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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName JANUS INVESTMENT FUND
Prospectus Date rr_ProspectusDate Oct. 28, 2015
Perkins Select Value Fund | Class A, C, S, I, N, T Shares  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY

Perkins Select Value Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Perkins Select Value Fund seeks capital appreciation.
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, 2016
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 54% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 54.00%
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 66 of the Fund’s Prospectus and in the “Purchases” section on page 81 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 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 pursues its investment objective by investing primarily in common stocks in all capitalization ranges selected for their capital appreciation potential. The Fund primarily invests in the common stocks of companies of any size whose stock prices the portfolio managers believe to be undervalued. The Fund may also invest in foreign securities, which may include investments in emerging markets. In addition, when the portfolio managers believe that market conditions are unfavorable for investing, or when they are otherwise unable to locate attractive investment opportunities, the Fund’s cash or similar investments may increase.

The Fund focuses on companies that have fallen out of favor with the market or that appear to be temporarily misunderstood by the investment community. The Fund’s portfolio managers generally look for companies with:
  • strong balance sheets and solid recurring free cash flows
  • attractive relative and absolute valuation ratios or that have underperformed recently
  • favorable reward to risk characteristics
The Fund may invest its assets in derivatives, which are instruments that have a value derived from, or directly linked to, an underlying asset, such as equity securities, fixed-income securities, commodities, currencies, interest rates, or market indices, as substitutes for securities in which the Fund invests. The Fund may invest in derivative instruments (by taking long and/or short positions) for different purposes, including hedging (to offset risks associated with an investment, currency exposure, or market conditions) and to earn income and enhance returns.
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 an equity portfolio, including common stocks. Common stocks tend to be more volatile than many other investment choices.

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 managers. When the Fund’s investments in cash, cash equivalents, or similar investments increase due to a lack of favorable investment opportunities or other extraordinary factors, the Fund may not participate in market advances or declines to the same extent that it would if the Fund had been fully invested. The Fund may invest in securities such as repurchase agreements and other short-term debt obligations to generate return on its cash position.

Market Risk. The value of the 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 the 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. Market risk may affect a single issuer, industry, economic sector, or the market as a whole.

Foreign Exposure Risk. The Fund may have exposure to foreign markets as a result of its investments in foreign securities, including investments in emerging markets, which can be more volatile than the U.S. markets. As a result, its 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. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. Additionally, investments in securities of foreign governments involve the risk that a foreign government may not be willing or able to pay interest or repay principal when due. The Fund’s investments in emerging market countries may involve risks greater than, or in addition to, the risks of investing in more developed countries.

Real Estate Securities Risk. The Fund’s performance may be affected by the risks associated with investments in real estate-related companies. The value of real estate-related companies’ securities is sensitive to changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, supply and demand, and the management skill and creditworthiness of the company. Investments in real estate investment trusts (“REITs”) involve the same risks as other real estate investments. In addition, a REIT could fail to qualify for tax-free pass-through of its income under the Internal Revenue Code 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.

Derivatives Risk. 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 the 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.

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.

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 A Shares, Class C Shares, Class S Shares, Class I Shares, and Class T Shares of the Fund commenced operations with the Fund’s inception.
  • The performance shown for Class A Shares, Class C Shares, Class S Shares, Class I Shares, and Class T Shares is calculated using the fees and expenses of each respective share class, net of any applicable fee and expense limitations or waivers.
  • The performance shown for Class N Shares reflects the performance of the Fund’s Class I Shares, calculated using the fees and expenses of Class N Shares, without the effect of any fee and expense limitations or waivers. If Class N Shares of the Fund had been available during the periods shown, the performance may have been different.
The bar chart depicts the change in performance from year to year during the periods indicated. 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 a broad-based securities market index. The index is not actively managed and is 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 a broad-based securities market index. The index is not actively managed and is 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 I 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:  1st Quarter 2012  11.14%          Worst Quarter:  2nd Quarter 2012  −4.75%
Year to Date Return, Label rr_YearToDateReturnLabel The Fund’s year-to-date return as of the calendar quarter ended September 30, 2015 was −4.32%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (periods ended 12/31/14)
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 I Shares of the Fund. After-tax returns for the other classes of Shares will vary from those shown for Class I Shares due to varying sales charges (as applicable), fees, and expenses among the classes.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The Russell 3000® Value Index measures the performance of those Russell 3000® companies with lower price-to-book ratios and lower forecasted growth values. This index is used to calculate the performance fee adjustment.

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 I Shares of the Fund. After-tax returns for the other classes of Shares will vary from those shown for Class I 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.
Perkins Select Value Fund | Class A, C, S, I, N, 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 (may adjust up or down) rr_ManagementFeesOverAssets 0.56%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.35%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.16% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets 0.15% [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.01% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class A Shares
1 Year rr_ExpenseExampleYear01 $ 686
3 Years rr_ExpenseExampleYear03 922
5 Years rr_ExpenseExampleYear05 1,177
10 Years rr_ExpenseExampleYear10 $ 1,903
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class A Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 686
3 Years rr_ExpenseExampleNoRedemptionYear03 922
5 Years rr_ExpenseExampleNoRedemptionYear05 1,177
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,903
Perkins Select Value Fund | Class A, C, S, I, N, 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 (may adjust up or down) rr_ManagementFeesOverAssets 0.56%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.96% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets 0.15% [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.81% [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
Perkins Select Value Fund | Class A, C, S, I, N, 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 (may adjust up or down) rr_ManagementFeesOverAssets 0.56%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.42%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.23% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets 0.10% [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.13% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class S Shares
1 Year rr_ExpenseExampleYear01 $ 125
3 Years rr_ExpenseExampleYear03 390
5 Years rr_ExpenseExampleYear05 676
10 Years rr_ExpenseExampleYear10 $ 1,489
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class S Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 125
3 Years rr_ExpenseExampleNoRedemptionYear03 390
5 Years rr_ExpenseExampleNoRedemptionYear05 676
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,489
Perkins Select Value Fund | Class A, C, S, I, N, 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 (may adjust up or down) rr_ManagementFeesOverAssets 0.56%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets 0.14% [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.70% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class I Shares
1 Year rr_ExpenseExampleYear01 $ 86
3 Years rr_ExpenseExampleYear03 268
5 Years rr_ExpenseExampleYear05 466
10 Years rr_ExpenseExampleYear10 $ 1,037
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class I Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 86
3 Years rr_ExpenseExampleNoRedemptionYear03 268
5 Years rr_ExpenseExampleNoRedemptionYear05 466
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,037
2012 rr_AnnualReturn2012 12.48%
2013 rr_AnnualReturn2013 23.08%
2014 rr_AnnualReturn2014 7.42%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (4.32%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:  
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.14%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:  
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2012
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.75%)
Perkins Select Value Fund | Class A, C, S, I, N, T Shares | Class N  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class N
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 N
Management Fees (may adjust up or down) rr_ManagementFeesOverAssets 0.56%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.21% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.77% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets 0.14% [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.63% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class N Shares
1 Year rr_ExpenseExampleYear01 $ 79
3 Years rr_ExpenseExampleYear03 246
5 Years rr_ExpenseExampleYear05 428
10 Years rr_ExpenseExampleYear10 $ 954
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class N Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 79
3 Years rr_ExpenseExampleNoRedemptionYear03 246
5 Years rr_ExpenseExampleNoRedemptionYear05 428
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 954
Perkins Select Value Fund | Class A, C, S, I, N, 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 (may adjust up or down) rr_ManagementFeesOverAssets 0.56%
Distribution/Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.45%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.01% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets 0.12% [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.89% [1]
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class T Shares
1 Year rr_ExpenseExampleYear01 $ 103
3 Years rr_ExpenseExampleYear03 322
5 Years rr_ExpenseExampleYear05 558
10 Years rr_ExpenseExampleYear10 $ 1,236
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class T Shares
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 103
3 Years rr_ExpenseExampleNoRedemptionYear03 322
5 Years rr_ExpenseExampleNoRedemptionYear05 558
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,236
Perkins Select Value Fund | Class A, C, S, I, N, T Shares | Return Before Taxes | Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class A Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes [3]
1 Year rr_AverageAnnualReturnYear01 0.83%
Since Inception rr_AverageAnnualReturnSinceInception 12.16%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, T Shares | Return Before Taxes | Class C  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class C Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes [4]
1 Year rr_AverageAnnualReturnYear01 5.20%
Since Inception rr_AverageAnnualReturnSinceInception 13.51%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, 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 7.02%
Since Inception rr_AverageAnnualReturnSinceInception 14.13%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, 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 7.42%
Since Inception rr_AverageAnnualReturnSinceInception 14.78%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, T Shares | Return Before Taxes | Class N  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class N Shares
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 7.33%
Since Inception rr_AverageAnnualReturnSinceInception 14.45%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, 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 7.15%
Since Inception rr_AverageAnnualReturnSinceInception 14.48%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, T Shares | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class I Shares
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 5.54%
Since Inception rr_AverageAnnualReturnSinceInception 12.43%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, T Shares | Return After Taxes on Distributions and Sale of Fund Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class I Shares
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.19%
Since Inception rr_AverageAnnualReturnSinceInception 10.95%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
Perkins Select Value Fund | Class A, C, S, I, N, T Shares | Russell 3000® Value Index (reflects no deduction for expenses, fees, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 3000® Value Index
1 Year rr_AverageAnnualReturnYear01 12.70%
Since Inception rr_AverageAnnualReturnSinceInception 21.96%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 15, 2011
[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 performance adjustments to management fees, 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; acquired fund fees and expenses; and extraordinary expenses) exceed 0.77% until at least November 1, 2016. The contractual waiver may be terminated or modified prior to this date only at the discretion of the Board of Trustees.
[2] Other Expenses for Class N Shares are based on the estimated annualized expenses that the Shares expect to incur.
[3] Calculated assuming maximum permitted sales loads.
[4] The one year return is calculated to include the contingent deferred sales charge.