v3.25.4
Form N-1A Cover
Dec. 31, 2024
Prospectus [Line Items]  
Document Type 497
Amendment Flag false
Registrant Name First Trust Exchange-Traded Fund
Entity Central Index Key 0001329377
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 2024
Prospectus Date Mar. 02, 2026