Postretirement Plans - Additional Information (Detail) - USD ($)	3 Months Ended					4 Months Ended		9 Months Ended
	Oct. 05, 2019	Jul. 13, 2019	Oct. 06, 2018	Jul. 14, 2018	Oct. 07, 2017	Apr. 20, 2019	Apr. 21, 2018	Oct. 05, 2019	Oct. 06, 2018
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined benefit plans estimated final non-cash settlement charge	$ 119,000,000.0							$ 119,000,000.0
Settlement charge			$ (930,000)					0	$ (6,633,000)
Multiemployer plan, withdrawal obligation					$ 15,200,000
Multiemployer plans, increase in withdrawal obligation							$ 2,300,000
Multiemployer plans transition payments payable	3,100,000							$ 3,100,000
Multiemployer plans payable date								Nov. 03, 2017
Multiemployer plan withdrawal liability of net present value monthly payments period					20 years
Multiemployer plan, withdrawal obligation paid							200,000
Plan No. 1
Pension and Other Postretirement Benefits Disclosure [Line Items]
Voluntarily contributions made by an employer		$ 0	100,000	$ 30,000,000.0		$ 0	$ 10,000,000.0	$ 0
Plan No. 2
Pension and Other Postretirement Benefits Disclosure [Line Items]
Voluntarily contributions made by an employer	2,500,000	$ 0	$ 600,000			$ 0
Minimum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Required cash contribution to fully fund under defined benefit plans	5,000,000.0							5,000,000.0
Maximum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Required cash contribution to fully fund under defined benefit plans	$ 35,000,000.0							$ 35,000,000.0