CONTINGENCIES - Additional Information (Detail) cubic_yard in Millions, $ in Millions									1 Months Ended		9 Months Ended
	Aug. 12, 2019 USD ($)	Oct. 10, 2018 mi	Jun. 30, 2018 USD ($) Company	May 17, 2017 Hazardous_Substance	Mar. 30, 2017 Company	Mar. 31, 2016 USD ($) Company mi	Mar. 04, 2016 cubic_yard mi	Apr. 11, 2014 mi	Apr. 30, 2015 mi	May 31, 2007 Company mi	Sep. 26, 2020 USD ($) site	Dec. 28, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 29, 2018 USD ($)
Loss Contingencies [Line Items]
Superfund sites | site											28
Environmental remediation costs deemed probable and reasonably estimable						$ 1,400.0
Environmental remediation, period construction of treatment facility to be maintained											30 years
Number of miles of river | mi		9				8.3	8.3	8.3	17	17
Cubic yards of settlement | cubic_yard							3.5
Approximate implementation time						6 years
Number of other parties notified | Company						105
Number of companies offered cash out settlements | Company					20
Number of hazardous substances | Hazardous_Substance				8
Number of companies named in suit | Company			100
Estimated costs of remediation			$ 165.0
Minimum
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	$ 420.0
Maximum
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	$ 468.0
Property, Plant and Equipment, Other Types
Loss Contingencies [Line Items]
Environmental remediation costs, reserve											$ 180.2	$ 213.8
Reserve for environmental remediation costs, current											45.7
Reserve for environmental remediation costs, noncurrent											134.5
Accrual for environmental loss contingencies, EPA funded amount											15.8
Accrual for environmental loss contingencies, obligation after EPA funding											164.4
Property, Plant and Equipment, Other Types | Minimum
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable											114.1
Property, Plant and Equipment, Other Types | Maximum
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable											251.5
Centredale Site
Loss Contingencies [Line Items]
Environmental remediation costs, reserve														$ 77.7
Environmental remediation costs deemed probable and reasonably estimable											$ 80.2
Kerr McGee Chemical Site
Loss Contingencies [Line Items]
Environmental remediation costs, reserve													$ 24.7
Cargo and Freight
Loss Contingencies [Line Items]
Outstanding obligations														$ 50.8
Lower Passaic Cooperating Parties Group
Loss Contingencies [Line Items]
Number of companies | Company										47