v3.26.3
Janus Henderson Small Cap Value Fund Expense Example, No Redemption - Class A C S I N R T Shares [Member] - Janus Henderson Small Cap Value Fund
Jun. 30, 2026
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 674
Expense Example, No Redemption, 3 Years 884
Expense Example, No Redemption, 5 Years 1,111
Expense Example, No Redemption, 10 Years 1,762
Class C  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 176
Expense Example, No Redemption, 3 Years 545
Expense Example, No Redemption, 5 Years 939
Expense Example, No Redemption, 10 Years 1,856
Class S  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 113
Expense Example, No Redemption, 3 Years 353
Expense Example, No Redemption, 5 Years 612
Expense Example, No Redemption, 10 Years 1,352
Class I  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 76
Expense Example, No Redemption, 3 Years 237
Expense Example, No Redemption, 5 Years 411
Expense Example, No Redemption, 10 Years 918
Class N  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 61
Expense Example, No Redemption, 3 Years 192
Expense Example, No Redemption, 5 Years 335
Expense Example, No Redemption, 10 Years 750
Class R  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 136
Expense Example, No Redemption, 3 Years 425
Expense Example, No Redemption, 5 Years 734
Expense Example, No Redemption, 10 Years 1,613
Class T  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 86
Expense Example, No Redemption, 3 Years 268
Expense Example, No Redemption, 5 Years 466
Expense Example, No Redemption, 10 Years $ 1,037