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License of Intellectual Property (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Gains on divestiture and license $ 0.8mnk_GainonDivestiture $ 12.9mnk_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