Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 15, 2023	Jul. 16, 2022	Jul. 15, 2023	Jul. 16, 2022
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 157	$ 274	$ 367	$ 640
Interest cost	301	204	702	476
Expected return on plan assets	(360)	(432)	(840)	(1,009)
Amortization of prior service cost (credit)	13	13	31	30
Amortization of net (gain) loss	40	107	93	249
Total net periodic pension cost (credit)	151	166	353	386
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	41	49	96	115
Interest cost	55	26	128	60
Amortization of prior service cost (credit)	(54)	(54)	(126)	(126)
Amortization of net (gain) loss	(57)	(41)	(133)	(96)
Total net periodic pension cost (credit)	$ (15)	$ (20)	$ (35)	$ (47)