v3.26.1
Form N-1A Cover
Sep. 30, 2025
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name VANGUARD MALVERN FUNDS
Entity Central Index Key 0000836906
Entity Investment Company Type N-1A
Document Period End Date Sep. 30, 2025
Prospectus Date Jun. 02, 2026