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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. 31, 2016
Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year $ 84,753  
Balance at end of year 81,982 $ 84,753
Guaranteed annuity contract [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 16,198  
Balance at end of year 15,426 16,198
Significant unobservable inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 16,198  
Balance at end of year 15,426 16,198
Significant unobservable inputs (Level 3) [Member] | Guaranteed annuity contract [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 16,198 17,749
Purchases, sales, issuances and settlements, net (1,733) (2,227)
Interest income 631 680
Unrealized gains (losses) 330 (4)
Balance at end of year $ 15,426 $ 16,198