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Associate Retirement Plans - Schedule of Benefit Obligations, Pension & Other Long-Term Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Fair value of plan assets:      
Balance at beginning of year $ 74,241    
Balance at end of year 1,496 $ 74,241  
Pension Plan [Member]      
Projected/Accumulated benefit obligation:      
Balance at beginning of year 73,275 80,153  
Interest cost 1,134 2,283 $ 2,345
Actuarial loss (gain) 618 (1,578)  
Benefits paid (75,027) (7,583)  
Balance at end of year   73,275 80,153
Fair value of plan assets:      
Balance at beginning of year 74,241 81,255  
Actual return (loss) on plan assets 2,282 (931)  
Company contributions   1,500  
Benefits paid (75,027) (7,583)  
Balance at end of year 1,496 74,241 81,255
Funded (unfunded) status 1,496 966  
Components of net amount recognized in financial position:      
Current assets 1,496 966  
Net asset (liability) 1,496 966  
Amounts recognized in AOCI:      
Net actuarial loss   19,885  
Accumulated other comprehensive loss   $ 19,885  
Weighted average assumptions at measurement date:      
Discount rate   3.48%  
Retiree Medical Plan [Member]      
Projected/Accumulated benefit obligation:      
Balance at beginning of year 9,443 $ 10,199  
Service cost 171 195 184
Interest cost 375 339 345
Actuarial loss (gain) 1,181 (961)  
Benefits paid (387) (329)  
Balance at end of year 10,783 9,443 10,199
Fair value of plan assets:      
Company contributions 1,800 329 387
Benefits paid (387) (329)  
Funded (unfunded) status $ (10,783) (9,443)  
Components of net amount recognized in financial position:      
Current liabilities   (437) (466)
Noncurrent liabilities   (9,006) (10,317)
Net asset (liability)   (9,443) (10,783)
Amounts recognized in AOCI:      
Net actuarial loss   629 1,809
Prior service credit   (92)  
Accumulated other comprehensive loss   $ 537 $ 1,809
Weighted average assumptions at measurement date:      
Discount rate   4.41% 3.26%
Ultimate health care cost trend rate   5.00% 4.50%