v3.26.1
Form N-1A Cover
Jul. 21, 2025
Prospectus [Line Items]  
Document Type 497
Amendment Flag false
Registrant Name FIRST TRUST EXCHANGE-TRADED FUND VIII
Entity Central Index Key 0001667919
Entity Investment Company Type N-1A
Document Period End Date Jul. 21, 2025
Prospectus Date Jul. 20, 2026