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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
Dec. 28, 2012
Dec. 30, 2011
Assets    
Money market securities $ 49,134 [1] $ 44,448 [1]
Total 97,104 89,790
Liabilities    
Deferred compensation plan 26,984 [2] 19,927 [2]
Total 26,984 19,927
Fixed income securities
   
Assets    
Fixed income available for sale securities 20,881 [3] 25,260
Fixed income trading securities held in deferred compensation plan 9,911 [4] 7,456 [4]
Equity securities
   
Assets    
Equity trading securities held in deferred compensation plan 17,178 [4] 12,626 [4]
Fair Value, Inputs, Level 1
   
Assets    
Money market securities 49,134 [1] 44,448 [1]
Total 76,223 64,530
Liabilities    
Deferred compensation plan 26,984 [2] 19,927 [2]
Total 26,984 19,927
Fair Value, Inputs, Level 1 | Fixed income securities
   
Assets    
Fixed income available for sale securities 0 [3] 0
Fixed income trading securities held in deferred compensation plan 9,911 [4] 7,456 [4]
Fair Value, Inputs, Level 1 | Equity securities
   
Assets    
Equity trading securities held in deferred compensation plan 17,178 [4] 12,626 [4]
Fair Value, Inputs, Level 2
   
Assets    
Money market securities 0 [1] 0 [1]
Total 20,881 25,260
Liabilities    
Deferred compensation plan 0 [2] 0 [2]
Total   0
Fair Value, Inputs, Level 2 | Fixed income securities
   
Assets    
Fixed income available for sale securities 20,881 [3] 25,260
Fixed income trading securities held in deferred compensation plan $ 0 [4] $ 0 [4]
[1] Included in cash and cash equivalents on the Company's consolidated balance sheet.
[2] Included in accrued liabilities and deferred compensation on the Company's consolidated balance sheet.
[3] Included in short-term investments on the Company's consolidated balance sheet.
[4] Included in other current assets and deferred compensation plan assets on the Company's consolidated balance sheet.