Recent Accounting Pronouncements - Components of Net Periodic Pension and Postretirement Benefits Credit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 14, 2018	Jul. 15, 2017	Jul. 14, 2018	Jul. 15, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	$ 488,871	$ 468,246	$ 1,113,993	$ 1,076,314
Selling, distribution and administrative expenses	360,365	355,542	814,828	818,608
Income from operations	52,264	68,723	128,879	166,925
Other components of net periodic pension and postretirement benefits credit	$ (298)	(1,443)	$ (1,033)	(3,366)
As reported
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)		468,152		1,076,093
Selling, distribution and administrative expenses		354,193		815,463
Income from operations		$ 70,166		$ 170,291