This table describes the fees and expenses that you may pay if you buy, hold, and sell Shares of the Fund. Each share class has different expenses, but represents an investment in the same Fund. Information about eligibility requirements for each share class is available from your financial professional and in the “Purchases” section on page 21 of the Fund’s Prospectus and in the “Purchases” section on page 30 of the Fund’s Statement of Additional Information. In addition, please see Appendix A for information regarding financial intermediary-specific policies that may apply to purchases of Fund shares through certain intermediaries. You may also incur brokerage commissions charged by your broker or financial intermediary when buying Class I Shares or Class N Shares of the Fund that are not reflected in the table or in the example below.

Operating Expenses Caption [Text]

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ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

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January 31, 2024

Portfolio Turnover [Heading]

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Portfolio Turnover:

Portfolio Turnover [Text Block]

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The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. Because the Fund was not in operation during the most recent fiscal year, no portfolio turnover information is available.

Other Expenses, New Fund, Based on Estimates [Text]

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Since the Fund is new, Other Expenses are based on the estimated expenses that the Fund expects to incur in its initial fiscal period.

Expense Example [Heading]

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EXAMPLE:

Expense Example by Year [Heading]

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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 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]

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The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Strategy [Heading]

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PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

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The Fund pursues its investment objectives by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in a portfolio of dividend-paying equity securities of U.S. companies. An issuer is deemed to be economically tied to the United States if one or more of the following tests are met: (i) the issuer is organized in, or its primary business office or principal trading market of its equity is located in, the United States; (ii) a majority of the issuer’s revenues are derived from the United States; or (iii) a majority of the issuer’s assets are located in the United States.

The Fund generally invests in a core group of approximately 40‑50 equity securities, including common stocks, and real estate investment trusts (“REITs”). The Fund will invest primarily in larger, well-established companies but may also invest in mid‑ and small‑sized companies.

The portfolio manager primarily seeks to identify high-quality companies with the ability to grow revenue and cash flows and produce growing dividend streams through disparate economic environments. Such companies, in the portfolio manager’s view, have the ability to participate in market gains while offering resilient dividends. Security selection will be based upon an analysis of a broad range of metrics, including returns on invested capital, balance sheet strength, and revenue growth potential.

The Fund will generally consider selling a security when, in the portfolio manager’s opinion, there is a risk of significant deterioration in the company’s fundamentals, or there is a change in business strategy or issuer-specific business outlook that affects the original investment case. The Fund will also consider selling a security if, in the portfolio manager’s opinion, it has become overvalued or if a superior investment opportunity arises.

The Fund may lend portfolio securities on a short-term or long-term basis, in an amount equal to up to one‑third of its total assets as determined at the time of the loan origination.

Risk [Heading]

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PRINCIPAL INVESTMENT RISKS

Risk Narrative [Text Block]

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The biggest risk is that the Fund’s returns will vary, and you could lose money. The Fund is designed for long-term investors seeking an equity portfolio, including common stocks. Common stocks tend to be more volatile than many other investment choices. The principal risks associated with investing in the Fund are set forth below.

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value may fluctuate and it may be more difficult to value or sell the Fund’s holdings. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as terrorism, conflicts, including related sanctions, social unrest, natural disasters, epidemics and pandemics, including COVID‑19) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Dividend-Oriented Stocks Risk. Issuers that have paid regular dividends to shareholders may decrease or eliminate dividend payments in the future. A decrease in dividend payments by an issuer may result in a decrease in the value of the security held by the Fund or the Fund receiving less income. In addition, if issuers fail to consistently raise their dividends, the Fund may not achieve its objective.

Value Investing Risk. Because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “value” stocks may perform differently than other types of stocks and from the market as a whole, and can continue to be undervalued by the market for long periods of time. It is also possible that a value stock will never appreciate to the extent expected by the portfolio manager.

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. The Fund may underperform its benchmark index or other mutual funds with similar investment objectives.

Issuer Concentration Risk. The Fund’s portfolio may be comprised of a relatively small number of issuers in comparison to other funds. As a result, the Fund may be subject to greater risks than a fund that invests in a greater number of issuers. A change in the value of any single investment held by the Fund may affect the overall value of the Fund more than it would affect a fund that holds more investments. In particular, the Fund may be more susceptible to adverse developments affecting any single issuer in the Fund and may be susceptible to greater losses because of these developments.

Small- and Mid‑Sized Companies Risk. Investments in securities issued by small- and mid‑sized companies, which can include smaller, start‑up companies offering emerging products or services, may involve greater risks than are customarily associated with larger, more established companies. For example, while small-and mid-sized companies may realize more substantial growth than larger or more established issuers, they may also suffer more significant losses as a result of their narrow product lines, limited operating history, greater exposure to competitive threats, limited financial resources, limited trading markets, and the potential lack of management depth. Securities issued by small-and mid-sized companies tend to be more volatile and somewhat more speculative than securities issued by larger or more established companies and may underperform as compared to the securities of larger or more established companies. These holdings are also subject to wider price fluctuations and tend to be less liquid than stocks of larger or more established companies, which could have a significant adverse effect on the Fund’s returns, especially as market conditions change.

REIT Risk. REITs are subject to certain risks inherent in the direct ownership of real estate, including without limitation, a possible lack of mortgage funds and associated interest rate risks, overbuilding, property vacancies, increases in property taxes and operating expenses, changes in zoning laws, losses due to environmental damages and changes in neighborhood values and appeal to purchasers. In addition, a REIT could fail to qualify for tax‑free pass-through of its income under the Internal Revenue Code of 1986, as amended, or fail to maintain its exemption from registration under the Investment Company Act of 1940, as amended, which could produce adverse economic consequences for the REIT and its investors, including the Fund. Dividends received by the Fund from a REIT generally will not constitute qualified dividend income.

New/Smaller Sized Fund Risk. Because the Fund is new, it has a limited operating history and a small asset base. The Fund’s performance may not represent how the Fund is expected to or may perform in the long term if and when it becomes larger. If a new or smaller fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the Fund and tax consequences for investors.

Securities Lending Risk. There is the risk that when portfolio securities are lent, the securities may not be returned on a timely basis, and the Fund may experience delays and costs in recovering the security or gaining access to the collateral provided to the Fund to collateralize the loan. If the Fund is unable to recover a security on loan, the Fund may use the collateral to purchase replacement securities in the market. There is a risk that the value of the collateral could decrease below the cost of the replacement security by the time the replacement investment is made, resulting in a loss to the Fund.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

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The biggest risk is that the Fund’s returns will vary, and you could lose money.

Risk Not Insured Depository Institution [Text]

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An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

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PERFORMANCE INFORMATION

Performance Narrative [Text Block]

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The Fund does not have a full calendar year of operations. Performance information for certain periods will be included in the Fund’s first annual and/or semiannual report and will be available at janushenderson.com/allfunds or by calling 1‑800‑335‑2687.

Performance One Year or Less [Text]

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The Fund does not have a full calendar year of operations.

Performance Availability Phone [Text]

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1‑800‑335‑2687

Performance Availability Website Address [Text]

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janushenderson.com/allfunds

Janus Henderson U.S. Dividend Income Fund | Class I, N Shares | Class I

Risk/Return:

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Management Fees

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0.60%

Other Expenses

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9.65%

^[1]

Total Annual Fund Operating Expenses

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10.25%

Fee Waiver

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9.44%

^[2]

Total Annual Fund Operating Expenses After Fee Waiver

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0.81%

^[2]

1 Year

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$ 83

3 Years

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$ 2,108

Janus Henderson U.S. Dividend Income Fund | Class I, N Shares | Class N

Risk/Return:

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Management Fees

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0.60%

Other Expenses

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9.59%

^[1]

Total Annual Fund Operating Expenses

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10.19%

Fee Waiver

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9.44%

^[2]

Total Annual Fund Operating Expenses After Fee Waiver

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0.75%

^[2]

1 Year

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$ 77

3 Years

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$ 2,092

[1]

Since the Fund is new, Other Expenses are based on the estimated expenses that the Fund expects to incur in its initial fiscal period.

[2]

The Adviser has contractually agreed to waive its investment advisory fee and/or reimburse operating expenses to the extent that the Fund’s total annual fund operating expenses (excluding shareholder servicing fees, such as transfer agency fees (including out‑of‑pocket costs), administrative services fees and any networking/omnibus fees payable by any share class, brokerage commissions, interest, dividends, taxes, acquired fund fees and expenses, and extraordinary expenses) exceed 0.75% until at least January 31, 2024. The contractual waiver may be terminated or modified prior to this date only at the discretion of the Board of Trustees. For a period beginning with the Fund’s commencement of operations (December 20, 2022) and expiring on the third anniversary of the commencement of operations, or until the Fund’s assets meet the first breakpoint in the investment advisory fee schedule (0.60% of the first $2 billion of the average daily closing net asset value of the Fund), whichever occurs first, the Adviser may recover from the Fund fees and expenses previously waived or reimbursed if the Fund’s expense ratio, including recovered expenses, falls below the expense limit. There is no guarantee that the Fund’s assets will reach this asset level.