v3.26.1
S000016654 [Member] N-1A Cover
Jan. 31, 2026
Prospectus [Line Items]  
Document Type 485BPOS
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 Jan. 31, 2026
Prospectus Date Jun. 01, 2026