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Shareholder Report
 6 Months Ended
May 31, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
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 May 31, 2024
Class FI  
Shareholder Report [Line Items]  
Fund Name Franklin U.S. Large Cap Equity Fund
Class Name Class FI
Trading Symbol LMUSX
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 $10,000 investment
Costs paid as a percentage of a $10,000 investment†,*
Class FI
$58
1.05%
[1],[2]
Expenses Paid, Amount $ 58
Expense Ratio, Percent 1.05%
Net Assets $ 229,915,435
Holdings Count | $ / shares 121 [3]
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2024)
Total Net Assets
$229,915,435
Total Number of Portfolio Holdings*
121
Portfolio Turnover Rate
31%
[3]
Holdings [Text Block]
image
Class I  
Shareholder Report [Line Items]  
Fund Name Franklin U.S. Large Cap Equity Fund
Class Name Class I
Trading Symbol LMTIX
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 $10,000 investment
Costs paid as a percentage of a $10,000 investment†,*
Class I
$44
0.80%
[4],[5]
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.80%
Net Assets $ 229,915,435
Holdings Count | $ / shares 121 [6]
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2024)
Total Net Assets
$229,915,435
Total Number of Portfolio Holdings*
121
Portfolio Turnover Rate
31%
[6]
Holdings [Text Block]
image
Class IS  
Shareholder Report [Line Items]  
Fund Name Franklin U.S. Large Cap Equity Fund
Class Name Class IS
Trading Symbol LMISX
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 $10,000 investment
Costs paid as a percentage of a $10,000 investment†,*
Class IS
$39
0.70%
[7],[8]
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.70%
Net Assets $ 229,915,435
Holdings Count | $ / shares 121 [9]
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2024)
Total Net Assets
$229,915,435
Total Number of Portfolio Holdings*
121
Portfolio Turnover Rate
31%
[9]
Holdings [Text Block]
image
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
† Annualized.
[3]
* Does not include derivatives, except purchased option contracts, 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 option contracts, 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 option contracts, if any.