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Financial Instruments and Fair Value Measurements (Schedules of Concentration of Risk) (Details)
 3 Months Ended 12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Sep. 26, 2014
Distributor Concentration Risk | Net Sales Attributable to Distributors | CuraScript, Inc      
Concentration Risk [Line Items]      
Concentration risk, percentage 31.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CuraScriptIncMember		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CuraScriptIncMember		  
Distributor Concentration Risk | Net Sales Attributable to Distributors | McKesson Corporation      
Concentration Risk [Line Items]      
Concentration risk, percentage 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_McKessonCorporationMember		 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_McKessonCorporationMember		  
Distributor Concentration Risk | Net Sales Attributable to Distributors | Cardinal Health, Inc.      
Concentration Risk [Line Items]      
Concentration risk, percentage 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CardinalHealthInc.Member		 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CardinalHealthInc.Member		  
Distributor Concentration Risk | Net Sales Attributable to Distributors | Amerisource Bergen Corporation      
Concentration Risk [Line Items]      
Concentration risk, percentage 7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_AmerisourceBergenCorporationMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_AmerisourceBergenCorporationMember		  
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | CuraScript, Inc      
Concentration Risk [Line Items]      
Concentration risk, percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CuraScriptIncMember		   13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CuraScriptIncMember
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | McKesson Corporation      
Concentration Risk [Line Items]      
Concentration risk, percentage 32.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_McKessonCorporationMember		   24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_McKessonCorporationMember
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Cardinal Health, Inc.      
Concentration Risk [Line Items]      
Concentration risk, percentage 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CardinalHealthInc.Member		   17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_CardinalHealthInc.Member
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Amerisource Bergen Corporation      
Concentration Risk [Line Items]      
Concentration risk, percentage 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_AmerisourceBergenCorporationMember		   13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mnk_DistributorConcentrationRiskMember
/ dei_LegalEntityAxis
= mnk_AmerisourceBergenCorporationMember
Product Concentration Risk | Net Sales Attributable to Products | Acthar (Specialty Brands)      
Concentration Risk [Line Items]      
Concentration risk, percentage 31.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mnk_H.P.ActharGelMember		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mnk_H.P.ActharGelMember		  
Product Concentration Risk | Net Sales Attributable to Products | Optiray (CMDS)      
Concentration Risk [Line Items]      
Concentration risk, percentage 7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mnk_OptirayCMDSMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mnk_OptirayCMDSMember		  
Product Concentration Risk | Net Sales Attributable to Products | Methylphenidate ER (Specialty Generics)      
Concentration Risk [Line Items]      
Concentration risk, percentage 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mnk_MethylphenidateERHClGenericsMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mnk_MethylphenidateERHClGenericsMember