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Restructuring and Related Charges (Schedule of Restructuring and Related Charges by Segment) (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: accelerated depreciation (0.1)us-gaap_RestructuringReserveAcceleratedDepreciation (0.1)us-gaap_RestructuringReserveAcceleratedDepreciation
Restructuring charges, net 7.2us-gaap_RestructuringCharges 8.0us-gaap_RestructuringCharges
Specialty Brands    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net 14.2mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyBrandsMember		 0mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyBrandsMember
Specialty Generics    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net 0mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyGenericsMember		 0mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyGenericsMember
Global Medical Imaging    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net (7.3)mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_GlobalMedicalImagingMember		 8.1mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_GlobalMedicalImagingMember
Corporate    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related charges, net $ 0.4mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ 0mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember