v3.25.1
Form N-1A Cover
Sep. 30, 2024
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, 2024
Prospectus Date Jun. 09, 2025