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Shareholder Report
 6 Months Ended
Mar. 31, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
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 Mar. 31, 2025
Class A  
Shareholder Report [Line Items]  
Fund Name ClearBridge Global Infrastructure Income Fund
Class Name Class A
Trading Symbol RGAVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Global Infrastructure Income Fund for the period October 1, 2024, to March 31, 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
$60
1.22%
[1],[2]
Expenses Paid, Amount $ 60
Expense Ratio, Percent 1.22%
Net Assets $ 115,712,696
Holdings Count | $ / shares 36 [3]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$115,712,696
Total Number of Portfolio Holdings*
36
Portfolio Turnover Rate
36%
[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 Global Infrastructure Income Fund
Class Name Class C
Trading Symbol CBGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Global Infrastructure Income Fund for the period October 1, 2024, to March 31, 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
2.06%
[4],[5]
Expenses Paid, Amount $ 102
Expense Ratio, Percent 2.06%
Net Assets $ 115,712,696
Holdings Count | $ / shares 36 [6]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$115,712,696
Total Number of Portfolio Holdings*
36
Portfolio Turnover Rate
36%
[6]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class I  
Shareholder Report [Line Items]  
Fund Name ClearBridge Global Infrastructure Income Fund
Class Name Class I
Trading Symbol RGIVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Global Infrastructure Income Fund for the period October 1, 2024, to March 31, 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
$48
0.96%
[7],[8]
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.96%
Net Assets $ 115,712,696
Holdings Count | $ / shares 36 [9]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$115,712,696
Total Number of Portfolio Holdings*
36
Portfolio Turnover Rate
36%
[9]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class IS  
Shareholder Report [Line Items]  
Fund Name ClearBridge Global Infrastructure Income Fund
Class Name Class IS
Trading Symbol RGSVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about ClearBridge Global Infrastructure Income Fund for the period October 1, 2024, to March 31, 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
$43
0.86%
[10],[11]
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.86%
Net Assets $ 115,712,696
Holdings Count | $ / shares 36 [12]
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of March 31, 2025)
Total Net Assets
$115,712,696
Total Number of Portfolio Holdings*
36
Portfolio Turnover Rate
36%
[12]
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.