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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName JANUS INVESTMENT FUND
Prospectus Date rr_ProspectusDate Oct. 28, 2014
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY

Janus Global Allocation Fund – Growth
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Janus Global Allocation Fund – Growth seeks total return through a primary emphasis on growth of capital with a secondary emphasis on income.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold Shares of the Fund. Each share class has different expenses, but represents an investment in the same Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES
(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption 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 rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 1, 2015
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock 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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 13% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For Class A Shares, you may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund or in other Janus mutual funds. More information about these and other discounts, as well as eligibility requirements for each share class, is available from your financial professional and in the “Purchases” section on page 52 of the Fund’s Prospectus and in the “Purchases” section of the Fund’s Statement of Additional Information.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE:
Expense Example by Year [Heading] rr_ExpenseExampleByYearHeading 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 (including the operating expenses of the underlying funds) without waivers remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following Example is based on expenses without waivers. The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If Shares are redeemed:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If Shares are not redeemed:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund seeks to achieve its investment objective by investing in other Janus mutual funds (“underlying funds”) that represent a variety of asset classes and investment styles and provide exposure to issuers that are economically tied to countries throughout the world. Through its investments in underlying funds, the Fund invests in issuers from several different countries and may, under unusual circumstances, be invested in a single country. As a result, the Fund normally will have approximately 40% of its net assets allocated to non-U.S. investments. The Fund may also have significant exposure to emerging markets.

The Fund invests in a diversified portfolio of underlying funds, resulting in an allocation of the Fund’s investments that normally provides exposure of approximately 75% to equity investments, 15% to fixed-income securities and money market instruments, and 10% to alternative investments. The target allocation and the allocation of the Fund’s assets among underlying funds are based on quantitative and qualitative analysis. Because it invests in other funds, the Fund is considered a “fund of funds.”

The Fund’s asset allocation is intended to diversify investments throughout the world among equity investments, fixed-income securities, cash equivalents, and alternative investments. The portfolio managers determine the overall composition of the Fund, oversee the investment process, and are responsible for the day-to-day management of the Fund. The portfolio managers continually monitor asset class allocations and periodically rebalance the Fund’s investments in the underlying funds. The portfolio managers also regularly review the allocation of Fund assets in the underlying funds and may modify the underlying funds’ weightings or substitute other underlying funds to emphasize and mitigate risk exposures that may arise as a result of the implementation of the allocations.

Additionally, the portfolio managers consult with a committee (the “Janus Global Allocation Committee”) to regularly review the broad market, macroeconomic conditions, and other global financial factors that may impact the Fund’s allocation of assets among the underlying funds and asset classes. The Janus Global Allocation Committee is comprised of investment professionals of Janus Capital and may also include investment professionals of Janus Capital’s affiliated investment advisers. The portfolio managers and Janus Global Allocation Committee normally meet on a quarterly basis. The portfolio managers may change the Fund’s asset class allocations, the underlying funds, an underlying fund’s asset category, or weightings among asset classes or underlying funds without prior shareholder notice.

The Fund will normally allocate approximately 75% of its investments to underlying funds that provide varying exposure to common stocks of large U.S.-based companies, small- to mid-capitalization companies, and international companies (including those with exposure to emerging markets), approximately 15% of its investments to underlying bond funds and money market instruments, and approximately 10% of its investments to underlying funds that seek returns uncorrelated with the returns of stocks and bonds by providing exposure to alternative investments and alternative investment strategies. Refer to Appendix A in this Prospectus for a brief description of the investment strategies of each of the currently available underlying funds.

When market conditions dictate a more defensive strategy, the Fund or an underlying fund may temporarily hold cash or invest its assets in temporary investments. In that case, the Fund may take positions that are inconsistent with its investment policies. As a result, the Fund may not achieve its investment objective.
Risk [Heading] rr_RiskHeading PRINCIPAL INVESTMENT RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock 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 growth of capital and, to a lesser extent, income. Investments in a portfolio with common stock and alternative investment exposure tend to be more volatile than many other investment choices.

Main Risks Associated with the Fund
Allocation Risk. The Fund’s ability to achieve its investment objective depends largely upon the portfolio managers’ allocation of assets among the underlying funds and other securities, using the optimization process (a process that utilizes quantitative analysis of a number of factors, such as historical risk, performance, fund classifications, and the relationship among underlying funds) and the judgment of the portfolio managers. You could lose money on your investment in the Fund as a result of these allocations. The Fund will typically invest in a number of different underlying funds; however, to the extent that the Fund invests a significant portion of its assets in a single underlying fund, it will be more sensitive to the risks associated with that fund and any investments in which that fund focuses.

Affiliated Fund Risk. Janus Capital has the authority to select and substitute underlying affiliated mutual funds. The fees paid to Janus Capital by some Janus mutual funds are generally higher than the fees paid to Janus Capital by the Fund or by other funds and share classes available for investment by the Fund. These conditions may create a conflict of interest when selecting underlying affiliated mutual funds and share classes for investment. Janus Capital, however, is a fiduciary to the Fund and its shareholders and is legally obligated to act in their best interest when selecting underlying affiliated mutual funds.

Main Risks Associated with the Underlying Funds and Securities
The biggest risk is that the underlying funds’ returns will vary, and you could lose money.

Market Risk. Approximately 75% of the Fund’s assets are allocated to equity investments through investments in underlying funds. The value of an underlying fund’s portfolio may decrease if the value of an individual company or security, or multiple companies or securities, in the portfolio decreases or if the portfolio managers’ belief about a company’s intrinsic worth is incorrect. Further, regardless of how well individual companies or securities perform, the value of an underlying fund’s portfolio could also decrease if there are deteriorating economic or market conditions. 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.

Growth Securities Risk. Certain underlying funds invest in companies after assessing their growth potential. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If a portfolio manager’s perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the underlying fund’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from the market as a whole and other types of securities.

Foreign Exposure Risk. Certain underlying funds may have significant exposure to foreign markets, including emerging markets, as a result of their investments in foreign securities, which can be more volatile than the U.S. markets. As a result, an underlying fund’s returns and net asset value may be affected to a large degree by fluctuations in currency exchange rates or political or economic conditions in a particular country. A market swing in one or more countries or regions where an underlying fund has invested a significant amount of its assets may have a greater effect on an underlying fund’s performance than it would in a more geographically diversified portfolio. An underlying fund’s investments in emerging market countries may involve risks greater than, or in addition to, the risks of investing in more developed countries.

Emerging Markets Risk. The risks of foreign investing mentioned above are heightened when investing in emerging markets. Emerging markets securities involve a number of additional risks, which may result from less government supervision and regulation of business and industry practices (including the potential lack of strict finance and accounting controls and standards), stock exchanges, brokers, and listed companies, making these investments potentially more volatile in price and less liquid than investments in developed securities markets, resulting in greater risk to investors. In addition, an underlying fund’s investments may be denominated in foreign currencies and therefore, changes in the value of a country’s currency compared to the U.S. dollar may affect the value of an underlying fund’s investments. To the extent that an underlying fund invests a significant portion of its assets in the securities of issuers in or companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region, which could have a negative impact on the Fund’s performance. Some of the risks of investing directly in foreign and emerging market securities may be reduced when an underlying fund invests indirectly in foreign securities through various other investment vehicles including derivatives, which also involve other risks.

Sovereign Debt Risk. An underlying fund may invest in U.S. and non-U.S. government debt securities (“sovereign debt”). Investments in U.S. sovereign debt are considered low risk. However, investments in non-U.S. sovereign debt can involve a high degree of risk, including the risk that the governmental entity that controls the repayment of sovereign debt may not be willing or able to repay the principal and/or to pay the interest on its sovereign debt in a timely manner. A sovereign debtor’s willingness or ability to satisfy its debt obligation may be affected by various factors including, but not limited to, its cash flow situation, the extent of its foreign currency reserves, the availability of foreign exchange when a payment is due, and the relative size of its debt position in relation to its economy as a whole. In the event of default, there may be limited or no legal remedies for collecting sovereign debt and there may be no bankruptcy proceedings through which the underlying fund may collect all or part of the sovereign debt that a governmental entity has not repaid. In addition, an underlying fund that invests in non-U.S. sovereign debt may be subject to currency risk.

Fixed-Income Securities Risk. Approximately 15% of the Fund’s assets are allocated to fixed-income securities through investments in underlying funds. Typically, the values of fixed-income securities change inversely with prevailing interest rates. Therefore, a fundamental risk of fixed-income securities is interest rate risk, which is the risk that the value of such securities will generally decline as prevailing interest rates rise, which may cause an underlying fund’s net asset value to likewise decrease. Due to recent events in the fixed-income markets, including the potential impact of the Federal Reserve Board tapering its quantitative easing program, an underlying fund may be subject to heightened interest rate risk as a result of a rise in interest rates. In addition, an underlying fund is subject to the risk that interest rates may exhibit increased volatility, which could cause the underlying fund’s net asset value to fluctuate more. If rising interest rates cause an underlying fund to lose enough value, the underlying fund could also face increased shareholder redemptions, which could force the underlying fund to liquidate investments at disadvantageous times or prices, therefore adversely affecting the underlying fund and the Fund. How specific fixed-income securities may react to changes in interest rates will depend on the specific characteristics of each security. Fixed-income securities are also subject to credit risk, prepayment risk, valuation risk, and liquidity risk. Credit risk is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default. Prepayment risk is the risk that during periods of falling interest rates, certain fixed-income securities with higher interest rates, such as mortgage- and asset-backed securities, may be prepaid by their issuers thereby reducing the amount of interest payments. Valuation risk is the risk that one or more of the fixed-income securities in which an underlying fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Liquidity risk is the risk that fixed-income securities may be difficult or impossible to sell at the time that an underlying fund’s portfolio managers would like or at the price the portfolio managers believe the security is currently worth.

Mortgage-Backed Securities Risk. Mortgage-backed securities are classified generally as either commercial mortgage-backed securities or residential mortgage-backed securities, each of which is subject to certain specific risks. Mortgage-backed securities tend to be more sensitive to changes in interest rates than other types of debt securities. Investments in mortgage-backed securities are subject to both extension risk, where borrowers extend the duration of their mortgages in times of rising interest rates, and prepayment risk, where borrowers pay off their mortgages sooner than expected in times of declining interest rates. These risks may reduce the Fund’s returns. In addition, investments in mortgage-backed securities, including those comprised of subprime mortgages, may be subject to a higher degree of credit risk, valuation risk, and liquidity risk than various other types of fixed-income securities.

Investment Process Risk. The proprietary mathematical investment process used by INTECH, the subadviser to certain underlying funds, may not achieve the desired results. There is a risk that INTECH’s method of assessing stocks will not result in the expected volatility or correlation characteristics. In either case, an underlying fund may not outperform its respective benchmark index, and will likely underperform its benchmark index. On an occasional basis, INTECH makes changes to its mathematical investment process that do not require shareholder notice. These changes may result in changes to the holdings, might not provide the intended results, and may adversely impact the Fund’s performance.

Value Investing Risk. Certain underlying funds invest in “value” stocks. 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.

Real Estate Securities Risk. To the extent an underlying fund holds equity and/or debt securities of real estate-related companies, the Fund may be affected by the risks associated with real estate investments. The value of securities of companies in real estate and real estate-related industries, including securities of real estate investment trusts (“REITs”), is sensitive to decreases in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, overbuilding/supply and demand, increased competition, local and general economic conditions, increases in operating costs, environmental liabilities, management skill in running a REIT, and the creditworthiness of the REIT.

Alternative Investments Allocation Risk. Approximately 10% of the Fund’s assets are allocated to alternative investments through investments in underlying funds that invest in alternative investment strategies. In connection with the Fund’s allocation to alternative investments, the Fund may invest in a Janus underlying fund, Janus Diversified Alternatives Fund, which seeks returns uncorrelated with the returns generated by investments in stocks and bonds. In addition, as part of its alternative investments allocation, the Fund may invest in Janus Global Real Estate Fund. Janus Diversified Alternatives Fund’s ability to achieve its investment objective depends largely upon the successful evaluation of the risk, potential returns, and correlation properties with respect to its investments. There is a risk that the returns provided by alternative investments may be subject to high volatility and that an underlying fund’s portfolio managers’ beliefs about the expected returns, risk and correlation properties of one or more of an underlying fund’s investments may be incorrect. There is also a risk that an underlying fund’s investments will correlate with the performance of stocks and bonds to a greater degree than anticipated. Janus Capital does not have prior experience managing the investment strategy of Janus Diversified Alternatives Fund, and there is no guarantee that the investment techniques and analysis used by the underlying fund’s portfolio managers will produce the desired results. All of these factors may negatively affect your investment in the Fund and you could lose money. Investment in the underlying funds also involves derivatives, counterparty, leverage, real estate-related, and commodity-linked investment risks.

Counterparty Risk. Certain derivative and “over-the-counter” instruments, such as swaps and forwards, are subject to the risk that the other party to a contract will not fulfill its contractual obligations.

Commodity-Linked Investments Risk. Certain underlying funds may invest in derivatives that have exposure to the commodities markets. Such exposure may subject an underlying fund to greater volatility than investments in traditional securities. The value of a commodity-linked derivative investment typically is based upon the price movements of a physical commodity (such as heating oil, livestock, or agricultural products), a commodity futures contract or commodity index, or some other readily measurable economic variable. The value of commodity-linked derivative instruments may therefore be affected by changes in overall market movements, volatility of the underlying benchmark, changes in interest rates, or other factors affecting a particular industry or commodity such as drought, floods, weather, livestock disease, embargoes, tariffs, and international economic, political, and regulatory developments.

Derivatives Risk. Certain underlying funds may invest in derivatives. Derivatives can be highly volatile and involve risks in addition to the risks of the underlying referenced securities. Gains or losses from a derivative investment can be substantially greater than the derivative’s original cost, and can therefore involve leverage. Leverage may cause an underlying fund to be more volatile than if it had not used leverage. Derivatives can be less liquid than other types of investments and entail the risk that the counterparty will default on its payment obligations.

Exchange-Traded Funds Risk. Certain underlying funds may purchase shares of exchange-traded funds (“ETFs”) to gain exposure to a particular portion of the market. ETFs are pooled investment vehicles, which may be managed or unmanaged, that generally seek to track the performance of a specific index. ETFs are traded on an exchange at market prices that may vary from the net asset value of their underlying investments. When an underlying fund invests in an ETF, in addition to directly bearing the expenses associated with its own operations, it will bear a pro rata portion of the ETF’s expenses. ETFs have certain inherent risks generally associated with investments in a portfolio of securities in which the ETF is invested, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of each unit of the ETF. ETFs also involve the risk that an active trading market for an ETF’s shares may not develop or be maintained. To the extent an underlying fund invests in fixed-income ETFs, it will be indirectly exposed to the same risks described under “Fixed-Income Securities Risk.”

Management Risk. The underlying funds are actively managed investment portfolios and are therefore subject to the risk that the investment strategies employed for the underlying funds may fail to produce the intended results. As a result, the Fund may underperform its benchmark index or other mutual funds with similar investment objectives.

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] rr_RiskLoseMoney The biggest risk is that the Fund’s returns will vary, and you could lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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] rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. Class T Shares (formerly named Class J Shares, the initial share class) of the Fund commenced operations with the Fund’s inception. Class A Shares, Class C Shares, Class S Shares, and Class I Shares of the Fund commenced operations on July 6, 2009.
  • The performance shown for Class T Shares is calculated using the fees and expenses of Class T Shares in effect during the periods shown, net of any applicable fee and expense limitations or waivers.
  • The performance shown for Class A Shares, Class C Shares, and Class S Shares for periods prior to July 6, 2009, reflects the performance of the Fund’s former Class J Shares, calculated using the fees and expenses of each respective share class, without the effect of any fee and expense limitations or waivers.
  • The performance shown for Class I Shares for periods prior to July 6, 2009, reflects the performance of the Fund’s former Class J Shares, calculated using the fees and expenses of Class J Shares, net of any applicable fee and expense limitations or waivers.
If Class A Shares, Class C Shares, Class S Shares, and Class I Shares of the Fund had been available during periods prior to July 6, 2009, the performance shown for each respective share class may have been different. The performance shown for periods following the Fund’s commencement of Class A Shares, Class C Shares, Class S Shares, and Class I Shares reflects the fees and expenses of each respective share class, net of any applicable fee and expense limitations or waivers.

The bar chart depicts the change in performance from year to year during the periods indicated. Performance information for each underlying fund is available in its prospectus and/or the most recent annual or semiannual report. The bar chart figures do not include any applicable sales charges that an investor may pay when they buy or sell Class A Shares or Class C Shares of the Fund. If sales charges were included, the returns would be lower. The table compares the Fund’s average annual returns for the periods indicated to broad-based securities market indices. The indices are not actively managed and are not available for direct investment. All figures assume reinvestment of dividends and distributions. For certain periods, the Fund’s performance reflects the effect of expense waivers. Without the effect of these expense waivers, the performance shown would have been lower.

The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janus.com/advisor/mutual-funds or by calling 1-877-335-2687.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time.

The bar chart depicts the change in performance from year to year during the periods indicated.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The table compares the Fund’s average annual returns for the periods indicated to broad-based securities market indices. The indices are not actively managed and are not available for direct investment. All figures assume reinvestment of dividends and distributions.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-877-335-2687
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress janus.com/advisor/mutual-funds
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns for Class T Shares (calendar year-end)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart figures do not include any applicable sales charges that an investor may pay when they buy or sell Class A Shares or Class C Shares of the Fund. If sales charges were included, the returns would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best Quarter:  Second Quarter 2009  18.37%          Worst Quarter:  Fourth Quarter 2008  −18.05%
Year to Date Return, Label rr_YearToDateReturnLabel The Fund’s year-to-date return as of the calendar quarter ended September 30, 2014 was 2.20%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (periods ended 12/31/13)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-deferred account, such as a 401(k) plan or an IRA.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are only shown for Class T Shares of the Fund. After-tax returns for the other classes of Shares will vary from those shown for Class T Shares due to varying sales charges (as applicable), fees, and expenses among the classes.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The Global Growth Allocation Index is an internally-calculated, hypothetical combination of unmanaged indices that combines total returns from the MSCI All Country World IndexSM (80%) and the Barclays Global Aggregate Bond Index (20%).

After-tax returns are calculated using distributions for the Fund’s Class T Shares (formerly named Class J Shares, the initial share class). After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-deferred account, such as a 401(k) plan or an IRA.

After-tax returns are only shown for Class T Shares of the Fund. After-tax returns for the other classes of Shares will vary from those shown for Class T Shares due to varying sales charges (as applicable), fees, and expenses among the classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available at janus.com/advisor/mutual-funds or by calling 1-877-335-2687.
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class A
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (load) (as a percentage of the lower of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class A
Management Fees rr_ManagementFeesOverAssets 0.05%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.16%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.17% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.17% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName
Class A Shares
1 Year rr_ExpenseExampleYear01 687
3 Years rr_ExpenseExampleYear03 925
5 Years rr_ExpenseExampleYear05 1,182
10 Years rr_ExpenseExampleYear10 1,914
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName
Class A Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 687
3 Years rr_ExpenseExampleNoRedemptionYear03 925
5 Years rr_ExpenseExampleNoRedemptionYear05 1,182
10 Years rr_ExpenseExampleNoRedemptionYear10 1,914
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class C
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lower of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class C
Management Fees rr_ManagementFeesOverAssets 0.05%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.96% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets 0.01% [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.95% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName
Class C Shares
1 Year rr_ExpenseExampleYear01 299
3 Years rr_ExpenseExampleYear03 615
5 Years rr_ExpenseExampleYear05 1,057
10 Years rr_ExpenseExampleYear10 2,285
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName
Class C Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 199
3 Years rr_ExpenseExampleNoRedemptionYear03 615
5 Years rr_ExpenseExampleNoRedemptionYear05 1,057
10 Years rr_ExpenseExampleNoRedemptionYear10 2,285
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Class S
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class S
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lower of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class S
Management Fees rr_ManagementFeesOverAssets 0.05%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.34% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.34% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName
Class S Shares
1 Year rr_ExpenseExampleYear01 136
3 Years rr_ExpenseExampleYear03 425
5 Years rr_ExpenseExampleYear05 734
10 Years rr_ExpenseExampleYear10 1,613
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName
Class S Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 136
3 Years rr_ExpenseExampleNoRedemptionYear03 425
5 Years rr_ExpenseExampleNoRedemptionYear05 734
10 Years rr_ExpenseExampleNoRedemptionYear10 1,613
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class I
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lower of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class I
Management Fees rr_ManagementFeesOverAssets 0.05%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.18%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.94% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.94% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName
Class I Shares
1 Year rr_ExpenseExampleYear01 96
3 Years rr_ExpenseExampleYear03 300
5 Years rr_ExpenseExampleYear05 520
10 Years rr_ExpenseExampleYear10 1,155
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName
Class I Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 96
3 Years rr_ExpenseExampleNoRedemptionYear03 300
5 Years rr_ExpenseExampleNoRedemptionYear05 520
10 Years rr_ExpenseExampleNoRedemptionYear10 1,155
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class T
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lower of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class T
Management Fees rr_ManagementFeesOverAssets 0.05%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.09% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.09% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName
Class T Shares
1 Year rr_ExpenseExampleYear01 111
3 Years rr_ExpenseExampleYear03 347
5 Years rr_ExpenseExampleYear05 601
10 Years rr_ExpenseExampleYear10 1,329
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName
Class T Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 111
3 Years rr_ExpenseExampleNoRedemptionYear03 347
5 Years rr_ExpenseExampleNoRedemptionYear05 601
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,329
2006 rr_AnnualReturn2006 18.51%
2007 rr_AnnualReturn2007 15.73%
2008 rr_AnnualReturn2008 (34.91%)
2009 rr_AnnualReturn2009 35.79%
2010 rr_AnnualReturn2010 13.40%
2011 rr_AnnualReturn2011 (6.49%)
2012 rr_AnnualReturn2012 14.79%
2013 rr_AnnualReturn2013 19.56%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2014
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.20%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.05%)
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Return Before Taxes | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class A Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes [2]
1 Year rr_AverageAnnualReturnYear01 12.53%
5 Years rr_AverageAnnualReturnYear05 13.13%
Since Inception rr_AverageAnnualReturnSinceInception 6.42%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Return Before Taxes | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class C Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes [3]
1 Year rr_AverageAnnualReturnYear01 17.49%
5 Years rr_AverageAnnualReturnYear05 13.57%
Since Inception rr_AverageAnnualReturnSinceInception 6.39%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Return Before Taxes | Class S
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class S Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.28%
5 Years rr_AverageAnnualReturnYear05 14.27%
Since Inception rr_AverageAnnualReturnSinceInception 6.99%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Return Before Taxes | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class I Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.66%
5 Years rr_AverageAnnualReturnYear05 14.60%
Since Inception rr_AverageAnnualReturnSinceInception 7.35%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Return Before Taxes | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class T Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.56%
5 Years rr_AverageAnnualReturnYear05 14.60%
Since Inception rr_AverageAnnualReturnSinceInception 7.35%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Return After Taxes on Distributions | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class T Shares
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 18.43%
5 Years rr_AverageAnnualReturnYear05 13.98%
Since Inception rr_AverageAnnualReturnSinceInception 6.70%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Return After Taxes on Distributions and Sale of Fund Shares | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class T Shares
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 11.70%
5 Years rr_AverageAnnualReturnYear05 11.64%
Since Inception rr_AverageAnnualReturnSinceInception 5.73%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | MSCI All Country World Index℠ (reflects no deduction for expenses, fees, or taxes, except foreign withholding taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI All Country World IndexSM
1 Year rr_AverageAnnualReturnYear01 22.80%
5 Years rr_AverageAnnualReturnYear05 14.92%
Since Inception rr_AverageAnnualReturnSinceInception 5.75%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Janus Global Allocation Fund - Growth | Class A, C, S, I, T Shares | Global Growth Allocation Index (reflects no deduction for expenses, fees, or taxes, except any applicable foreign withholding taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Global Growth Allocation Index
1 Year rr_AverageAnnualReturnYear01 17.32%
5 Years rr_AverageAnnualReturnYear05 12.83%
Since Inception rr_AverageAnnualReturnSinceInception 5.84%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
[1] Janus Capital has contractually agreed to waive its investment advisory fee and/or reimburse Fund expenses to the extent that the Fund’s total annual fund operating expenses (excluding any expenses of an underlying fund (acquired fund fees and expenses), the distribution and shareholder servicing fees – applicable to Class A Shares, Class C Shares, and Class S Shares; administrative services fees payable pursuant to the Transfer Agency Agreement; brokerage commissions; interest; dividends; taxes; and extraordinary expenses) exceed 0.14% until at least November 1, 2015. The contractual waiver may be terminated or modified prior to this date only at the discretion of the Board of Trustees.
[2] Calculated assuming maximum permitted sales loads.
[3] The one year return is calculated to include the contingent deferred sales charge.