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Restructuring and Related Charges (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 26, 2014
2013 Mallinckrodt program | Minimum  
Restructuring Cost and Reserve [Line Items]  
2013 Mallinckrodt program expected cost range $ 100.0us-gaap_RestructuringAndRelatedCostExpectedCost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringPlanAxis
= mnk_RestructuringFiscal2013PlanMember
2013 Mallinckrodt program | Maximum  
Restructuring Cost and Reserve [Line Items]  
2013 Mallinckrodt program expected cost range 125.0us-gaap_RestructuringAndRelatedCostExpectedCost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringPlanAxis
= mnk_RestructuringFiscal2013PlanMember
Severance  
Restructuring Cost and Reserve [Line Items]  
Accelerated share-based compensation expense $ 6.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember