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Transactions with Former Parent Company (Details) (USD $)
12 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Sep. 28, 2012
Jun. 28, 2013
Related Party Transaction [Line Items]        
Provision for (benefit from) income taxes $ (44,800,000)us-gaap_IncomeTaxExpenseBenefit $ 68,600,000us-gaap_IncomeTaxExpenseBenefit $ 94,800,000us-gaap_IncomeTaxExpenseBenefit  
Covidien | Separation and Distribution Agreement        
Related Party Transaction [Line Items]        
Initial cash capitalization       168,000,000mnk_InitialCashCapitaization
/ us-gaap_RelatedPartyTransactionAxis
= mnk_SeparationAgreementwithCovidienMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
Estimated cash upon completion of distribution       168,000,000mnk_EstimatedCashUponCompletionofDistribution
/ us-gaap_RelatedPartyTransactionAxis
= mnk_SeparationAgreementwithCovidienMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
Adjustment payment benchmark       20,000,000mnk_EstimatedCashUponCompletionofDistributionAdjustmentPaymentBenchmark
/ us-gaap_RelatedPartyTransactionAxis
= mnk_SeparationAgreementwithCovidienMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
Final adjustment payment 0mnk_EstimatedCashUponCompletionofDistributionFinalAdjustmentPayment
/ us-gaap_RelatedPartyTransactionAxis
= mnk_SeparationAgreementwithCovidienMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
     
Covidien | Tax Matters Agreement        
Related Party Transaction [Line Items]        
Tax agreement, tax threshold 200,000,000mnk_TaxAgreementTaxThreshold
/ us-gaap_RelatedPartyTransactionAxis
= mnk_TaxMattersAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
     
Provision for (benefit from) income taxes 33,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_RelatedPartyTransactionAxis
= mnk_TaxMattersAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
     
Change in ownership percentage 35.00%mnk_TaxAgreementChangeinOwnershipPercentage
/ us-gaap_RelatedPartyTransactionAxis
= mnk_TaxMattersAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
     
Covidien | Minimum | Tax Matters Agreement        
Related Party Transaction [Line Items]        
Restriction period 2 years      
Covidien | Maximum | Tax Matters Agreement        
Related Party Transaction [Line Items]        
Restriction period 5 years      
Covidien | Net Sales        
Related Party Transaction [Line Items]        
Inventory sold 46,000,000us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
51,200,000us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
54,200,000us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
 
Covidien | Cost of sales        
Related Party Transaction [Line Items]        
Inventory purchases 28,900,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
38,400,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
34,700,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
 
Covidien | Selling, general and administrative        
Related Party Transaction [Line Items]        
Allocated expenses   39,600,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
49,200,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
 
Covidien | Prepaid expenses and other current assets        
Related Party Transaction [Line Items]        
Due from related parties 82,200,000us-gaap_DueFromRelatedParties
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
     
Covidien | Other current liabilities        
Related Party Transaction [Line Items]        
Due to related parties $ 84,500,000us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember