Janus Henderson Global Allocation Fund - Conservative Average Annual Total Returns - Class D Shares [Member]

12 Months Ended

60 Months Ended

120 Months Ended

267 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Bloomberg Global Aggregate Bond Index (Hedged) (reflects no deduction for expenses, fees, or taxes)[Member]

Prospectus [Line Items]

Average Annual Return, Percent

4.86%

0.34%

2.39%

Global Conservative Allocation Index (Hedged) (reflects no deduction for expenses, fees, or taxes, except any applicable foreign withholding taxes)[Member]

Prospectus [Line Items]

Average Annual Return, Percent

11.65%

4.71%

6.26%

Global Conservative Allocation Index (Unhedged) (reflects no deduction for expenses, fees, or taxes, except any applicable foreign withholding taxes)[Member]

Prospectus [Line Items]

Average Annual Return, Percent

11.97%

5.78%

6.10%

Bloomberg Global Aggregate Bond Index (Unhedged) (reflects no deduction for expenses, fees, or taxes)[Member]

Prospectus [Line Items]

Average Annual Return, Percent

8.17%

(2.15%)

1.26%

2.62%

Class D | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

11.88%

1.50%

3.66%

Class D | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

7.70%

1.71%

3.49%

Class D | Return Before Taxes[Member]

Prospectus [Line Items]

Average Annual Return, Percent

12.82%

2.64%

4.81%

[1]	If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures.