Fees and Expenses - Janus Henderson Low Duration Multi-Sector Income Fund	Jun. 30, 2025
Class A C S I N R T Shares [Member]
Prospectus [Line Items]
Expenses Restated to Reflect Current [Text]	Management Fees restated to reflect current fees, effective March 4, 2026. Total Annual Fund Operating Expenses restated to reflect current fees, effective March 30, 2026.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	“Acquired Fund” refers to any underlying fund (including, but not limited to, exchange-traded funds) in which the Fund invests or has invested during the period. Acquired fund fees and expenses are indirect expenses the Fund incurs as a result of investing in shares of an underlying fund. The Fund’s “Total Annual Fund Operating Expenses” may not correlate to the “Ratio of gross expenses to average net assets” presented in the Financial Highlights table because that ratio includes only the direct operating expenses incurred by the Fund, not the indirect costs of investing in Acquired Funds.
Operating Expenses Caption [Optional Text]	ANNUAL FUND OPERATING EXPENSES(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading]	EXAMPLE:
Expense Example by Year [Heading]	The Example assumes that you invest $10,000 in the Fund for the time periods indicated and reinvest all dividends and distributions. 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 Operation Expenses thereafter. Class C Shares automatically convert to Class A Shares after eight years. The Example for Class C Shares for the ten‑year period reflects the conversion to Class A Shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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 funds.
Class D Shares [Member]
Prospectus [Line Items]
Expenses Restated to Reflect Current [Text]	Management Fees restated to reflect current fees, effective March 4, 2026. Total Annual Fund Operating Expenses restated to reflect current fees, effective March 30, 2026.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	“Acquired Fund” refers to any underlying fund (including, but not limited to, exchange-traded funds) in which the Fund invests or has invested during the period. Acquired fund fees and expenses are indirect expenses the Fund incurs as a result of investing in shares of an underlying fund. The Fund’s “Total Annual Fund Operating Expenses” may not correlate to the “Ratio of gross expenses to average net assets” presented in the Financial Highlights table because that ratio includes only the direct operating expenses incurred by the Fund, not the indirect costs of investing in Acquired Funds.
Operating Expenses Caption [Optional Text]	ANNUAL FUND OPERATING EXPENSES(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading]	EXAMPLE:
Expense Example by Year [Heading]	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:
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 funds.