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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
Jan. 02, 2016
Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year $ 93,718  
Plan assets at fair value at end of year 84,753 $ 93,718
Guaranteed annuity contract [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 17,749  
Plan assets at fair value at end of year 16,198 17,749
Significant unobservable inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 17,749  
Plan assets at fair value at end of year 16,198 17,749
Significant unobservable inputs (Level 3) [Member] | Guaranteed annuity contract [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 17,749 18,071
Purchases, sales, issuances and settlements, net (2,227) (1,402)
Interest income 680 799
Unrealized (losses) gains (4) 281
Plan assets at fair value at end of year $ 16,198 $ 17,749