Acquisitions and License Agreements (Schedule of Intangible Assets Acquired) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
Aug. 14, 2014	Mar. 19, 2014
Questcor Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets acquired	$ 5,601.1
Questcor Pharmaceuticals, Inc. \| Trademarks
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets acquired	5.2
Intangible assets acquired, amortization period	13 years
Questcor Pharmaceuticals, Inc. \| Customer Relationships
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets acquired	34.3
Intangible assets acquired, amortization period	12 years
H. P. Acthar Gel \| Questcor Pharmaceuticals, Inc. \| Completed Technology
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets acquired	5,343.3
Intangible assets acquired, amortization period	18 years
Ofirmev \| Cadence Pharmaceuticals, Inc. \| Completed Technology
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets acquired		1,300.0
Intangible assets acquired, amortization period		8 years
In-process Research and Development \| Synacthen \| Questcor Pharmaceuticals, Inc.
Intangible Assets Acquired as Part of Business Combination [Line Items]
Intangible assets acquired, non-amortizable	$ 218.3

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

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

+ References

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mnk_QuestcorPharmaceuticalsInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_InProcessResearchAndDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=mnk_H.P.ActharGelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=mnk_OfirmevMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: