v3.26.3
Janus Henderson Adaptive Risk Managed U.S. Equity Fund Average Annual Total Returns - Class A C S I N T Shares [Member]
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 1000® Index (reflects no deduction for expenses, fees, or taxes)[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 17.37% 13.59% 14.59%
S&P 500® Minimum Volatility IndexTR (reflects no deduction for expenses, fees, or taxes)[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 11.74% 10.27% 11.56%
Class A | Return Before Taxes[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 6.67% 9.13% 10.36%
Class C | Return Before Taxes[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent [2] 11.32% 9.73% 10.26%
Class S | Return Before Taxes[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 12.94% 10.28% 10.86%
Class I | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 10.70% 7.87% 8.91%
Class I | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 9.45% 7.54% 8.39%
Class I | Return Before Taxes[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 13.44% 10.70% 11.28%
Class N | Return Before Taxes[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 13.60% 10.83% 11.41%
Class T | Return Before Taxes[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 13.28% 10.57% 11.14%
[1] Calculated assuming maximum permitted sales loads.
[2] The one year return is calculated to include the contingent deferred sales charge.