v3.25.2
S000069099 [Member] N-1A Cover
Feb. 28, 2025
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name Legg Mason Partners Institutional Trust
Entity Central Index Key 0000889512
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2025
Prospectus Date Jul. 01, 2025