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License of Intellectual Property (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gains on divestiture and license $ 0.9mnk_GainonDivestiture $ 0.9mnk_GainonDivestiture $ 1.7mnk_GainonDivestiture $ 13.8mnk_GainonDivestiture
Oxymorphone ER        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Upfront cash received       4.0us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ProductOrServiceAxis
= mnk_OxymorphoneERMember
Contractually obligated future cash receipts       8.0mnk_ContractuallyObligatedFutureProceedsfromSaleOfProductiveAssets
/ us-gaap_ProductOrServiceAxis
= mnk_OxymorphoneERMember
Gains on divestiture and license       $ 11.7mnk_GainonDivestiture
/ us-gaap_ProductOrServiceAxis
= mnk_OxymorphoneERMember