v3.26.1
Form N-1A Cover
Feb. 28, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name MFS® ACTIVE EXCHANGE TRADED FUNDS TRUST
Entity Central Index Key 0002018846
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2026
Prospectus Date May 19, 2026