2.2.0.25 true Sheet 0100006 - Document - Risk/Return Summary - Janus Worldwide Fund (Class A, C, S, I, R & T Shares) {Unlabeled} Risk/Return Summary - Janus Worldwide Fund (Class A, C, S, I, R & T Shares) http://janus.com/role/RiskReturnSummaryJanusWorldwideFund false R1.xml false Sheet 0100013 - Document - Risk/Return Summary - Janus Worldwide Fund (Class D Shares) {Unlabeled} Risk/Return Summary - Janus Worldwide Fund (Class D Shares) http://janus.com/role/RiskReturnSummaryJanusWorldwideFundClassDShares false R2.xml false Sheet 040000 - Disclosure - Risk/Return Detail Data {Elements} Risk/Return Detail Data http://janus.com/role/RiskReturnDetailData false R3.xml false Book All Reports All Reports false 1 3 3 0 0 12 false false TwelveMonthsEnded_28Jan2011_S000010489_Member_Prospectus_Two_Member 4 TwelveMonthsEnded_28Jan2011 8 TwelveMonthsEnded_28Jan2011_S000010489_Member_Prospectus_One_Member 4 true true