v3.26.1
Form N-CSR Cover
12 Months Ended
Jun. 30, 2026
Shareholder Report [Line Items]  
Document Type N-CSR/A
Amendment Flag true
Amendment Description 6/30 ammendment
Registrant Name JANUS INVESTMENT FUND
Entity Central Index Key 0000277751
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026