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Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 4 Months Ended
Apr. 22, 2023
Apr. 23, 2022
Pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 210 $ 366
Interest cost 401 272
Expected return on plan assets (480) (577)
Amortization of prior service cost (credit) 18 17
Amortization of net (gain) loss 53 142
Total net periodic pension cost (income) 202 220
Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 55 66
Interest cost 73 34
Amortization of prior service cost (credit) (72) (72)
Amortization of net (gain) loss (76) (54)
Total net periodic pension cost (income) $ (20) $ (26)