Commitments and Contingencies (Narrative) (Details) $ in Millions			1 Months Ended	3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Apr. 01, 2014 USD ($) Defendent	Sep. 26, 2012 action	Aug. 31, 2012 principal	Sep. 29, 2017 USD ($)	Jun. 30, 2017 USD ($) Case	Jun. 24, 2016 USD ($)	Jun. 30, 2017 USD ($) Defendent Case order	Jun. 24, 2016 USD ($)	Jun. 26, 2015 USD ($)	Sep. 25, 2015 USD ($)	Dec. 30, 2016 USD ($)	Mar. 27, 2015 USD ($)	Mar. 28, 2014 USD ($)	Aug. 31, 2013 Case
Loss Contingencies [Line Items]
Environmental liabilities					$ 75.9		$ 75.9
Deferred tax liabilities related to installment sales					1,781.7		1,781.7
Section 453(a) interest					17.8	$ 18.6	36.2	$ 37.7
Interest Payable, Installment Sales					38.8		$ 38.8				$ 30.3
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent	70						98
Environmental liabilities												$ 13.3	$ 23.1
Remedial cost, estimate	$ 1,700.0				$ 1,380.0		$ 1,380.0
Asbestos Matters
Loss Contingencies [Line Items]
Pending claims | Case					11,600		11,600
Estimation of liability, historical term							5 years
Estimation of liability, expected future term of claims							7 years
Accrued and other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current					$ 2.3		$ 2.3
Questcor Acquisition of Synacthen [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense							$ 102.0
Retrophin Litigation [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense										$ 15.5
Glenridge Litigation
Loss Contingencies [Line Items]
Number of defendants | principal			3
Pending claims | Case														1
Questcor Securities Litigation
Loss Contingencies [Line Items]
Subsequent actions consolidated into lawsuit | action		4
Litigation Settlement, Amount									$ 38.0
Loss Contingency Accrual									$ 38.0
Mallinckrodt Veterinary, Inc., Millsboro, Delaware [Member]
Loss Contingencies [Line Items]
Number of Administrative Orders of Consent Entered Into | order							2
Industrial Revenue Bonds
Loss Contingencies [Line Items]
Plant assets exchanged for IRBs							$ 16.0
Minimum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate					38.0		38.0
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate	365.0				483.4		483.4
Maximum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate					116.1		116.1
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate	$ 3,200.0				$ 2,700.0		$ 2,700.0
Subsequent Event [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements				$ 35.0