Shareholder Report |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2025
USD ($)
$ / shares
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| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Document Type | N-CSR/A | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Registrant Name | Legg Mason Global Asset Management Trust | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Entity Central Index Key | 0001474103 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Document Period End Date | Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class A | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BrandywineGLOBAL - Global Opportunities Bond Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class A | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | GOBAX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BrandywineGLOBAL - Global Opportunities Bond Fund for the period January 1, 2025, to December 31, 2025. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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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[1] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 101 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.95% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended December 31, 2025, Class A shares of BrandywineGLOBAL - Global Opportunities Bond Fund returned 13.17%. The Fund compares its performance to the FTSE World Government Bond Index, which returned 7.55% for the same period. PERFORMANCE HIGHLIGHTS
Use of derivatives and the impact on performance: The Fund utilized currency forwards for hedging and alpha purposes, which contributed to performance. Bond futures were used as a duration management, hedging, and alpha source, which detracted from period.
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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 December 31, 2025
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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 | Jan. 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 | $ 1,161,821,095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 35 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,491,276 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 235.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025) Portfolio Composition* (% of Total Investments) ![]() |
[2] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective 12/31/2025, David F. Hoffman, CFA stepped down as a member of the portfolio management team. Effective 7/31/2025, Paul Mielczarski joined the team. This is a summary of a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 | BrandywineGLOBAL - Global Opportunities Bond Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class C | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | LGOCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BrandywineGLOBAL - Global Opportunities Bond Fund for the period January 1, 2025, to December 31, 2025. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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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[3] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 181 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.71% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended December 31, 2025, Class C shares of BrandywineGLOBAL - Global Opportunities Bond Fund returned 12.23%. The Fund compares its performance to the FTSE World Government Bond Index, which returned 7.55% for the same period. PERFORMANCE HIGHLIGHTS
Use of derivatives and the impact on performance: The Fund utilized currency forwards for hedging and alpha purposes, which contributed to performance. Bond futures were used as a duration management, hedging, and alpha source, which detracted from period.
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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 December 31, 2025
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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 | Jan. 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 | $ 1,161,821,095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 35 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,491,276 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 235.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025) Portfolio Composition* (% of Total Investments) ![]() |
[4] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective 12/31/2025, David F. Hoffman, CFA stepped down as a member of the portfolio management team. Effective 7/31/2025, Paul Mielczarski joined the team. This is a summary of a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 C1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BrandywineGLOBAL - Global Opportunities Bond Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class C1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | GOBCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BrandywineGLOBAL - Global Opportunities Bond Fund for the period January 1, 2025, to December 31, 2025. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 | $ 154 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 December 31, 2025, Class C1 shares of BrandywineGLOBAL - Global Opportunities Bond Fund returned 12.65%. The Fund compares its performance to the FTSE World Government Bond Index, which returned 7.55% for the same period. PERFORMANCE HIGHLIGHTS
Use of derivatives and the impact on performance: The Fund utilized currency forwards for hedging and alpha purposes, which contributed to performance. Bond futures were used as a duration management, hedging, and alpha source, which detracted from period.
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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 December 31, 2025
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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 | Jan. 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 | $ 1,161,821,095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 35 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,491,276 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 235.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025) Portfolio Composition* (% of Total Investments) ![]() |
[6] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective 12/31/2025, David F. Hoffman, CFA stepped down as a member of the portfolio management team. Effective 7/31/2025, Paul Mielczarski joined the team. This is a summary of a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 | BrandywineGLOBAL - Global Opportunities Bond Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class FI | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | GOBFX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BrandywineGLOBAL - Global Opportunities Bond Fund for the period January 1, 2025, to December 31, 2025. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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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[7] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 107 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended December 31, 2025, Class FI shares of BrandywineGLOBAL - Global Opportunities Bond Fund returned 13.10%. The Fund compares its performance to the FTSE World Government Bond Index, which returned 7.55% for the same period. PERFORMANCE HIGHLIGHTS
Use of derivatives and the impact on performance: The Fund utilized currency forwards for hedging and alpha purposes, which contributed to performance. Bond futures were used as a duration management, hedging, and alpha source, which detracted from period.
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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 December 31, 2025
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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 | Jan. 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 | $ 1,161,821,095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 35 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,491,276 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 235.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025) Portfolio Composition* (% of Total Investments) ![]() |
[8] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective 12/31/2025, David F. Hoffman, CFA stepped down as a member of the portfolio management team. Effective 7/31/2025, Paul Mielczarski joined the team. This is a summary of a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 | BrandywineGLOBAL - Global Opportunities Bond Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class R | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | LBORX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BrandywineGLOBAL - Global Opportunities Bond Fund for the period January 1, 2025, to December 31, 2025. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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)
|
[9] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 133 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.25% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended December 31, 2025, Class R shares of BrandywineGLOBAL - Global Opportunities Bond Fund returned 12.75%. The Fund compares its performance to the FTSE World Government Bond Index, which returned 7.55% for the same period. PERFORMANCE HIGHLIGHTS
Use of derivatives and the impact on performance: The Fund utilized currency forwards for hedging and alpha purposes, which contributed to performance. Bond futures were used as a duration management, hedging, and alpha source, which detracted from period.
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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 December 31, 2025
|
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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 | Jan. 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.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,161,821,095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 35 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,491,276 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 235.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025) Portfolio Composition* (% of Total Investments) ![]() |
[10] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective 12/31/2025, David F. Hoffman, CFA stepped down as a member of the portfolio management team. Effective 7/31/2025, Paul Mielczarski joined the team. This is a summary of a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 | BrandywineGLOBAL - Global Opportunities Bond Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | GOBIX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BrandywineGLOBAL - Global Opportunities Bond Fund for the period January 1, 2025, to December 31, 2025. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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)
|
[11] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 70 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.66% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended December 31, 2025, Class I shares of BrandywineGLOBAL - Global Opportunities Bond Fund returned 13.51%. The Fund compares its performance to the FTSE World Government Bond Index, which returned 7.55% for the same period. PERFORMANCE HIGHLIGHTS
Use of derivatives and the impact on performance: The Fund utilized currency forwards for hedging and alpha purposes, which contributed to performance. Bond futures were used as a duration management, hedging, and alpha source, which detracted from period.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 December 31, 2025
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 | Jan. 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.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,161,821,095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 35 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,491,276 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 235.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025) Portfolio Composition* (% of Total Investments) ![]() |
[12] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective 12/31/2025, David F. Hoffman, CFA stepped down as a member of the portfolio management team. Effective 7/31/2025, Paul Mielczarski joined the team. This is a summary of a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 | BrandywineGLOBAL - Global Opportunities Bond Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class IS | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | GOBSX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BrandywineGLOBAL - Global Opportunities Bond Fund for the period January 1, 2025, to December 31, 2025. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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)
|
[13] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 59 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.55% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended December 31, 2025, Class IS shares of BrandywineGLOBAL - Global Opportunities Bond Fund returned 13.60%. The Fund compares its performance to the FTSE World Government Bond Index, which returned 7.55% for the same period. PERFORMANCE HIGHLIGHTS
Use of derivatives and the impact on performance: The Fund utilized currency forwards for hedging and alpha purposes, which contributed to performance. Bond futures were used as a duration management, hedging, and alpha source, which detracted from period.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 December 31, 2025
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 | Jan. 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.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,161,821,095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 35 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,491,276 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 235.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025) Portfolio Composition* (% of Total Investments) ![]() |
[14] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective 12/31/2025, David F. Hoffman, CFA stepped down as a member of the portfolio management team. Effective 7/31/2025, Paul Mielczarski joined the team. This is a summary of a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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 a change and a planned change to the Fund since 1/1/2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by 5/1/2026, 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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