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Janus Henderson Small-Mid Cap Value Fund Annual Fund Operating Expenses - Class A C S I N T Shares [Member] - Janus Henderson Small-Mid Cap Value Fund
Jun. 30, 2026
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination <span style="font-family:Times New Roman;font-size:7.60pt;">The Adviser has contractually agreed to waive its investment advisory fee and/or reimburse operating expenses to the extent that the Fund’s total annual fund operating expenses (excluding any performance adjustments to management fees, fees payable pursuant to a Rule 12b-1 plan, shareholder servicing fees, out-of-pocket transfer agency/shareholder servicing costs, including networking/omnibus/shareholder servicing fees payable by any share class, acquired fund fees and expenses, interest, dividends, taxes, brokerage commissions, and extraordinary expenses) exceed 0.74% for at least a one-year period commencing on October 28, 2026. This fee waiver and/or reimbursement may be revised,</span><span style="font-family:Times New Roman;font-size:7.60pt;line-height:9.50pt;"> </span><span style="font-family:Times New Roman;font-size:7.60pt;">extended, or terminated only at the discretion of the Board of Trustees.</span>
Class A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.61% [1]
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.55%
Expenses (as a percentage of Assets) 1.41%
Fee Waiver or Reimbursement (0.39%) [2]
Net Expenses (as a percentage of Assets) 1.02% [2]
Class C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.61% [1]
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.88%
Expenses (as a percentage of Assets) 2.49%
Fee Waiver or Reimbursement (0.74%) [2]
Net Expenses (as a percentage of Assets) 1.75% [2]
Class S  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.61% [1]
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 2.07%
Expenses (as a percentage of Assets) 2.93%
Fee Waiver or Reimbursement (1.78%) [2]
Net Expenses (as a percentage of Assets) 1.15% [2]
Class I  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.61% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.50%
Expenses (as a percentage of Assets) 1.11%
Fee Waiver or Reimbursement (0.35%) [2]
Net Expenses (as a percentage of Assets) 0.76% [2]
Class N  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.61% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.41%
Expenses (as a percentage of Assets) 1.02%
Fee Waiver or Reimbursement (0.37%) [2]
Net Expenses (as a percentage of Assets) 0.65% [2]
Class T  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.61% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.62%
Expenses (as a percentage of Assets) 1.23%
Fee Waiver or Reimbursement (0.33%) [2]
Net Expenses (as a percentage of Assets) 0.90% [2]
[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.
[2] The Adviser has contractually agreed to waive its investment advisory fee and/or reimburse operating expenses to the extent that the Fund’s total annual fund operating expenses (excluding any performance adjustments to management fees, fees payable pursuant to a Rule 12b-1 plan, shareholder servicing fees, out-of-pocket transfer agency/shareholder servicing costs, including networking/omnibus/shareholder servicing fees payable by any share class, acquired fund fees and expenses, interest, dividends, taxes, brokerage commissions, and extraordinary expenses) exceed 0.74% for at least a one-year period commencing on October 28, 2026. This fee waiver and/or reimbursement may be revised, extended, or terminated only at the discretion of the Board of Trustees.