v3.26.1
S000031362 [Member] N-1A Cover
Jan. 31, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name COLUMBIA FUNDS SERIES TRUST II
Entity Central Index Key 0001352280
Entity Investment Company Type N-1A
Document Period End Date Jan. 31, 2026
Prospectus Date Jun. 01, 2026