v3.26.1
S000001469 [Member] N-1A Cover
Mar. 31, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name BLACKROCK ALLOCATION TARGET SHARES
Entity Central Index Key 0001221845
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2026
Prospectus Date Jul. 29, 2026