Debt (Schedule of Maturities of Long-term Debt including Capital Lease Obligation) (Details) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013
Schedule of Maturities of Long-term Debt including Capital Lease Obligation [Abstract]
Fiscal 2014	$ 1.5
Fiscal 2015	1.4
Fiscal 2016	0.4
Fiscal 2017	0
Fiscal 2018	$ 300.0

Name:	mnk_ScheduleofMaturitiesofLongtermDebtincludingCapitalLeaseObligationAbstract
Namespace Prefix:	mnk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year.

No definition available.

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year.

No definition available.

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year.

No definition available.

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant