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Associate Retirement Plans - Schedule of Benefit Obligations, Pension & Other Long-Term Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Pension Plan [Member]      
Projected/Accumulated benefit obligation:      
Balance at beginning of year   $ 73,275  
Interest cost   1,134 $ 2,283
Actuarial loss   618  
Benefits paid   (75,027)  
Balance at end of year     73,275
Fair value of plan assets:      
Balance at beginning of year $ 1,496 74,241  
Actual return on plan assets   2,282  
Refund from annuity provider 1,193    
Benefits paid   (75,027)  
Balance at end of year 2,689 1,496 74,241
Funded (unfunded) status 2,689 1,496  
Components of net amount recognized in financial position:      
Current assets 2,689 1,496  
Net asset (liability) 2,689 1,496  
Retiree Medical Plan [Member]      
Projected/Accumulated benefit obligation:      
Balance at beginning of year 10,783 9,443  
Service cost 182 171 195
Interest cost 303 375 339
Actuarial loss 1,027 1,181  
Benefits paid (386) (387)  
Balance at end of year 11,909 10,783 $ 9,443
Fair value of plan assets:      
Company contributions 386 387  
Benefits paid (386) (387)  
Funded (unfunded) status (11,909) (10,783)  
Components of net amount recognized in financial position:      
Current liabilities (471) (466)  
Noncurrent liabilities (11,438) (10,317)  
Net asset (liability) (11,909) (10,783)  
Amounts recognized in AOCI:      
Net actuarial loss 2,732 1,809  
Accumulated other comprehensive loss $ 2,732 $ 1,809  
Weighted average assumptions at measurement date:      
Discount rate 2.57% 3.26%  
Ultimate health care cost trend rate 4.50% 4.50%