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Transactions with Former Parent Company (Details) (Covidien, USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Sep. 26, 2014
Net sales
     
Related Party Transaction [Line Items]      
Inventory sold $ 9.2us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
$ 12.1us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
 
Cost of sales
     
Related Party Transaction [Line Items]      
Inventory purchases 4.5us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
10.0us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
 
Prepaid expenses and other current assets
     
Related Party Transaction [Line Items]      
Due from related parties 17.5us-gaap_DueFromRelatedParties
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
  82.2us-gaap_DueFromRelatedParties
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
Accrued and other liabilities
     
Related Party Transaction [Line Items]      
Due to related parties $ 20.0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember
  $ 84.5us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mnk_CovidienPlcMember