v3.26.3
Janus Henderson Small-Mid Cap Value Fund Expense Example - Class A C S I N T Shares [Member] - Janus Henderson Small-Mid Cap Value Fund
Jun. 30, 2026
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 673
Expense Example, with Redemption, 3 Years 959
Expense Example, with Redemption, 5 Years 1,267
Expense Example, with Redemption, 10 Years 2,137
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 278
Expense Example, with Redemption, 3 Years 705
Expense Example, with Redemption, 5 Years 1,259
Expense Example, with Redemption, 10 Years 2,502
Class S  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 117
Expense Example, with Redemption, 3 Years 738
Expense Example, with Redemption, 5 Years 1,386
Expense Example, with Redemption, 10 Years 3,125
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 78
Expense Example, with Redemption, 3 Years 318
Expense Example, with Redemption, 5 Years 578
Expense Example, with Redemption, 10 Years 1,320
Class N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 66
Expense Example, with Redemption, 3 Years 288
Expense Example, with Redemption, 5 Years 527
Expense Example, with Redemption, 10 Years 1,214
Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 358
Expense Example, with Redemption, 5 Years 644
Expense Example, with Redemption, 10 Years $ 1,460