Commitments and Contingencies (Narrative) (Details)		1 Months Ended			9 Months Ended	12 Months Ended
	Sep. 26, 2012 action	Aug. 31, 2013 lawsuit Case	Oct. 31, 2012 action	Aug. 31, 2012 principal	Jun. 26, 2015 USD ($)	Sep. 30, 2016 USD ($) Defendent Case	Sep. 25, 2015 USD ($) Defendent order	Sep. 26, 2014 USD ($)	Apr. 11, 2014 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Plant Assets Exchanged for Industrial Revenue Bonds						$ 88,000,000
Deferred Tax Liabilities Installment Sales						1,883,700,000
Interest Expense, Installment Sales						73,800,000	$ 36,500,000
Interest Payable, Installment Sales						25,700,000
Rent expense						23,900,000	22,200,000	$ 12,200,000
Loss Contingencies [Line Items]
Environmental liabilities						75,900,000
Tax Matters Agreement | Covidien
Loss Contingencies [Line Items]
Tax agreement, tax threshold						$ 200,000,000
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent						98
Environmental liabilities						$ 13,300,000
Remedial cost, estimate						$ 1,380,000,000
Asbestos Matters
Loss Contingencies [Line Items]
Pending claims | Case						11,700
Estimation of liability, historical term					5 years
Estimation of liability, expected future term of claims					7 years
Other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current						$ 2,600,000
Retrophin Litigation [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense							$ 15,500,000
Glenridge Litigation
Loss Contingencies [Line Items]
Number of defendants | principal				3
Loss Contingency, Lawsuits, Number | lawsuit		2
Pending claims | Case		1
Questcor Securities Litigation [Member]
Loss Contingencies [Line Items]
Filed-actions consolidated into the lawsuit | action	4		5
Litigation Settlement, Amount					$ 38,000,000
Loss Contingency, Accrual, Current					$ 38,000,000
Mallinckrodt Veterinary, Inc., Millsboro, Delaware
Loss Contingencies [Line Items]
Number of Administrative Orders of Consent Entered Into | order							2
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent							70
Environmental liabilities									$ 23,100,000
Remedial cost, estimate									1,700,000,000
Tastemaker
Loss Contingencies [Line Items]
Provision for Loss (Gain) on Disposal, Net of Tax							$ (22,500,000)
Minimum
Loss Contingencies [Line Items]
Remedial cost, estimate						38,700,000
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate							483,400,000		365,000,000
Maximum
Loss Contingencies [Line Items]
Remedial cost, estimate						121,300,000
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate							$ 2,700,000,000		$ 3,200,000,000
Industrial Revenue Bonds by Saint Louis County [Member]
Loss Contingencies [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure						73,700,000
Property, Plant and Equipment, Gross, Period Increase (Decrease)						(14,300,000)
Recurring | Level 3 | Stratatech [Member]
Loss Contingencies [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability						$ 54,900,000