Shareholder Report |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||
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Aug. 31, 2026
USD ($)
$ / shares
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| 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 | Aug. 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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 annual shareholder report contains important information about ClearBridge Growth Fund for the period September 1, 2025, to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| 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)
|
[1] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 115 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.12% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended August 31, 2026, Class A shares of ClearBridge Growth Fund returned 5.56%. The Fund compares its performance to the Russell Midcap Growth Index, which returned -1.16% for the same period. PERFORMANCE HIGHLIGHTS
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| 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] | ![]() |
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| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended August 31, 2026
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Sep. 01, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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.
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| Net Assets | $ 4,108,565,369 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 54 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 30,345,223 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 21.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of August 31, 2026) Portfolio Composition* (% of Total Investments) ![]() |
[2] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Although the addition was not driven by a change in investment strategy, the Prospectus was amended to identify Information Technology Sector Risk as a principal risk based on the Fund’s investment concentration. Effective May 1, 2026, the Fund’s portfolio managers are Aram E. Green and Amanda Leithe, CFA. This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 877-6LM-FUND/656-3863 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | prospectus.us.franklintempleton@fisglobal.com | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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 annual shareholder report contains important information about ClearBridge Growth Fund for the period September 1, 2025, to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| 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)
|
[3] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 191 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.87% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended August 31, 2026, Class C shares of ClearBridge Growth Fund returned 4.78%. The Fund compares its performance to the Russell Midcap Growth Index, which returned -1.16% for the same period. PERFORMANCE HIGHLIGHTS
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| 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] | ![]() |
|||||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended August 31, 2026
|
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Sep. 01, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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.
|
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| Net Assets | $ 4,108,565,369 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 54 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 30,345,223 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 21.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of August 31, 2026) Portfolio Composition* (% of Total Investments) ![]() |
[4] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Although the addition was not driven by a change in investment strategy, the Prospectus was amended to identify Information Technology Sector Risk as a principal risk based on the Fund’s investment concentration. Effective May 1, 2026, the Fund’s portfolio managers are Aram E. Green and Amanda Leithe, CFA. This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 877-6LM-FUND/656-3863 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | prospectus.us.franklintempleton@fisglobal.com | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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 annual shareholder report contains important information about ClearBridge Growth Fund for the period September 1, 2025, to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| 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)
|
[5] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 119 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.16% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended August 31, 2026, Class FI shares of ClearBridge Growth Fund returned 5.51%. The Fund compares its performance to the Russell Midcap Growth Index, which returned -1.16% for the same period. PERFORMANCE HIGHLIGHTS
|
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| 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] | ![]() |
|||||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended August 31, 2026
|
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Sep. 01, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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.
|
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| Net Assets | $ 4,108,565,369 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 54 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 30,345,223 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 21.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2026)
|
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of August 31, 2026) Portfolio Composition* (% of Total Investments) ![]() |
[6] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Although the addition was not driven by a change in investment strategy, the Prospectus was amended to identify Information Technology Sector Risk as a principal risk based on the Fund’s investment concentration. Effective May 1, 2026, the Fund’s portfolio managers are Aram E. Green and Amanda Leithe, CFA. This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 877-6LM-FUND/656-3863 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | prospectus.us.franklintempleton@fisglobal.com | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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 annual shareholder report contains important information about ClearBridge Growth Fund for the period September 1, 2025, to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| 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)
|
[7] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 149 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.45% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended August 31, 2026, Class R shares of ClearBridge Growth Fund returned 5.21%. The Fund compares its performance to the Russell Midcap Growth Index, which returned -1.16% for the same period. PERFORMANCE HIGHLIGHTS
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| 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] | ![]() |
|||||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended August 31, 2026
|
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Sep. 01, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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.
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| Net Assets | $ 4,108,565,369 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 54 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 30,345,223 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 21.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of August 31, 2026) Portfolio Composition* (% of Total Investments) ![]() |
[8] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Although the addition was not driven by a change in investment strategy, the Prospectus was amended to identify Information Technology Sector Risk as a principal risk based on the Fund’s investment concentration. Effective May 1, 2026, the Fund’s portfolio managers are Aram E. Green and Amanda Leithe, CFA. This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com.
|
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 877-6LM-FUND/656-3863 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | prospectus.us.franklintempleton@fisglobal.com | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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 annual shareholder report contains important information about ClearBridge Growth Fund for the period September 1, 2025, to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| 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)
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[9] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 85 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.83% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended August 31, 2026, Class I shares of ClearBridge Growth Fund returned 5.85%. The Fund compares its performance to the Russell Midcap Growth Index, which returned -1.16% for the same period. PERFORMANCE HIGHLIGHTS
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| 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] | ![]() |
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| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended August 31, 2026
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Sep. 01, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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.
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| Net Assets | $ 4,108,565,369 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 54 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 30,345,223 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 21.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of August 31, 2026) Portfolio Composition* (% of Total Investments) ![]() |
[10] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Although the addition was not driven by a change in investment strategy, the Prospectus was amended to identify Information Technology Sector Risk as a principal risk based on the Fund’s investment concentration. Effective May 1, 2026, the Fund’s portfolio managers are Aram E. Green and Amanda Leithe, CFA. This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 877-6LM-FUND/656-3863 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | prospectus.us.franklintempleton@fisglobal.com | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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 annual shareholder report contains important information about ClearBridge Growth Fund for the period September 1, 2025, to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| 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)
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[11] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 76 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.74% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended August 31, 2026, Class IS shares of ClearBridge Growth Fund returned 5.95%. The Fund compares its performance to the Russell Midcap Growth Index, which returned -1.16% for the same period. PERFORMANCE HIGHLIGHTS
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| 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] | ![]() |
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| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended August 31, 2026
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| 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. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Sep. 01, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||
| 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.
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| Net Assets | $ 4,108,565,369 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 54 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 30,345,223 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 21.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of August 31, 2026) Portfolio Composition* (% of Total Investments) ![]() |
[12] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Although the addition was not driven by a change in investment strategy, the Prospectus was amended to identify Information Technology Sector Risk as a principal risk based on the Fund’s investment concentration. Effective May 1, 2026, the Fund’s portfolio managers are Aram E. Green and Amanda Leithe, CFA. This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com.
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since September 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or prospectus.us.franklintempleton@fisglobal.com. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 877-6LM-FUND/656-3863 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | prospectus.us.franklintempleton@fisglobal.com | |||||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |||||||||||||||||||||||||||||||||||||||||||||||||
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