Amount $ 11,536,860
Investment Company Portfolio Turnover 93.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2024)
Total Net Assets
$3,083,322,163
Total Number of Portfolio Holdings*
198
Total Management Fee Paid
$11,536,860
Portfolio Turnover Rate
93%
[8]
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.
[7]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[8]
* Does not include derivatives, except purchased options, if any.