Janus Henderson Small Cap Value Fund Average Annual Total Returns - Class D Shares [Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Russell 3000® Index (reflects no deduction for expenses, fees, or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 17.15% | 13.15% | 14.29% |
| Russell 2000® Value Index (reflects no deduction for expenses, fees, or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 12.59% | 8.88% | 9.27% |
| Class D | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 6.61% | 6.15% | 6.40% |
| Class D | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 5.20% | 5.77% | 5.97% |
| Class D | Return Before Taxes[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.72% | 7.48% | 7.65% |