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Restructuring and Related Charges (Schedule of Net Restructuring and Related Charges) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net $ 7.3mnk_TotalRestructuringAndRelatedExpense $ 8.1mnk_TotalRestructuringAndRelatedExpense
Less: non-cash charges, including accelerated share-based compensation expense (6.9)mnk_RestructuringandRelatedCostsNoncashChargesIncludingAcceleratedDepreciation (0.1)mnk_RestructuringandRelatedCostsNoncashChargesIncludingAcceleratedDepreciation
Total charges expected to be settled in cash 0.4mnk_RestructuringandRelatedCostsTotalChargesExpectedtobeSettledinCash 8.0mnk_RestructuringandRelatedCostsTotalChargesExpectedtobeSettledinCash
2013 Mallinckrodt program    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net (4.9)mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_RestructuringPlanAxis
= mnk_RestructuringFiscal2013PlanMember		 8.3mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_RestructuringPlanAxis
= mnk_RestructuringFiscal2013PlanMember
Acquisitions    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net 12.2mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_RestructuringPlanAxis
= mnk_BusinessAcquisitionMember		 0mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_RestructuringPlanAxis
= mnk_BusinessAcquisitionMember
Other    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net $ 0mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_RestructuringPlanAxis
= us-gaap_OtherRestructuringMember		 $ (0.2)mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_RestructuringPlanAxis
= us-gaap_OtherRestructuringMember