v3.26.1
Form N-1A Cover
Apr. 24, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name THIRD AVENUE VARIABLE SERIES TRUST
Entity Central Index Key 0001089107
Entity Investment Company Type N-1A
Document Period End Date Apr. 24, 2026
Prospectus Date Apr. 30, 2026