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Associate Retirement Plans - Summary of Reconciliation of Beginning and Ending Balances for Level 3 Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year $ 74,241  
Balance at end of year 1,496 $ 74,241
Guaranteed annuity contracts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 12,549 13,891
Purchases, sales, issuances and settlements, net (13,112) (1,712)
Interest income 349 588
Unrealized loss (gains) $ 214 (218)
Balance at end of year   $ 12,549
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]   us-gaap:FairValueInputsLevel3Member