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Associate Retirement Plans - Summary of Fair Value Pension Plan Asset (Detail) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total fair value $ 81,255 $ 81,982  
Total net asset value 66,327 64,684  
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value 1,037 1,872  
Significant unobservable inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value 13,891 15,426  
Mutual funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value 18,194 14,178  
Total net asset value 18,194 14,178  
Pooled funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value 48,133 50,506  
Total net asset value 48,133 50,506  
Money market fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value 1,037 1,872  
Money market fund [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value 1,037 1,872  
Guaranteed annuity contract [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value 13,891 15,426  
Guaranteed annuity contract [Member] | Significant unobservable inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total fair value $ 13,891 $ 15,426 $ 16,198