Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	4 Months Ended
	Apr. 23, 2022	Apr. 24, 2021
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 366	$ 299
Interest cost	272	233
Expected return on plan assets	(577)	(575)
Amortization of prior service cost (credit)	17	18
Amortization of net (gain) loss	142	229
Total net periodic pension cost (income)	220	204
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	66	103
Interest cost	34	36
Amortization of prior service cost (credit)	(72)	(1)
Amortization of net (gain) loss	(54)	(65)
Total net periodic pension cost (income)	$ (26)	$ 73