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Financial Instruments and Fair Value Measurements (Schedule of Carrying Amount and Fair Value of Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 26, 2014
Sep. 27, 2013
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loan payable $ 0us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 0.1us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Value | Secured Debt | Receivable Securitization    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 150.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ReceivableSecuritizationMaturityDateofJuly2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ReceivableSecuritizationMaturityDateofJuly2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Carrying Value | Secured Debt | 2.85% Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 3.1us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TwoPointEightFivePercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TwoPointEightFivePercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Carrying Value | Secured Debt | Term Loan and New Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,990.3us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TermLoanandNewTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TermLoanandNewTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Carrying Value | Secured Debt | 4.00% Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 10.8us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointZeroZeroPercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointZeroZeroPercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Carrying Value | Senior Notes | 3.50% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 300.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ThreePointFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 299.9us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ThreePointFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Carrying Value | Senior Notes | 5.75% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 900.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FivePointSevenFivePercentNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FivePointSevenFivePercentNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Carrying Value | Senior Notes | 4.75% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 598.3us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointSevenFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 598.2us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointSevenFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Carrying Value | Debentures | 9.50% Debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 10.4us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_NinePointFivePercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember		 10.4us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_NinePointFivePercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember
Carrying Value | Debentures | 8.00% Debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 8.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_EightPercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember		 8.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_EightPercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loan payable 0us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 0.1us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value | Secured Debt | Receivable Securitization    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 150.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ReceivableSecuritizationMaturityDateofJuly2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ReceivableSecuritizationMaturityDateofJuly2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Fair Value | Secured Debt | 2.85% Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 3.1us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TwoPointEightFivePercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TwoPointEightFivePercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Fair Value | Secured Debt | Term Loan and New Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,970.4us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TermLoanandNewTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_TermLoanandNewTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Fair Value | Secured Debt | 4.00% Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 10.8us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointZeroZeroPercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointZeroZeroPercentTermLoanMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Fair Value | Senior Notes | 3.50% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 290.2us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ThreePointFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 293.7us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_ThreePointFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Fair Value | Senior Notes | 5.75% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 907.3us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FivePointSevenFivePercentNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FivePointSevenFivePercentNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Fair Value | Senior Notes | 4.75% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 563.8us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointSevenFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 568.5us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_FourPointSevenFivePercentNoteMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Fair Value | Debentures | 9.50% Debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 14.2us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_NinePointFivePercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember		 14.3us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_NinePointFivePercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember
Fair Value | Debentures | 8.00% Debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 10.2us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_EightPercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember		 $ 10.2us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mnk_EightPercentDebentureMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= mnk_DebenturesMember