Janus Henderson High-Yield Fund Average Annual Total Returns - Class D Shares [Member]		12 Months Ended	60 Months Ended	120 Months Ended
		Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2024
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for expenses, fees, or taxes)[Member]
Prospectus [Line Items]
Average Annual Return, Percent		1.25%	(0.33%)	1.35%
Bloomberg U.S. Corporate High-Yield Bond Index (reflects no deduction for expenses, fees, or taxes)[Member]
Prospectus [Line Items]
Average Annual Return, Percent		8.19%	4.21%	5.17%
Class D | After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent		5.53%	0.45%	1.85%
Class D | After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	[1]	4.95%	1.11%	2.19%
Class D | Return Before Taxes[Member]
Prospectus [Line Items]
Average Annual Return, Percent		8.47%	2.82%	4.30%

[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.