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Janus Henderson Mid Cap Value Fund Annual Fund Operating Expenses - Class D Shares [Member] - Janus Henderson Mid Cap Value Fund - Class D
Jun. 30, 2026
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.52% [1]
Other Expenses (as a percentage of Assets): 0.16%
Expenses (as a percentage of Assets) 0.68%
[1] This fee may adjust up or down monthly based on the Fund’s performance relative to its benchmark index over the performance measurement period. For more information regarding performance-based advisory fees, refer to “Management Expenses” in the Fund’s Prospectus.