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Financial Instruments and Fair Value Measurements (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Dec. 26, 2014
CNS Therapeutics, Inc.
Oct. 01, 2012
CNS Therapeutics, Inc.
USD ($)
Aug. 14, 2014
Questcor Pharmaceuticals, Inc.
USD ($)
Dec. 26, 2014
Secured Debt
2.85% Term Loan
Level 3
Dec. 26, 2014
Secured Debt
4.00% Term Loan
Level 3
Dec. 26, 2014
Debentures
8.00% Debenture
Level 2
Dec. 26, 2014
Debentures
9.50% Debenture
Level 2
Apr. 30, 2013
Senior Notes
3.50% Senior Notes
Dec. 26, 2014
Senior Notes
3.50% Senior Notes
Level 1
Apr. 30, 2013
Senior Notes
4.75% Senior Notes
Dec. 26, 2014
Senior Notes
4.75% Senior Notes
Level 1
Aug. 13, 2014
Senior Notes
5.75% Senior Notes
Dec. 26, 2014
Senior Notes
5.75% Senior Notes
Level 1
Dec. 26, 2014
Other Assets
Level 1
USD ($)
Sep. 26, 2014
Other Assets
Level 1
USD ($)
Dec. 26, 2014
Other Assets
Level 3
USD ($)
Sep. 26, 2014
Other Assets
Level 3
USD ($)
Dec. 26, 2014
Recurring
Level 3
CNS Therapeutics, Inc.
USD ($)
Dec. 26, 2014
Recurring
Level 3
Questcor Pharmaceuticals, Inc.
USD ($)
Dec. 26, 2014
Synacthen
Questcor Pharmaceuticals, Inc.
USD ($)
Dec. 26, 2014
Synacthen
Fiscal 2015 and 2016
Questcor Pharmaceuticals, Inc.
USD ($)
Dec. 26, 2014
Synacthen
Fiscal 2015 and 2016
Prepaid expenses and other current assets
Questcor Pharmaceuticals, Inc.
USD ($)
Dec. 26, 2014
Synacthen
Subsequent to Fiscal 2016
Questcor Pharmaceuticals, Inc.
USD ($)
Dec. 26, 2014
BioVectra, Inc.
Questcor Pharmaceuticals, Inc.
CAD
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                
Fair value of contingent consideration   $ 6.9us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= mnk_CnsTherapeuticsIncMember
                              $ 7.1us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= mnk_CnsTherapeuticsIncMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
           
Maximum contingent payments for acquisition   9.0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= mnk_CnsTherapeuticsIncMember
                                           
Discount rate 1.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= mnk_CnsTherapeuticsIncMember
                                    4.70%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ us-gaap_ProductOrServiceAxis
= mnk_SynacthenMember
      1.30%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ dei_LegalEntityAxis
= mnk_BioVectraIncMember
Fair value of contingent liability     195.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
                              195.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
        45.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ dei_LegalEntityAxis
= mnk_BioVectraIncMember
Milestone payments                                         25.0mnk_MilestonePayments
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ mnk_FiscalYearAxis
= mnk_Fiscal2015and2016Member
/ us-gaap_ProductOrServiceAxis
= mnk_SynacthenMember
25.0mnk_MilestonePayments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ mnk_FiscalYearAxis
= mnk_Fiscal2015and2016Member
/ us-gaap_ProductOrServiceAxis
= mnk_SynacthenMember
25.0mnk_MilestonePayments
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ mnk_FiscalYearAxis
= mnk_SubsequenttoFiscal2016Member
/ us-gaap_ProductOrServiceAxis
= mnk_SynacthenMember
 
Milestone payment, upon FDA approval                                       25.0mnk_MilestonePaymentsFDAApproval
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ us-gaap_ProductOrServiceAxis
= mnk_SynacthenMember
       
Milestone payments, maximum amount                                       215.0mnk_MilestonePaymentMaximumAmount
/ us-gaap_BusinessAcquisitionAxis
= mnk_QuestcorPharmaceuticalsInc.Member
/ us-gaap_ProductOrServiceAxis
= mnk_SynacthenMember
       
Restricted cash                           69.4mnk_RestrictedCashFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
69.8mnk_RestrictedCashFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
                 
Cash surrender value of life insurance                               $ 68.7us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 69.0us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
             
Stated interest rate       2.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_TwoPointEightFivePercentTermLoanMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointZeroZeroPercentTermLoanMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_EightPercentDebentureMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember
9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_NinePointFivePercentDebentureMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember
3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_ThreePointFivePercentNoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_ThreePointFivePercentNoteMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointSevenFivePercentNoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointSevenFivePercentNoteMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_FivePointSevenFivePercentNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mnk_FivePointSevenFivePercentNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember