v3.26.1
S000053934 [Member] N-1A Cover
Dec. 31, 2025
Prospectus [Line Items]  
Document Type 485BPOS
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
Prospectus Date May 01, 2026