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Cash, Cash Equivalents And Short Term Investments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 04, 2014
Jan. 03, 2014
Fair Value Measurements [Line Items]    
Amortized Cost $ 137,412 $ 156,103
Unrealized Gains 43 25
Unrealized Losses (3) (9)
Estimated Fair Value 137,452 156,119
Cash
    
Fair Value Measurements [Line Items]    
Amortized Cost 67,274 85,849
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 67,274 85,849
Money market securities
    
Fair Value Measurements [Line Items]    
Amortized Cost 38,347 37,099
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 38,347 37,099
Total cash equivalents
    
Fair Value Measurements [Line Items]    
Amortized Cost 38,347 37,099
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 38,347 37,099
Total cash and cash equivalents
    
Fair Value Measurements [Line Items]    
Amortized Cost 105,621 122,948
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 105,621 122,948
State and municipal bonds
    
Fair Value Measurements [Line Items]    
Amortized Cost 31,791 33,155
Unrealized Gains 43 25
Unrealized Losses (3) (9)
Estimated Fair Value 31,831 33,171
Total short-term investments
    
Fair Value Measurements [Line Items]    
Amortized Cost 31,791 33,155
Unrealized Gains 43 25
Unrealized Losses (3) (9)
Estimated Fair Value $ 31,831 $ 33,171