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Janus Henderson Small-Mid Cap Value Fund Annual Fund Operating Expenses - Class D 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, shareholder servicing fees, out-of-pocket transfer agency/shareholder servicing costs, 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 D  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.61% [1]
Other Expenses (as a percentage of Assets): 0.49%
Expenses (as a percentage of Assets) 1.10%
Fee Waiver or Reimbursement (0.34%) [2]
Net Expenses (as a percentage of Assets) 0.76% [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, shareholder servicing fees, out-of-pocket transfer agency/shareholder servicing costs, 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.