v3.26.1
Form N-1A Cover
Sep. 30, 2025
Prospectus [Line Items]  
Document Type 497
Amendment Flag false
Registrant Name LOOMIS SAYLES FUNDS II
Entity Central Index Key 0000872649
Entity Investment Company Type N-1A
Document Period End Date Sep. 30, 2025
Prospectus Date Feb. 01, 2026