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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Sep. 27, 2013
Dec. 28, 2012
Assets    
Money market securities $ 56,938 [1] $ 49,134 [2]
Total 105,733 97,104
Liabilities    
Deferred compensation plan 35,431 [3] 26,984 [4]
Total 35,431 26,984
Fixed income securities
    
Assets    
Fixed income available for sale securities 13,296 [5] 20,881 [6]
Fixed income trading securities held in deferred compensation plan 9,921 [7] 9,911 [8]
Equity securities
    
Assets    
Equity trading securities held in deferred compensation plan 25,578 [7] 17,178 [8]
Fair Value, Inputs, Level 1
    
Assets    
Money market securities 56,938 [1] 49,134 [2]
Total 92,437 76,223
Liabilities    
Deferred compensation plan 35,431 [3] 26,984 [4]
Total 35,431 26,984
Fair Value, Inputs, Level 1 | Fixed income securities
    
Assets    
Fixed income available for sale securities 0 [5] 0 [6]
Fixed income trading securities held in deferred compensation plan 9,921 [7] 9,911 [8]
Fair Value, Inputs, Level 1 | Equity securities
    
Assets    
Equity trading securities held in deferred compensation plan 25,578 [7] 17,178 [8]
Fair Value, Inputs, Level 2
    
Assets    
Money market securities 0 [1] 0 [2]
Total 13,296 20,881
Liabilities    
Deferred compensation plan 0 [3] 0 [4]
Total 0 0
Fair Value, Inputs, Level 2 | Fixed income securities
    
Assets    
Fixed income available for sale securities 13,296 [5] 20,881 [6]
Fixed income trading securities held in deferred compensation plan 0 [7] 0 [8]
Fair Value, Inputs, Level 2 | Equity securities
    
Assets    
Equity trading securities held in deferred compensation plan 0 [7] 0 [8]
Fair Value, Inputs, Level 3
    
Assets    
Money market securities 0 [1] 0 [2]
Total 0 0
Liabilities    
Deferred compensation plan 0 [3] 0 [4]
Total 0 0
Fair Value, Inputs, Level 3 | Fixed income securities
    
Assets    
Fixed income available for sale securities 0 [5] 0 [6]
Fixed income trading securities held in deferred compensation plan 0 [7] 0 [8]
Fair Value, Inputs, Level 3 | Equity securities
    
Assets    
Equity trading securities held in deferred compensation plan $ 0 [7] $ 0 [8]
[1] Included in cash and cash equivalents on the Company’s unaudited condensed consolidated balance sheet.
[2] Included in cash and cash equivalents on the Company’s consolidated balance sheet.
[3] Included in accrued liabilities and deferred compensation on the Company’s unaudited condensed consolidated balance sheet.
[4] Included in accrued liabilities and deferred compensation on the Company’s consolidated balance sheet.
[5] Included in short-term investments on the Company’s unaudited condensed consolidated balance sheet.
[6] Included in short-term investments on the Company’s consolidated balance sheet.
[7] Included in other current assets and deferred compensation plan assets on the Company’s unaudited condensed consolidated balance sheet.
[8] Included in other current assets and deferred compensation plan assets on the Company’s consolidated balance sheet.