3.3.0.814 html 478 114 1 true 219 0 false 2 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.janus.com/role/DocumentDocumentandEntityInformationElements Document and Entity Information 1 false true R2.htm 000011 - Document - Risk/Return Summary {Unlabeled} - Janus Diversified Alternatives Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusDiversifiedAlternativesFundClassACSINTShares Risk/Return Summary- Janus Diversified Alternatives Fund (Class A, C, S, I, N, T Shares) 2 false false R9.htm 000019 - Disclosure - Risk/Return Detail Data {Elements} - Janus Diversified Alternatives Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusDiversifiedAlternativesFundClassACSINTShares Risk/Return Detail Data- Janus Diversified Alternatives Fund (Class A, C, S, I, N, T Shares) 3 false true R10.htm 000021 - Document - Risk/Return Summary {Unlabeled} - Janus Diversified Alternatives Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusDiversifiedAlternativesFundClassDShares Risk/Return Summary- Janus Diversified Alternatives Fund (Class D Shares) 4 false false R15.htm 000029 - Disclosure - Risk/Return Detail Data {Elements} - Janus Diversified Alternatives Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusDiversifiedAlternativesFundClassDShares Risk/Return Detail Data- Janus Diversified Alternatives Fund (Class D Shares) 5 false true R16.htm 000031 - Document - Risk/Return Summary {Unlabeled} - Janus Global Allocation Fund - Conservative (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalAllocationFundConservativeClassACSITShares Risk/Return Summary- Janus Global Allocation Fund - Conservative (Class A, C, S, I, T Shares) 6 false false R23.htm 000039 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Allocation Fund - Conservative (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalAllocationFundConservativeClassACSITShares Risk/Return Detail Data- Janus Global Allocation Fund - Conservative (Class A, C, S, I, T Shares) 7 false true R24.htm 000041 - Document - Risk/Return Summary {Unlabeled} - Janus Global Allocation Fund - Moderate (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalAllocationFundModerateClassACSITShares Risk/Return Summary- Janus Global Allocation Fund - Moderate (Class A, C, S, I, T Shares) 8 false false R31.htm 000049 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Allocation Fund - Moderate (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalAllocationFundModerateClassACSITShares Risk/Return Detail Data- Janus Global Allocation Fund - Moderate (Class A, C, S, I, T Shares) 9 false true R32.htm 000051 - Document - Risk/Return Summary {Unlabeled} - Janus Global Allocation Fund - Growth (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalAllocationFundGrowthClassACSITShares Risk/Return Summary- Janus Global Allocation Fund - Growth (Class A, C, S, I, T Shares) 10 false false R39.htm 000059 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Allocation Fund - Growth (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalAllocationFundGrowthClassACSITShares Risk/Return Detail Data- Janus Global Allocation Fund - Growth (Class A, C, S, I, T Shares) 11 false true R40.htm 000061 - Document - Risk/Return Summary {Unlabeled} - Janus Global Allocation Fund - Conservative (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalAllocationFundConservativeClassDShares Risk/Return Summary- Janus Global Allocation Fund - Conservative (Class D Shares) 12 false false R45.htm 000069 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Allocation Fund - Conservative (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalAllocationFundConservativeClassDShares Risk/Return Detail Data- Janus Global Allocation Fund - Conservative (Class D Shares) 13 false true R46.htm 000071 - Document - Risk/Return Summary {Unlabeled} - Janus Global Allocation Fund - Moderate (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalAllocationFundModerateClassDShares Risk/Return Summary- Janus Global Allocation Fund - Moderate (Class D Shares) 14 false false R51.htm 000079 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Allocation Fund - Moderate (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalAllocationFundModerateClassDShares Risk/Return Detail Data- Janus Global Allocation Fund - Moderate (Class D Shares) 15 false true R52.htm 000081 - Document - Risk/Return Summary {Unlabeled} - Janus Global Allocation Fund - Growth (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalAllocationFundGrowthClassDShares Risk/Return Summary- Janus Global Allocation Fund - Growth (Class D Shares) 16 false false R57.htm 000089 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Allocation Fund - Growth (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalAllocationFundGrowthClassDShares Risk/Return Detail Data- Janus Global Allocation Fund - Growth (Class D Shares) 17 false true R58.htm 000091 - Document - Risk/Return Summary {Unlabeled} - Janus Flexible Bond Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusFlexibleBondFundClassACSINRTShares Risk/Return Summary- Janus Flexible Bond Fund (Class A, C, S, I, N, R, T Shares) 18 false false R65.htm 000099 - Disclosure - Risk/Return Detail Data {Elements} - Janus Flexible Bond Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusFlexibleBondFundClassACSINRTShares Risk/Return Detail Data- Janus Flexible Bond Fund (Class A, C, S, I, N, R, T Shares) 19 false true R66.htm 000101 - Document - Risk/Return Summary {Unlabeled} - Janus Global Bond Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalBondFundClassACSINTShares Risk/Return Summary- Janus Global Bond Fund (Class A, C, S, I, N, T Shares) 20 false false R73.htm 000109 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Bond Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalBondFundClassACSINTShares Risk/Return Detail Data- Janus Global Bond Fund (Class A, C, S, I, N, T Shares) 21 false true R74.htm 000111 - Document - Risk/Return Summary {Unlabeled} - Janus High-Yield Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusHighYieldFundClassACSINRTShares Risk/Return Summary- Janus High-Yield Fund (Class A, C, S, I, N, R, T Shares) 22 false false R81.htm 000119 - Disclosure - Risk/Return Detail Data {Elements} - Janus High-Yield Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusHighYieldFundClassACSINRTShares Risk/Return Detail Data- Janus High-Yield Fund (Class A, C, S, I, N, R, T Shares) 23 false true R82.htm 000121 - Document - Risk/Return Summary {Unlabeled} - Janus Multi-Sector Income Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusMultiSectorIncomeFundClassACSINTShares Risk/Return Summary- Janus Multi-Sector Income Fund (Class A, C, S, I, N, T Shares) 24 false false R87.htm 000129 - Disclosure - Risk/Return Detail Data {Elements} - Janus Multi-Sector Income Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusMultiSectorIncomeFundClassACSINTShares Risk/Return Detail Data- Janus Multi-Sector Income Fund (Class A, C, S, I, N, T Shares) 25 false true R88.htm 000131 - Document - Risk/Return Summary {Unlabeled} - Janus Real Return Fund (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusRealReturnFundClassACSITShares Risk/Return Summary- Janus Real Return Fund (Class A, C, S, I, T Shares) 26 false false R95.htm 000139 - Disclosure - Risk/Return Detail Data {Elements} - Janus Real Return Fund (Class A, C, S, I, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusRealReturnFundClassACSITShares Risk/Return Detail Data- Janus Real Return Fund (Class A, C, S, I, T Shares) 27 false true R96.htm 000141 - Document - Risk/Return Summary {Unlabeled} - Janus Short-Term Bond Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusShortTermBondFundClassACSINTShares Risk/Return Summary- Janus Short-Term Bond Fund (Class A, C, S, I, N, T Shares) 28 false false R103.htm 000149 - Disclosure - Risk/Return Detail Data {Elements} - Janus Short-Term Bond Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusShortTermBondFundClassACSINTShares Risk/Return Detail Data- Janus Short-Term Bond Fund (Class A, C, S, I, N, T Shares) 29 false true R104.htm 000151 - Document - Risk/Return Summary {Unlabeled} - Janus Flexible Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusFlexibleBondFundClassDShares Risk/Return Summary- Janus Flexible Bond Fund (Class D Shares) 30 false false R109.htm 000159 - Disclosure - Risk/Return Detail Data {Elements} - Janus Flexible Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusFlexibleBondFundClassDShares Risk/Return Detail Data- Janus Flexible Bond Fund (Class D Shares) 31 false true R110.htm 000161 - Document - Risk/Return Summary {Unlabeled} - Janus Global Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalBondFundClassDShares Risk/Return Summary- Janus Global Bond Fund (Class D Shares) 32 false false R115.htm 000169 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalBondFundClassDShares Risk/Return Detail Data- Janus Global Bond Fund (Class D Shares) 33 false true R116.htm 000171 - Document - Risk/Return Summary {Unlabeled} - Janus High-Yield Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusHighYieldFundClassDShares Risk/Return Summary- Janus High-Yield Fund (Class D Shares) 34 false false R121.htm 000179 - Disclosure - Risk/Return Detail Data {Elements} - Janus High-Yield Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusHighYieldFundClassDShares Risk/Return Detail Data- Janus High-Yield Fund (Class D Shares) 35 false true R122.htm 000181 - Document - Risk/Return Summary {Unlabeled} - Janus Multi-Sector Income Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusMultiSectorIncomeFundClassDShares Risk/Return Summary- Janus Multi-Sector Income Fund (Class D Shares) 36 false false R125.htm 000189 - Disclosure - Risk/Return Detail Data {Elements} - Janus Multi-Sector Income Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusMultiSectorIncomeFundClassDShares Risk/Return Detail Data- Janus Multi-Sector Income Fund (Class D Shares) 37 false true R126.htm 000191 - Document - Risk/Return Summary {Unlabeled} - Janus Real Return Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusRealReturnFundClassDShares Risk/Return Summary- Janus Real Return Fund (Class D Shares) 38 false false R131.htm 000199 - Disclosure - Risk/Return Detail Data {Elements} - Janus Real Return Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusRealReturnFundClassDShares Risk/Return Detail Data- Janus Real Return Fund (Class D Shares) 39 false true R132.htm 000201 - Document - Risk/Return Summary {Unlabeled} - Janus Short-Term Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusShortTermBondFundClassDShares Risk/Return Summary- Janus Short-Term Bond Fund (Class D Shares) 40 false false R137.htm 000209 - Disclosure - Risk/Return Detail Data {Elements} - Janus Short-Term Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusShortTermBondFundClassDShares Risk/Return Detail Data- Janus Short-Term Bond Fund (Class D Shares) 41 false true R138.htm 000211 - Document - Risk/Return Summary {Unlabeled} - Janus Global Unconstrained Bond Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalUnconstrainedBondFundClassACSINRTShares Risk/Return Summary- Janus Global Unconstrained Bond Fund (Class A, C, S, I, N, R, T Shares) 42 false false R143.htm 000219 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Unconstrained Bond Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalUnconstrainedBondFundClassACSINRTShares Risk/Return Detail Data- Janus Global Unconstrained Bond Fund (Class A, C, S, I, N, R, T Shares) 43 false true R144.htm 000221 - Document - Risk/Return Summary {Unlabeled} - Janus Global Unconstrained Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGlobalUnconstrainedBondFundClassDShares Risk/Return Summary- Janus Global Unconstrained Bond Fund (Class D Shares) 44 false false R147.htm 000229 - Disclosure - Risk/Return Detail Data {Elements} - Janus Global Unconstrained Bond Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGlobalUnconstrainedBondFundClassDShares Risk/Return Detail Data- Janus Global Unconstrained Bond Fund (Class D Shares) 45 false true R148.htm 000231 - Document - Risk/Return Summary {Unlabeled} - Janus Adaptive Global Allocation Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusAdaptiveGlobalAllocationFundClassACSINTShares Risk/Return Summary- Janus Adaptive Global Allocation Fund (Class A, C, S, I, N, T Shares) 46 false false R153.htm 000239 - Disclosure - Risk/Return Detail Data {Elements} - Janus Adaptive Global Allocation Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusAdaptiveGlobalAllocationFundClassACSINTShares Risk/Return Detail Data- Janus Adaptive Global Allocation Fund (Class A, C, S, I, N, T Shares) 47 false true R154.htm 000241 - Document - Risk/Return Summary {Unlabeled} - Janus Adaptive Global Allocation Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusAdaptiveGlobalAllocationFundClassDShares Risk/Return Summary- Janus Adaptive Global Allocation Fund (Class D Shares) 48 false false R157.htm 000249 - Disclosure - Risk/Return Detail Data {Elements} - Janus Adaptive Global Allocation Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusAdaptiveGlobalAllocationFundClassDShares Risk/Return Detail Data- Janus Adaptive Global Allocation Fund (Class D Shares) 49 false true R158.htm 000251 - Document - Risk/Return Summary {Unlabeled} - INTECH Emerging Markets Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHEmergingMarketsManagedVolatilityFundClassACSINTShares Risk/Return Summary- INTECH Emerging Markets Managed Volatility Fund (Class A, C, S, I, N, T Shares) 50 false false R163.htm 000259 - Disclosure - Risk/Return Detail Data {Elements} - INTECH Emerging Markets Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHEmergingMarketsManagedVolatilityFundClassACSINTShares Risk/Return Detail Data- INTECH Emerging Markets Managed Volatility Fund (Class A, C, S, I, N, T Shares) 51 false true R164.htm 000261 - Document - Risk/Return Summary {Unlabeled} - INTECH Global Income Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHGlobalIncomeManagedVolatilityFundClassACSINTShares Risk/Return Summary- INTECH Global Income Managed Volatility Fund (Class A, C, S, I, N, T Shares) 52 false false R171.htm 000269 - Disclosure - Risk/Return Detail Data {Elements} - INTECH Global Income Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHGlobalIncomeManagedVolatilityFundClassACSINTShares Risk/Return Detail Data- INTECH Global Income Managed Volatility Fund (Class A, C, S, I, N, T Shares) 53 false true R172.htm 000271 - Document - Risk/Return Summary {Unlabeled} - INTECH International Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHInternationalManagedVolatilityFundClassACSINTShares Risk/Return Summary- INTECH International Managed Volatility Fund (Class A, C, S, I, N, T Shares) 54 false false R179.htm 000279 - Disclosure - Risk/Return Detail Data {Elements} - INTECH International Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHInternationalManagedVolatilityFundClassACSINTShares Risk/Return Detail Data- INTECH International Managed Volatility Fund (Class A, C, S, I, N, T Shares) 55 false true R180.htm 000281 - Document - Risk/Return Summary {Unlabeled} - INTECH U.S. Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHUSManagedVolatilityFundClassACSINTShares Risk/Return Summary- INTECH U.S. Managed Volatility Fund (Class A, C, S, I, N, T Shares) 56 false false R187.htm 000289 - Disclosure - Risk/Return Detail Data {Elements} - INTECH U.S. Managed Volatility Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHUSManagedVolatilityFundClassACSINTShares Risk/Return Detail Data- INTECH U.S. Managed Volatility Fund (Class A, C, S, I, N, T Shares) 57 false true R188.htm 000291 - Document - Risk/Return Summary {Unlabeled} - INTECH Emerging Markets Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHEmergingMarketsManagedVolatilityFundClassDShares Risk/Return Summary- INTECH Emerging Markets Managed Volatility Fund (Class D Shares) 58 false false R191.htm 000299 - Disclosure - Risk/Return Detail Data {Elements} - INTECH Emerging Markets Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHEmergingMarketsManagedVolatilityFundClassDShares Risk/Return Detail Data- INTECH Emerging Markets Managed Volatility Fund (Class D Shares) 59 false true R192.htm 000301 - Document - Risk/Return Summary {Unlabeled} - INTECH Global Income Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHGlobalIncomeManagedVolatilityFundClassDShares Risk/Return Summary- INTECH Global Income Managed Volatility Fund (Class D Shares) 60 false false R197.htm 000309 - Disclosure - Risk/Return Detail Data {Elements} - INTECH Global Income Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHGlobalIncomeManagedVolatilityFundClassDShares Risk/Return Detail Data- INTECH Global Income Managed Volatility Fund (Class D Shares) 61 false true R198.htm 000311 - Document - Risk/Return Summary {Unlabeled} - INTECH International Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHInternationalManagedVolatilityFundClassDShares Risk/Return Summary- INTECH International Managed Volatility Fund (Class D Shares) 62 false false R203.htm 000319 - Disclosure - Risk/Return Detail Data {Elements} - INTECH International Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHInternationalManagedVolatilityFundClassDShares Risk/Return Detail Data- INTECH International Managed Volatility Fund (Class D Shares) 63 false true R204.htm 000321 - Document - Risk/Return Summary {Unlabeled} - INTECH U.S. Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHUSManagedVolatilityFundClassDShares Risk/Return Summary- INTECH U.S. Managed Volatility Fund (Class D Shares) 64 false false R209.htm 000329 - Disclosure - Risk/Return Detail Data {Elements} - INTECH U.S. Managed Volatility Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHUSManagedVolatilityFundClassDShares Risk/Return Detail Data- INTECH U.S. Managed Volatility Fund (Class D Shares) 65 false true R210.htm 000331 - Document - Risk/Return Summary {Unlabeled} - INTECH U.S. Core Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHUSCoreFundClassACSINTShares Risk/Return Summary- INTECH U.S. Core Fund (Class A, C, S, I, N, T Shares) 66 false false R217.htm 000339 - Disclosure - Risk/Return Detail Data {Elements} - INTECH U.S. Core Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHUSCoreFundClassACSINTShares Risk/Return Detail Data- INTECH U.S. Core Fund (Class A, C, S, I, N, T Shares) 67 false true R218.htm 000341 - Document - Risk/Return Summary {Unlabeled} - INTECH U.S. Core Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledINTECHUSCoreFundClassDShares Risk/Return Summary- INTECH U.S. Core Fund (Class D Shares) 68 false false R223.htm 000349 - Disclosure - Risk/Return Detail Data {Elements} - INTECH U.S. Core Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsINTECHUSCoreFundClassDShares Risk/Return Detail Data- INTECH U.S. Core Fund (Class D Shares) 69 false true R224.htm 000351 - Document - Risk/Return Summary {Unlabeled} - Janus Government Money Market Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGovernmentMoneyMarketFundClassDShares Risk/Return Summary- Janus Government Money Market Fund (Class D Shares) 70 false false R229.htm 000359 - Disclosure - Risk/Return Detail Data {Elements} - Janus Government Money Market Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGovernmentMoneyMarketFundClassDShares Risk/Return Detail Data- Janus Government Money Market Fund (Class D Shares) 71 false true R230.htm 000361 - Document - Risk/Return Summary {Unlabeled} - Janus Money Market Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusMoneyMarketFundClassDShares Risk/Return Summary- Janus Money Market Fund (Class D Shares) 72 false false R235.htm 000369 - Disclosure - Risk/Return Detail Data {Elements} - Janus Money Market Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusMoneyMarketFundClassDShares Risk/Return Detail Data- Janus Money Market Fund (Class D Shares) 73 false true R236.htm 000371 - Document - Risk/Return Summary {Unlabeled} - Janus Government Money Market Fund (Class T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusGovernmentMoneyMarketFundClassTShares Risk/Return Summary- Janus Government Money Market Fund (Class T Shares) 74 false false R241.htm 000379 - Disclosure - Risk/Return Detail Data {Elements} - Janus Government Money Market Fund (Class T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusGovernmentMoneyMarketFundClassTShares Risk/Return Detail Data- Janus Government Money Market Fund (Class T Shares) 75 false true R242.htm 000381 - Document - Risk/Return Summary {Unlabeled} - Janus Money Market Fund (Class T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledJanusMoneyMarketFundClassTShares Risk/Return Summary- Janus Money Market Fund (Class T Shares) 76 false false R247.htm 000389 - Disclosure - Risk/Return Detail Data {Elements} - Janus Money Market Fund (Class T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsJanusMoneyMarketFundClassTShares Risk/Return Detail Data- Janus Money Market Fund (Class T Shares) 77 false true R248.htm 000391 - Document - Risk/Return Summary {Unlabeled} - Perkins Large Cap Value Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsLargeCapValueFundClassACSINTShares Risk/Return Summary- Perkins Large Cap Value Fund (Class A, C, S, I, N, T Shares) 78 false false R255.htm 000399 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Large Cap Value Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsLargeCapValueFundClassACSINTShares Risk/Return Detail Data- Perkins Large Cap Value Fund (Class A, C, S, I, N, T Shares) 79 false true R256.htm 000401 - Document - Risk/Return Summary {Unlabeled} - Perkins Mid Cap Value Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsMidCapValueFundClassACSINRTShares Risk/Return Summary- Perkins Mid Cap Value Fund (Class A, C, S, I, N, R, T Shares) 80 false false R263.htm 000409 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Mid Cap Value Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsMidCapValueFundClassACSINRTShares Risk/Return Detail Data- Perkins Mid Cap Value Fund (Class A, C, S, I, N, R, T Shares) 81 false true R264.htm 000411 - Document - Risk/Return Summary {Unlabeled} - Perkins Select Value Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsSelectValueFundClassACSINTShares Risk/Return Summary- Perkins Select Value Fund (Class A, C, S, I, N, T Shares) 82 false false R271.htm 000419 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Select Value Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsSelectValueFundClassACSINTShares Risk/Return Detail Data- Perkins Select Value Fund (Class A, C, S, I, N, T Shares) 83 false true R272.htm 000421 - Document - Risk/Return Summary {Unlabeled} - Perkins Small Cap Value Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsSmallCapValueFundClassACSINRTShares Risk/Return Summary- Perkins Small Cap Value Fund (Class A, C, S, I, N, R, T Shares) 84 false false R279.htm 000429 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Small Cap Value Fund (Class A, C, S, I, N, R, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsSmallCapValueFundClassACSINRTShares Risk/Return Detail Data- Perkins Small Cap Value Fund (Class A, C, S, I, N, R, T Shares) 85 false true R280.htm 000431 - Document - Risk/Return Summary {Unlabeled} - Perkins Value Plus Income Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsValuePlusIncomeFundClassACSINTShares Risk/Return Summary- Perkins Value Plus Income Fund (Class A, C, S, I, N, T Shares) 86 false false R287.htm 000439 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Value Plus Income Fund (Class A, C, S, I, N, T Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsValuePlusIncomeFundClassACSINTShares Risk/Return Detail Data- Perkins Value Plus Income Fund (Class A, C, S, I, N, T Shares) 87 false true R288.htm 000441 - Document - Risk/Return Summary {Unlabeled} - Perkins Large Cap Value Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsLargeCapValueFundClassDShares Risk/Return Summary- Perkins Large Cap Value Fund (Class D Shares) 88 false false R293.htm 000449 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Large Cap Value Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsLargeCapValueFundClassDShares Risk/Return Detail Data- Perkins Large Cap Value Fund (Class D Shares) 89 false true R294.htm 000451 - Document - Risk/Return Summary {Unlabeled} - Perkins Mid Cap Value Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsMidCapValueFundClassDShares Risk/Return Summary- Perkins Mid Cap Value Fund (Class D Shares) 90 false false R299.htm 000459 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Mid Cap Value Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsMidCapValueFundClassDShares Risk/Return Detail Data- Perkins Mid Cap Value Fund (Class D Shares) 91 false true R300.htm 000461 - Document - Risk/Return Summary {Unlabeled} - Perkins Select Value Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsSelectValueFundClassDShares Risk/Return Summary- Perkins Select Value Fund (Class D Shares) 92 false false R305.htm 000469 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Select Value Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsSelectValueFundClassDShares Risk/Return Detail Data- Perkins Select Value Fund (Class D Shares) 93 false true R306.htm 000471 - Document - Risk/Return Summary {Unlabeled} - Perkins Small Cap Value Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsSmallCapValueFundClassDShares Risk/Return Summary- Perkins Small Cap Value Fund (Class D Shares) 94 false false R311.htm 000479 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Small Cap Value Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsSmallCapValueFundClassDShares Risk/Return Detail Data- Perkins Small Cap Value Fund (Class D Shares) 95 false true R312.htm 000481 - Document - Risk/Return Summary {Unlabeled} - Perkins Value Plus Income Fund (Class D Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsValuePlusIncomeFundClassDShares Risk/Return Summary- Perkins Value Plus Income Fund (Class D Shares) 96 false false R317.htm 000489 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Value Plus Income Fund (Class D Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsValuePlusIncomeFundClassDShares Risk/Return Detail Data- Perkins Value Plus Income Fund (Class D Shares) 97 false true R318.htm 000491 - Document - Risk/Return Summary {Unlabeled} - Perkins Mid Cap Value Fund (Class L Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsMidCapValueFundClassLShares Risk/Return Summary- Perkins Mid Cap Value Fund (Class L Shares) 98 false false R323.htm 000499 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Mid Cap Value Fund (Class L Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsMidCapValueFundClassLShares Risk/Return Detail Data- Perkins Mid Cap Value Fund (Class L Shares) 99 false true R324.htm 000501 - Document - Risk/Return Summary {Unlabeled} - Perkins Small Cap Value Fund (Class L Shares) Sheet http://www.janus.com/role/DocumentRiskReturnSummaryUnlabeledPerkinsSmallCapValueFundClassLShares Risk/Return Summary- Perkins Small Cap Value Fund (Class L Shares) 100 false false R329.htm 000509 - Disclosure - Risk/Return Detail Data {Elements} - Perkins Small Cap Value Fund (Class L Shares) Sheet http://www.janus.com/role/DisclosureRiskReturnDetailDataElementsPerkinsSmallCapValueFundClassLShares Risk/Return Detail Data- Perkins Small Cap Value Fund (Class L Shares) 101 false false R330.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 102 false false All Reports Book All Reports jif-20151028.xml jif-20151028_cal.xml jif-20151028_def.xml jif-20151028_lab.xml jif-20151028_pre.xml jif-20151028.xsd BarChart1.png BarChart2.png BarChart3.png BarChart4.png BarChart5.png BarChart6.png BarChart7.png BarChart8.png BarChart9.png BarChart10.png BarChart11.png BarChart12.png BarChart13.png BarChart14.png BarChart15.png BarChart16.png BarChart17.png BarChart18.png BarChart19.png BarChart20.png BarChart21.png BarChart22.png BarChart23.png BarChart24.png BarChart25.png BarChart26.png BarChart27.png BarChart28.png BarChart29.png BarChart30.png BarChart31.png BarChart32.png BarChart33.png BarChart34.png BarChart35.png BarChart36.png BarChart37.png BarChart38.png BarChart39.png BarChart40.png BarChart41.png BarChart42.png true true