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Associate Retirement Plans - Schedule of Benefit Obligations, Pension & Postretirement Benefit Plans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Fair value of plan assets:      
Balance at beginning of year $ 81,255    
Balance at end of year 74,241 $ 81,255  
Components of net amount recognized in financial position:      
Noncurrent liabilities (15,016) (15,687)  
Pension Plan [Member]      
Projected/Accumulated benefit obligation:      
Balance at beginning of year 80,153 80,350  
Interest cost 2,283 2,345 $ 2,977
Actuarial (gain) loss (1,578) 4,662  
Benefits paid (7,583) (7,204)  
Balance at end of year 73,275 80,153 80,350
Fair value of plan assets:      
Balance at beginning of year 81,255 81,982  
Actual (loss) return on plan assets (931) 6,477  
Company contributions 1,500    
Benefits paid (7,583) (7,204)  
Balance at end of year 74,241 81,255 81,982
Funded (unfunded) status 966 1,102  
Components of net amount recognized in financial position:      
Current assets 966    
Noncurrent assets   1,102  
Net asset (liability) 966 1,102  
Amounts recognized in AOCI:      
Net actuarial loss 19,885 18,205  
Accumulated other comprehensive loss $ 19,885 $ 18,205  
Weighted average assumptions at measurement date:      
Discount rate 3.48% 3.45%  
Retiree Medical Plan [Member]      
Projected/Accumulated benefit obligation:      
Balance at beginning of year $ 10,199 $ 9,663  
Service cost 195 184 187
Interest cost 339 345 345
Actuarial (gain) loss (961) 303  
Benefits paid (329) (296)  
Balance at end of year 9,443 10,199 $ 9,663
Fair value of plan assets:      
Company contributions 329 296  
Benefits paid (329) (296)  
Funded (unfunded) status (9,443) (10,199)  
Components of net amount recognized in financial position:      
Current liabilities (437) (417)  
Noncurrent liabilities (9,006) (9,782)  
Net asset (liability) (9,443) (10,199)  
Amounts recognized in AOCI:      
Net actuarial loss 629 1,678  
Prior service credit (92) (250)  
Accumulated other comprehensive loss $ 537 $ 1,428  
Weighted average assumptions at measurement date:      
Discount rate 4.41% 3.72%  
Ultimate health care cost trend rate 5.00% 5.00%