Commitments and Contingencies (Narrative) (Details) $ in Millions			3 Months Ended			12 Months Ended
	Mar. 31, 2016 Defendent	Apr. 01, 2014 USD ($) Defendent	Mar. 30, 2018 USD ($) lawsuit Case	Mar. 31, 2017 USD ($)	Dec. 30, 2016 USD ($)	Dec. 29, 2017 USD ($)	Sep. 25, 2015 order	Mar. 25, 2016 USD ($)	Mar. 27, 2015 USD ($)	Mar. 28, 2014 USD ($)
Loss Contingencies [Line Items]
Litigation Settlement, Expense					$ 102.0
Payments for Legal Settlements						$ 35.0
Environmental liabilities			$ 65.2
Deferred tax liabilities related to installment sales			554.2
Section 453(a) interest			5.6	$ 18.4
Interest Payable, Installment Sales			$ 48.6			$ 46.0
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent	98	70
Environmental liabilities									$ 13.3	$ 23.1
Remedial cost, estimate		$ 1,700.0						$ 1,380.0
Asbestos Matters
Loss Contingencies [Line Items]
Pending claims | Case			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			$ 3.3
Opioid Crisis [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit			553
Mallinckrodt Veterinary, Inc., Millsboro, Delaware [Member]
Loss Contingencies [Line Items]
Number of Administrative Orders of Consent Entered Into | order							2
Minimum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate			$ 27.2
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate		365.0							483.4
Maximum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate			$ 96.7
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate		$ 3,200.0							$ 2,700.0