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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 30, 2016
Assets    
Money market securities [1] $ 9,259 $ 21,918
Total 129,692 128,940
Liabilities    
Deferred compensation plan [2] 54,082 53,617
Total 54,082 53,617
Fixed income securities    
Assets    
Fixed income available-for-sale securities [3] 71,763 58,755
Fixed income trading securities held in deferred compensation plan [4] 14,033 11,872
Equity securities    
Assets    
Equity trading securities held in deferred compensation plan [4] 34,637 36,395
Fair Value, Inputs, Level 1    
Assets    
Money market securities [1] 9,259 21,918
Total 57,929 70,185
Liabilities    
Deferred compensation plan [2] 54,082 53,617
Total 54,082 53,617
Fair Value, Inputs, Level 1 | Fixed income securities    
Assets    
Fixed income available-for-sale securities [3] 0 0
Fixed income trading securities held in deferred compensation plan [4] 14,033 11,872
Fair Value, Inputs, Level 1 | Equity securities    
Assets    
Equity trading securities held in deferred compensation plan [4] 34,637 36,395
Fair Value, Inputs, Level 2    
Assets    
Money market securities [1] 0 0
Total 71,763 58,755
Liabilities    
Deferred compensation plan [2] 0 0
Total 0 0
Fair Value, Inputs, Level 2 | Fixed income securities    
Assets    
Fixed income available-for-sale securities [3] 71,763 58,755
Fixed income trading securities held in deferred compensation plan [4] 0 0
Fair Value, Inputs, Level 2 | Equity securities    
Assets    
Equity trading securities held in deferred compensation plan [4] 0 0
Fair Value, Inputs, Level 3    
Assets    
Money market securities [1] 0 0
Total 0 0
Liabilities    
Deferred compensation plan [2] 0 0
Total 0 0
Fair Value, Inputs, Level 3 | Fixed income securities    
Assets    
Fixed income available-for-sale securities [3] 0 0
Fixed income trading securities held in deferred compensation plan [4] 0 0
Fair Value, Inputs, Level 3 | Equity securities    
Assets    
Equity trading securities held in deferred compensation plan [4] $ 0 $ 0
[1] Included in cash and cash equivalents on the Company’s unaudited condensed consolidated balance sheet.
[2] Included in accrued payroll and employee benefits and deferred compensation on the Company’s unaudited condensed consolidated balance sheet.
[3] Included in short-term investments on the Company’s unaudited condensed consolidated balance sheet.
[4] Included in prepaid expenses and other assets and deferred compensation plan assets on the Company’s unaudited condensed consolidated balance sheet.