Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 30, 2019 USD ($) sites	Dec. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Document Period End Date	Mar. 30, 2019
Superfund Sites | sites	28
Environmental remediation. Period construction of treatment facility to be maintained	30 years
Kerr McGee Chemical Site [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	$ 68.7
Environmental remediation costs, reserve	27.4
Centredale Site [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	143.0
Environmental remediation costs, reserve			$ 77.7
Property, Plant and Equipment, Other Types
Loss Contingencies [Line Items]
Environmental remediation costs, reserve	246.2	$ 246.6
Reserve for environmental remediation costs, current	60.7
Reserve for environmental remediation costs, noncurrent	185.5
Accrual for Environmental Loss Contingencies, EPA Funded Amount	12.4
Accrual for Environmental Loss Contingencies, Obligation After EPA Funding	233.8
Property, Plant and Equipment, Other Types | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	213.7
Property, Plant and Equipment, Other Types | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	$ 345.2
Cargo and Freight [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 50.8