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Janus Henderson Small Cap Value Fund Annual Fund Operating Expenses - Class A C S I N R T Shares [Member] - Janus Henderson Small Cap Value Fund
Jun. 30, 2026
Class A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.54% [1]
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.24%
Expenses (as a percentage of Assets) 1.03%
Class C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.54% [1]
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.19%
Expenses (as a percentage of Assets) 1.73%
Class S  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.54% [1]
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.32%
Expenses (as a percentage of Assets) 1.11%
Class I  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.54% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.20%
Expenses (as a percentage of Assets) 0.74%
Class N  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.54% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.06%
Expenses (as a percentage of Assets) 0.60%
Class R  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.54% [1]
Distribution and Service (12b-1) Fees 0.50%
Other Expenses (as a percentage of Assets): 0.30%
Expenses (as a percentage of Assets) 1.34%
Class T  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.54% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.30%
Expenses (as a percentage of Assets) 0.84%
[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.