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Associate Retirement Plans - Components of Net Periodic Pension and Postretirement Benefit Cost (Income) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 2,283 $ 2,345 $ 2,977
Expected return on plan assets (3,631) (3,836) (4,269)
Recognized actuarial net loss 417 221 706
Net periodic benefit (income) cost (931) (1,270) (586)
Settlement expense 785 548 692
Total net periodic benefit (income) cost $ (146) $ (722) $ 106
Weighted average assumptions at measurement date:      
Discount rate 3.45% 3.82% 4.04%
Expected return on plan assets 4.84% 4.83% 5.05%
Retiree Medical Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 195 $ 184 $ 187
Interest cost 339 345 345
Amortization of prior service cost (158) (158) (158)
Recognized actuarial net loss 88 59 42
Net periodic benefit (income) cost 464 430 416
Total net periodic benefit (income) cost $ 464 $ 430 $ 416
Weighted average assumptions at measurement date:      
Discount rate 3.72% 4.26% 4.55%