Janus Henderson Government Money Market Fund Fees and Expenses - Class D Shares [Member] - Janus Henderson Government Money Market Fund |
Jun. 30, 2026 |
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| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | <span style="color:#FFFFFF;font-family:Times New Roman;font-size:10.45pt;font-weight:bold;margin-left:0.0pt;text-transform:uppercase;">Fees and Expenses of the Fund</span> |
| Expense Narrative [Text Block] | This table describes the fees and expenses that you may pay if you buy, hold, and sell Shares of the Fund. |
| Operating Expenses Caption [Optional Text] | <span style="font-family:Times New Roman;font-size:8.55pt;font-weight:bold;margin-left:0.0pt;">ANNUAL FUND OPERATING EXPENSES</span><span style="font-family:Times New Roman;font-size:8.55pt;margin-left:0.0pt;">(expenses that you pay each year as a percentage of the value of your investment)</span> |
| Expense Example [Heading] | <span style="color:#000000;font-family:Times New Roman;font-size:9.50pt;font-weight:bold;">EXAMPLE:</span> |
| Expense Example by Year [Heading] | <span style="color:#000000;font-family:Times New Roman;font-size:9.50pt;">The Example assumes that you invest $10,000 in the Fund for the time periods indicated, reinvest all dividends and distributions, and then redeem all of your Shares at the end of each period. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement for the first year and the Total Annual Fund Operating Expenses thereafter. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</span> |
| Expense Example Narrative [Text Block] | The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. |