Janus Henderson Global Allocation Fund - Growth Expense Example, No Redemption - Class A C S I T Shares [Member] - Janus Henderson Global Allocation Fund - Growth	Jun. 30, 2025 USD ($)
Class A
Prospectus [Line Items]
Expense Example, No Redemption, 1 Year	$ 668
Expense Example, No Redemption, 3 Years	866
Expense Example, No Redemption, 5 Years	1,080
Expense Example, No Redemption, 10 Years	1,696
Class C
Prospectus [Line Items]
Expense Example, No Redemption, 1 Year	175
Expense Example, No Redemption, 3 Years	542
Expense Example, No Redemption, 5 Years	933
Expense Example, No Redemption, 10 Years	1,831
Class S
Prospectus [Line Items]
Expense Example, No Redemption, 1 Year	116
Expense Example, No Redemption, 3 Years	362
Expense Example, No Redemption, 5 Years	628
Expense Example, No Redemption, 10 Years	1,386
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 T
Prospectus [Line Items]
Expense Example, No Redemption, 1 Year	91
Expense Example, No Redemption, 3 Years	284
Expense Example, No Redemption, 5 Years	493
Expense Example, No Redemption, 10 Years	$ 1,096