Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 11, 2020	Jul. 13, 2019	Jul. 11, 2020	Jul. 13, 2019
Defined Benefit Plan Disclosure [Line Items]
Settlement and curtailment loss			$ 116,207
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 197	$ 163	462	$ 378
Interest cost	228	2,752	1,651	6,425
Expected return on plan assets	(415)	(3,957)	(3,104)	(9,233)
Settlement and curtailment loss			116,207
Amortization of prior service cost (credit)	13	89	88	208
Amortization of net (gain) loss	126	1,638	1,493	3,822
Total net periodic pension cost (income)	149	685	116,797	1,600
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	65	65	152	153
Interest cost	46	69	106	160
Amortization of prior service cost (credit)	(1)	(9)	(2)	(22)
Amortization of net (gain) loss	(69)	(63)	(161)	(149)
Total net periodic pension cost (income)	$ 41	$ 62	$ 95	$ 142