v3.24.1.1.u2
Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 4 Months Ended
Apr. 20, 2024
Apr. 22, 2023
Pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 224 $ 210
Interest cost 362 401
Expected return on plan assets (494) (480)
Amortization of prior service cost (credit) 18 18
Amortization of net (gain) loss 13 53
Total net periodic pension cost (credit) 123 202
Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 56 55
Interest cost 70 73
Amortization of prior service cost (credit) (72) (72)
Amortization of net (gain) loss (55) (76)
Total net periodic pension cost (credit) $ (1) $ (20)