v3.26.1
Vanguard SP Mid-Cap 400 Growth Index Fund N-1A Cover
Aug. 31, 2025
Prospectus [Line Items]  
Document Type 497
Amendment Flag false
Registrant Name VANGUARD ADMIRAL FUNDS
Entity Central Index Key 0000891190
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2025
Prospectus Date Dec. 19, 2025