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Shareholder Report
 12 Months Ended
Sep. 30, 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 Sep. 30, 2024
Class A  
Shareholder Report [Line Items]  
Fund Name Franklin S&P 500 Index Fund
Class Name Class A
Trading Symbol SBSPX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Franklin S&P 500 Index Fund for the period October 1, 2023, to September 30, 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
$64
0.54%
[1]
Expenses Paid, Amount $ 64
Expense Ratio, Percent 0.54%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended September 30, 2024, Class A shares of Franklin S&P 500 Index Fund returned 35.60%. The Fund compares its performance to the S&P 500 Index, which returned 36.35% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
NVIDIA, a graphics, computing and networking solutions company, with its weight in the benchmark and triple-digit performance, was the top contributor. The company’s compute and networking segment, which includes AI, was its biggest revenue generator.
↑
Microsoft, a software and technology company, contributed meaningfully on consistent earnings per share and revenue beats for the period.
↑
Apple, a technology company, outperformed the benchmark as its expanding services sector, including Apple Music and Apple TV+, played a pivotal role in its revenue growth.
Top detractors from performance:
↓
Chevron, an energy and chemical company, was the top detractor considering both its weight in the benchmark and negative return, it suffered along with the Energy sector as a whole over the period.
↓
Tesla, an automotive and energy generation and storage company, only meaningfully weighted, underperformed as returns were significantly lower than the benchmark overall.
↓
Intel, a chip manufacturer, with a negative return in a positive return environment; saw its quarterly margins and guidance come in worse than expected and is pursuing major cost-cutting and restructuring initiatives.
Use of derivatives and the impact on performance:
The Fund used S&P 500 futures to manage cash flows, which modestly contributed 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 September 30, 2024
 
1 Year
5 Year
10 Year
Class A
35.60
15.39
12.76
Russell 3000 Index
35.19
15.26
12.83
S&P 500 Index
36.35
15.98
13.38
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 $ 567,725,831
Holdings Count | $ / shares 504 [2]
Advisory Fees Paid, Amount $ 962,174
Investment Company Portfolio Turnover 1.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of September 30, 2024)
Total Net Assets
$567,725,831
Total Number of Portfolio Holdings*
504
Total Management Fee Paid
$962,174
Portfolio Turnover Rate
1%
[2]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class D  
Shareholder Report [Line Items]  
Fund Name Franklin S&P 500 Index Fund
Class Name Class D
Trading Symbol SBSDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Franklin S&P 500 Index Fund for the period October 1, 2023, to September 30, 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 D
$40
0.34%
[3]
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.34%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended September 30, 2024, Class D shares of Franklin S&P 500 Index Fund returned 35.89%. The Fund compares its performance to the S&P 500 Index, which returned 36.35% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
NVIDIA, a graphics, computing and networking solutions company, with its weight in the benchmark and triple-digit performance, was the top contributor. The company’s compute and networking segment, which includes AI, was its biggest revenue generator.
↑
Microsoft, a software and technology company, contributed meaningfully on consistent earnings per share and revenue beats for the period.
↑
Apple, a technology company, outperformed the benchmark as its expanding services sector, including Apple Music and Apple TV+, played a pivotal role in its revenue growth.
Top detractors from performance:
↓
Chevron, an energy and chemical company, was the top detractor considering both its weight in the benchmark and negative return, it suffered along with the Energy sector as a whole over the period.
↓
Tesla, an automotive and energy generation and storage company, only meaningfully weighted, underperformed as returns were significantly lower than the benchmark overall.
↓
Intel, a chip manufacturer, with a negative return in a positive return environment; saw its quarterly margins and guidance come in worse than expected and is pursuing major cost-cutting and restructuring initiatives.
Use of derivatives and the impact on performance:
The Fund used S&P 500 futures to manage cash flows, which modestly contributed 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 September 30, 2024
 
1 Year
5 Year
10 Year
Class D
35.89
15.63
13.00
Russell 3000 Index
35.19
15.26
12.83
S&P 500 Index
36.35
15.98
13.38
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 $ 567,725,831
Holdings Count | $ / shares 504 [4]
Advisory Fees Paid, Amount $ 962,174
Investment Company Portfolio Turnover 1.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of September 30, 2024)
Total Net Assets
$567,725,831
Total Number of Portfolio Holdings*
504
Total Management Fee Paid
$962,174
Portfolio Turnover Rate
1%
[4]
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.