v3.26.1
Vanguard High-Yield Active ETF N-1A Cover
Jan. 31, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name Vanguard Fixed Income Securities Funds
Entity Central Index Key 0000106444
Entity Investment Company Type N-1A
Document Period End Date Jan. 31, 2026
Prospectus Date May 28, 2026