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Cash, Cash Equivalents And Short Term Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 04, 2014
Jan. 03, 2014
Fair Value Measurements [Line Items]    
Amortized Cost $ 144,489 $ 156,103
Unrealized Gains 53 25
Unrealized Losses 0 (9)
Estimated Fair Value 144,542 156,119
Cash
    
Fair Value Measurements [Line Items]    
Amortized Cost 74,174 85,849
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 74,174 85,849
Money market securities
    
Fair Value Measurements [Line Items]    
Amortized Cost 38,721 37,099
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 38,721 37,099
Total cash equivalents
    
Fair Value Measurements [Line Items]    
Amortized Cost 38,721 37,099
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 38,721 37,099
Total cash and cash equivalents
    
Fair Value Measurements [Line Items]    
Amortized Cost 112,895 122,948
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 112,895 122,948
State and municipal bonds
    
Fair Value Measurements [Line Items]    
Amortized Cost 31,594 33,155
Unrealized Gains 53 25
Unrealized Losses 0 (9)
Estimated Fair Value 31,647 33,171
Total short-term investments
    
Fair Value Measurements [Line Items]    
Amortized Cost 31,594 33,155
Unrealized Gains 53 25
Unrealized Losses 0 (9)
Estimated Fair Value $ 31,647 $ 33,171