Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 16, 2022	Jul. 17, 2021	Jul. 16, 2022	Jul. 17, 2021
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 274	$ 224	$ 640	$ 523
Interest cost	204	175	476	408
Expected return on plan assets	(432)	(431)	(1,009)	(1,006)
Amortization of prior service cost (credit)	13	13	30	31
Amortization of net (gain) loss	107	171	(249)	(400)
Total net periodic pension cost (income)	166	152	386	356
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	49	78	115	181
Interest cost	26	28	60	64
Amortization of prior service cost (credit)	(54)	(1)	(126)	(2)
Amortization of net (gain) loss	(41)	(48)	(96)	(113)
Total net periodic pension cost (income)	$ (20)	$ 57	$ (47)	$ 130