v3.26.3
Janus Henderson Mid Cap Value Fund Expense Example - Class A C S I N R T Shares [Member] - Janus Henderson Mid Cap Value Fund
Jun. 30, 2026
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 663
Expense Example, with Redemption, 3 Years 851
Expense Example, with Redemption, 5 Years 1,055
Expense Example, with Redemption, 10 Years 1,641
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 272
Expense Example, with Redemption, 3 Years 533
Expense Example, with Redemption, 5 Years 918
Expense Example, with Redemption, 10 Years 1,793
Class S  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 107
Expense Example, with Redemption, 3 Years 334
Expense Example, with Redemption, 5 Years 579
Expense Example, with Redemption, 10 Years 1,283
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 67
Expense Example, with Redemption, 3 Years 211
Expense Example, with Redemption, 5 Years 368
Expense Example, with Redemption, 10 Years 822
Class N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 56
Expense Example, with Redemption, 3 Years 176
Expense Example, with Redemption, 5 Years 307
Expense Example, with Redemption, 10 Years 689
Class R  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 133
Expense Example, with Redemption, 3 Years 415
Expense Example, with Redemption, 5 Years 718
Expense Example, with Redemption, 10 Years 1,579
Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 82
Expense Example, with Redemption, 3 Years 255
Expense Example, with Redemption, 5 Years 444
Expense Example, with Redemption, 10 Years $ 990