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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 6 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Mar. 27, 2015
Mar. 28, 2014
Restructuring Cost and Reserve [Line Items]        
Restructuring and related charges, net $ 3.8mnk_TotalRestructuringAndRelatedExpense $ 21.7mnk_TotalRestructuringAndRelatedExpense $ 11.1mnk_TotalRestructuringAndRelatedExpense $ 29.8mnk_TotalRestructuringAndRelatedExpense
Less: accelerated depreciation (0.1)us-gaap_RestructuringReserveAcceleratedDepreciation 0us-gaap_RestructuringReserveAcceleratedDepreciation (0.2)us-gaap_RestructuringReserveAcceleratedDepreciation (0.1)us-gaap_RestructuringReserveAcceleratedDepreciation
Restructuring charges, net 3.7us-gaap_RestructuringCharges 21.7us-gaap_RestructuringCharges 10.9us-gaap_RestructuringCharges 29.7us-gaap_RestructuringCharges
Specialty Brands        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related charges, net 0.9mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyBrandsMember
2.1mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyBrandsMember
15.1mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyBrandsMember
2.1mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyBrandsMember
Specialty Generics        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related charges, net 2.7mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyGenericsMember
0.6mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyGenericsMember
2.7mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyGenericsMember
0.6mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_SpecialtyGenericsMember
Global Medical Imaging        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related charges, net 0.2mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_GlobalMedicalImagingMember
18.5mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_GlobalMedicalImagingMember
(7.1)mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_GlobalMedicalImagingMember
26.6mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mnk_GlobalMedicalImagingMember
Corporate        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related charges, net $ 0mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ 0.5mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ 0.4mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ 0.5mnk_TotalRestructuringAndRelatedExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember