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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
Sep. 28, 2012
Dec. 30, 2011
Fixed income securities
   
Assets    
Fixed income available for sale securities $ 22,086,000 $ 25,260,000
Fair Value, Measurements, Recurring
   
Assets    
Money market securities 48,018,000 [1] 44,448,000 [2]
Total 96,689,000 89,790,000
Liabilities    
Deferred compensation plan 26,468,000 [3] 19,927,000 [4]
Total 26,468,000 19,927,000
Fair Value, Measurements, Recurring | Fixed income securities
   
Assets    
Fixed income available for sale securities 22,086,000 [5] 25,260,000 [6]
Fixed income trading securities held in deferred compensation plan 9,652,000 [7] 7,456,000 [8]
Fair Value, Measurements, Recurring | Equity securities
   
Assets    
Equity trading securities held in deferred compensation plan 16,933,000 [7] 12,626,000 [8]
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
   
Assets    
Money market securities 48,018,000 [1] 44,448,000 [2]
Total 74,603,000 64,530,000
Liabilities    
Deferred compensation plan 26,468,000 [3] 19,927,000 [4]
Total 26,468,000 19,927,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Fixed income securities
   
Assets    
Fixed income trading securities held in deferred compensation plan 9,652,000 [7] 7,456,000 [8]
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Equity securities
   
Assets    
Equity trading securities held in deferred compensation plan 16,933,000 [7] 12,626,000 [8]
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
   
Assets    
Total 22,086,000 25,260,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed income securities
   
Assets    
Fixed income available for sale securities $ 22,086,000 [5] $ 25,260,000 [6]
[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.