v3.25.1
Form N-1A Cover
Apr. 30, 2025
Prospectus [Line Items]  
Document Creation Date Apr. 30, 2025
Document Effective Date Apr. 30, 2025
Document Type 485BPOS
Amendment Flag false
Registrant Name GAMCO GLOBAL SERIES FUNDS, INC.
Entity Central Index Key 0000909504
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2025
Prospectus Date Apr. 30, 2025