Commitments and Contingencies (Narrative) (Details)			3 Months Ended			12 Months Ended
	Jun. 30, 2018 Defendent	Apr. 01, 2014 USD ($) Defendent	Mar. 29, 2019 USD ($) Defendent lawsuit Case	Sep. 28, 2018 USD ($)	Mar. 30, 2018 USD ($)	Dec. 28, 2018 USD ($)	Aug. 07, 2018 USD ($)	Mar. 25, 2016 USD ($)
Loss Contingencies [Line Items]
Environmental liabilities			$ 61,500,000
Deferred Tax Liabilities Installment Sales						$ 227,500,000
Increase (Decrease) Installment Note Deferred Tax Liability Resulting From Tax Reform						$ (227,500,000)
Section 453(a) interest			300,000		$ 5,600,000
Interest Payable, Installment Sales			$ 56,000,000.0
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent		70
Environmental liabilities				$ 26,200,000
Remedial cost, estimate		$ 1,700,000,000						$ 1,380,000,000
Loss Contingency, Settlement Agreement, Amount							$ 280,600
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)				$ (11,800,000)
Occidental, Lower Passaic River [Member]
Loss Contingencies [Line Items]
Number of defendants | Defendent	120
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
Accrued and other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current			$ 1,900,000
Minimum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate			36,100,000
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate		365,000,000.0
Maximum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate			$ 86,200,000
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate		$ 3,200,000,000
opioid crisis [Member] | Cities, Counties, and/or Other Government-related Persons/Entities [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit			1,780
opioid crisis [Member] | Hospitals, Health Systems, Unions, Health and Welfare Fund or Third-Party Payers [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit			122
opioid crisis [Member] | Individuals [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit			27
opioid crisis [Member] | State Attorney Generals [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit			7
U.S. House Committee Investigation [Member]
Loss Contingencies [Line Items]
Number of defendants | Defendent			11