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Shareholder Report
 6 Months Ended
Feb. 28, 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 Feb. 28, 2025
Class A  
Shareholder Report [Line Items]  
Fund Name ClearBridge Growth Fund
Class Name Class A
Trading Symbol SHRAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Growth Fund (previously known as ClearBridge Aggressive Growth Fund) for the period  September 1, 2024, to February 28, 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
$58
1.13%
[1],[2]
Expenses Paid, Amount $ 58
Expense Ratio, Percent 1.13%
Net Assets $ 4,257,346,117
Holdings Count | $ / shares 51 [3]
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$4,257,346,117
Total Number of Portfolio Holdings*
51
Portfolio Turnover Rate
13%
[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 Growth Fund
Class Name Class C
Trading Symbol SAGCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Growth Fund (previously known as ClearBridge Aggressive Growth Fund) for the period  September 1, 2024, to February 28, 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
$96
1.88%
[4],[5]
Expenses Paid, Amount $ 96
Expense Ratio, Percent 1.88%
Net Assets $ 4,257,346,117
Holdings Count | $ / shares 51 [6]
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$4,257,346,117
Total Number of Portfolio Holdings*
51
Portfolio Turnover Rate
13%
[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 Growth Fund
Class Name Class FI
Trading Symbol LMPFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Growth Fund (previously known as ClearBridge Aggressive Growth Fund) for the period  September 1, 2024, to February 28, 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
$58
1.14%
[7],[8]
Expenses Paid, Amount $ 58
Expense Ratio, Percent 1.14%
Net Assets $ 4,257,346,117
Holdings Count | $ / shares 51 [9]
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$4,257,346,117
Total Number of Portfolio Holdings*
51
Portfolio Turnover Rate
13%
[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 Growth Fund
Class Name Class R
Trading Symbol LMPRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Growth Fund (previously known as ClearBridge Aggressive Growth Fund) for the period  September 1, 2024, to February 28, 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
$74
1.44%
[10],[11]
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.44%
Net Assets $ 4,257,346,117
Holdings Count | $ / shares 51 [12]
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$4,257,346,117
Total Number of Portfolio Holdings*
51
Portfolio Turnover Rate
13%
[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 Growth Fund
Class Name Class I
Trading Symbol SAGYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Growth Fund (previously known as ClearBridge Aggressive Growth Fund) for the period  September 1, 2024, to February 28, 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
$43
0.84%
[13],[14]
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.84%
Net Assets $ 4,257,346,117
Holdings Count | $ / shares 51 [15]
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$4,257,346,117
Total Number of Portfolio Holdings*
51
Portfolio Turnover Rate
13%
[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 Growth Fund
Class Name Class IS
Trading Symbol LSIFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Growth Fund (previously known as ClearBridge Aggressive Growth Fund) for the period  September 1, 2024, to February 28, 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
$38
0.74%
[16],[17]
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.74%
Net Assets $ 4,257,346,117
Holdings Count | $ / shares 51 [18]
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$4,257,346,117
Total Number of Portfolio Holdings*
51
Portfolio Turnover Rate
13%
[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.