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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. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 1,134 $ 2,283 $ 2,345
Expected return on plan assets (714) (3,631) (3,836)
Recognized actuarial net loss 691 417 221
Net periodic benefit expense (income) 1,111 (931) (1,270)
Settlement expense 18,244 785 548
Total net periodic benefit cost (income) $ 19,355 $ (146) $ (722)
Weighted average assumptions at measurement date:      
Discount rate 3.48% 3.45% 3.82%
Expected return on plan assets 2.80% 4.84% 4.83%
Retiree Medical Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 171 $ 195 $ 184
Interest cost 375 339 345
Amortization of prior service cost (92) (158) (158)
Recognized actuarial net loss   88 59
Net periodic benefit expense (income) 454 464 430
Total net periodic benefit cost (income) $ 454 $ 464 $ 430
Weighted average assumptions at measurement date:      
Discount rate 4.41% 3.72% 4.26%