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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. 29, 2018
Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year $ 81,255  
Balance at end of year 74,241 $ 81,255
Guaranteed annuity contracts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 13,891 15,426
Purchases, sales, issuances and settlements, net (1,712) (2,222)
Interest income 588 552
Unrealized gains (218) 135
Balance at end of year $ 12,549 $ 13,891
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueInputsLevel3Member us-gaap:FairValueInputsLevel3Member