Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 13, 2019	Jul. 14, 2018	Jul. 13, 2019	Jul. 14, 2018
Defined Benefit Plan Disclosure [Line Items]
Settlement loss		$ 1,035,000	$ 0	$ 5,703,000
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 163,000	216,000	378,000	504,000
Interest cost	2,752,000	3,123,000	6,425,000	6,247,000
Expected return on plan assets	(3,957,000)	(4,678,000)	(9,233,000)	(10,085,000)
Settlement loss		1,035,000		5,703,000
Amortization of prior service cost (credit)	89,000	95,000	208,000	195,000
Amortization of net (gain) loss	1,638,000	1,256,000	3,822,000	2,829,000
Total net periodic pension cost (income)	685,000	1,047,000	1,600,000	5,393,000
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	65,000	66,000	153,000	155,000
Interest cost	69,000	54,000	160,000	127,000
Amortization of prior service cost (credit)	(9,000)	(49,000)	(22,000)	(114,000)
Amortization of net (gain) loss	(63,000)	(99,000)	(149,000)	(232,000)
Total net periodic pension cost (income)	$ 62,000	$ (28,000)	$ 142,000	$ (64,000)