Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 29, 2019 USD ($)	Sep. 28, 2019 USD ($) sites	Sep. 29, 2018 USD ($)	Dec. 29, 2018 USD ($)
Loss Contingencies [Line Items]
Increase in lease liability		$ 90.0
Document Period End Date		Sep. 28, 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			26.4
Centredale Site [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable		$ 117.4
Environmental remediation costs, reserve			$ 77.7
Property, Plant and Equipment, Other Types
Loss Contingencies [Line Items]
Environmental remediation costs, reserve		216.6		$ 246.6
Reserve for environmental remediation costs, current		56.8
Reserve for environmental remediation costs, noncurrent		159.8
Accrual for Environmental Loss Contingencies, EPA Funded Amount	$ 15.5
Accrual for Environmental Loss Contingencies, Obligation After EPA Funding		$ 201.1
Property, Plant and Equipment, Other Types | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	152.0
Property, Plant and Equipment, Other Types | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	$ 288.9
Cargo and Freight [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual				$ 50.8