Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 17, 2021	Jul. 11, 2020	Jul. 17, 2021	Jul. 11, 2020
Defined Benefit Plan Disclosure [Line Items]
Settlement and curtailment loss				$ 116,207
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 224	$ 197	$ 523	462
Interest cost	175	228	408	1,651
Expected return on plan assets	(431)	(415)	(1,006)	(3,104)
Settlement and curtailment loss				116,207
Amortization of prior service cost (credit)	13	13	31	88
Amortization of net (gain) loss	171	126	400	1,493
Total net periodic pension cost (income)	152	149	356	116,797
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	78	65	181	152
Interest cost	28	46	64	106
Amortization of prior service cost (credit)	(1)	(1)	(2)	(2)
Amortization of net (gain) loss	(48)	(69)	(113)	(161)
Total net periodic pension cost (income)	$ 57	$ 41	$ 130	$ 95