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Commitments and Contingencies (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Sep. 28, 2012
Aug. 31, 2011
Patents
Jun. 27, 2014
Aug. 31, 2013
lawsuit
Case
Aug. 31, 2012
principal
Sep. 26, 2012
action
Apr. 11, 2014
Loss Contingencies [Line Items]                  
Remedial cost range, minimum $ 43,700,000us-gaap_LossContingencyRangeOfPossibleLossMinimum                
Remedial cost range, maximum 106,900,000us-gaap_LossContingencyRangeOfPossibleLossMaximum                
Environmental liabilities 67,100,000us-gaap_AccrualForEnvironmentalLossContingencies                
Rent expense 19,900,000us-gaap_OperatingLeasesRentExpenseNet 16,900,000us-gaap_OperatingLeasesRentExpenseNet 15,500,000us-gaap_OperatingLeasesRentExpenseNet            
Plant assets exchanged for IRBs 27,400,000us-gaap_PropertyPlantAndEquipmentDisposals                
Period of property tax abatement 10 years                
Tax Matters Agreement | Covidien                  
Loss Contingencies [Line Items]                  
Tax agreement, tax threshold 200,000,000mnk_TaxAgreementTaxThreshold
/ us-gaap_RelatedPartyTransactionAxis
= mnk_TaxMattersAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember		                
Asbestos Matters                  
Loss Contingencies [Line Items]                  
Pending claims 11,900us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mnk_AsbestosMattersMember		                
Estimation of liability, historical term 5 years                
Estimation of liability, expected future term of claims 7 years                
Accrued and other current liabilities                  
Loss Contingencies [Line Items]                  
Environmental liabilities, current 7,200,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent
/ us-gaap_BalanceSheetLocationAxis
= mnk_AccruedAndOtherCurrentLiabilitiesMember		                
'222 and '218 Patent Litigation                  
Loss Contingencies [Line Items]                  
Patents allegedly infringed       2us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= mnk_Patent222and218LitigationMember		          
Expiration period       30 months          
Loss contingency charge         11,500,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LitigationCaseAxis
= mnk_Patent222and218LitigationMember		        
Previously settled claims 3us-gaap_LossContingencyClaimsSettledNumber
/ us-gaap_LitigationCaseAxis
= mnk_Patent222and218LitigationMember		                
Glenridge Litigation                  
Loss Contingencies [Line Items]                  
Number of defendants             3us-gaap_LossContingencyNumberOfDefendants
/ us-gaap_LitigationCaseAxis
= mnk_GlenridgeLitigationMember		    
Number of lawsuits consolidated           2mnk_LossContingencyLawsuitsNumber
/ us-gaap_LitigationCaseAxis
= mnk_GlenridgeLitigationMember		      
Pending claims           1us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= mnk_GlenridgeLitigationMember		      
Questcor Securities Litigation                  
Loss Contingencies [Line Items]                  
Filed-actions consolidated into the lawsuit               4mnk_NumberofFiledActionsConsolidatedIntoLawsuit
/ us-gaap_LitigationCaseAxis
= mnk_QuestcorSecuritiesLitigationMember		  
Questcor Shareholder Derivative Litigation                  
Loss Contingencies [Line Items]                  
Filed-actions consolidated into the lawsuit               5mnk_NumberofFiledActionsConsolidatedIntoLawsuit
/ us-gaap_LitigationCaseAxis
= mnk_QuestcorShareholderDerivativeLitigationMember		  
Federal derivative action staying period a 60 days                
Federal derivative action staying period b 60 days                
David Taban, et al. v. Questcor Pharmaceuticals, Inc                  
Loss Contingencies [Line Items]                  
Federal derivative action staying period a 60 days                
Federal derivative action staying period b 60 days                
Mallinckrodt Veterinary, Inc., Millsboro, Delaware                  
Loss Contingencies [Line Items]                  
Number of Administrative Orders of Consent 2mnk_NumberofAdministrativeOrdersofConsentEnteredInto
/ us-gaap_LitigationCaseAxis
= mnk_MallinckrodtVeterinaryInc.MillsboroDelawareMember		                
Lower Passaic River, New Jersey                  
Loss Contingencies [Line Items]                  
Number of defendants 70us-gaap_LossContingencyNumberOfDefendants
/ us-gaap_LitigationCaseAxis
= mnk_LowerPassaicRiverNewJerseyMember		                
Remedial cost range, minimum                 365,000,000us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ us-gaap_LitigationCaseAxis
= mnk_LowerPassaicRiverNewJerseyMember
Remedial cost range, maximum                 3,200,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LitigationCaseAxis
= mnk_LowerPassaicRiverNewJerseyMember
Environmental liabilities                 23,100,000us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_LitigationCaseAxis
= mnk_LowerPassaicRiverNewJerseyMember
Remedial cost, estimate                 $ 1,700,000,000us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LitigationCaseAxis
= mnk_LowerPassaicRiverNewJerseyMember