Background and Basis of Presentation (Details)	Dec. 26, 2014 Country
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of countries in which entity has a commercial presence	65

Number of Countries in which Entity has Sales Presence

No definition available.

Name:	mnk_NumberofCountriesinwhichEntityhasSalesPresence
Namespace Prefix:	mnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant