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Shareholder Report
 6 Months Ended
Apr. 30, 2025
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 Apr. 30, 2025
Class A  
Shareholder Report [Line Items]  
Fund Name ClearBridge Select Fund
Class Name Class A
Trading Symbol LCLAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Select Fund for the period November 1, 2024, to April 30, 2025.
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
$65
1.33%
[1],[2]
Expenses Paid, Amount $ 65
Expense Ratio, Percent 1.33%
Net Assets $ 3,192,041,865
Holdings Count | $ / shares 88 [3]
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$3,192,041,865
Total Number of Portfolio Holdings*
88
Portfolio Turnover Rate
18%
[3]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name ClearBridge Select Fund
Class Name Class C
Trading Symbol LCLCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Select Fund for the period November 1, 2024, to April 30, 2025.
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
$102
2.08%
[4],[5]
Expenses Paid, Amount $ 102
Expense Ratio, Percent 2.08%
Net Assets $ 3,192,041,865
Holdings Count | $ / shares 88 [6]
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$3,192,041,865
Total Number of Portfolio Holdings*
88
Portfolio Turnover Rate
18%
[6]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class FI  
Shareholder Report [Line Items]  
Fund Name ClearBridge Select Fund
Class Name Class FI
Trading Symbol LCBSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Select Fund for the period November 1, 2024, to April 30, 2025.
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 FI
$67
1.36%
[7],[8]
Expenses Paid, Amount $ 67
Expense Ratio, Percent 1.36%
Net Assets $ 3,192,041,865
Holdings Count | $ / shares 88 [9]
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$3,192,041,865
Total Number of Portfolio Holdings*
88
Portfolio Turnover Rate
18%
[9]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name ClearBridge Select Fund
Class Name Class R
Trading Symbol CBSCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Select Fund for the period November 1, 2024, to April 30, 2025.
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 R
$82
1.67%
[10],[11]
Expenses Paid, Amount $ 82
Expense Ratio, Percent 1.67%
Net Assets $ 3,192,041,865
Holdings Count | $ / shares 88 [12]
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$3,192,041,865
Total Number of Portfolio Holdings*
88
Portfolio Turnover Rate
18%
[12]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name ClearBridge Select Fund
Class Name Class I
Trading Symbol LBFIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Select Fund for the period November 1, 2024, to April 30, 2025.
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
$53
1.09%
[13],[14]
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.09%
Net Assets $ 3,192,041,865
Holdings Count | $ / shares 88 [15]
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$3,192,041,865
Total Number of Portfolio Holdings*
88
Portfolio Turnover Rate
18%
[15]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class IS  
Shareholder Report [Line Items]  
Fund Name ClearBridge Select Fund
Class Name Class IS
Trading Symbol LCSSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Select Fund for the period November 1, 2024, to April 30, 2025.
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
$48
0.98%
[16],[17]
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.98%
Net Assets $ 3,192,041,865
Holdings Count | $ / shares 88 [18]
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2025)
Total Net Assets
$3,192,041,865
Total Number of Portfolio Holdings*
88
Portfolio Turnover Rate
18%
[18]
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]
† Annualized.
[3]
* Does not include derivatives, except purchased options, 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 options, 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 options, if any.
[10]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[11]
† Annualized.
[12]
* Does not include derivatives, except purchased options, if any.
[13]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[14]
† Annualized.
[15]
* Does not include derivatives, except purchased options, if any.
[16]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[17]
† Annualized.
[18]
* Does not include derivatives, except purchased options, if any.