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Segment Information, Operations By Geographic Area And Customer Concentration (Schedule Of Reportable Segment And Reconciliation Of Segment Contribution Income To Income Before Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 01, 2012
Apr. 03, 2011
Segment Reporting Information [Line Items]    
Total net revenues $ 325,620 $ 278,823
Total segment contribution income 52,047 45,840
Corporate and unallocated costs (11,363) (10,612)
Amortization of intangible assets (947) (1,357)
Stock-based compensation expense (3,392) (3,372)
Acquisition related compensation 0 (20)
Litigation reserves, net (151) 53
Interest income 119 129
Other income (expense), net (601) (330)
Income before income taxes 35,712 30,331
Retail [Member]
   
Segment Reporting Information [Line Items]    
Total net revenues 128,977 117,125
Total segment contribution income 26,272 19,878
Segment contribution margin 20.40% 17.00%
Commercial [Member]
   
Segment Reporting Information [Line Items]    
Total net revenues 74,632 79,622
Total segment contribution income 12,845 17,581
Segment contribution margin 17.20% 22.10%
Service Provider [Member]
   
Segment Reporting Information [Line Items]    
Total net revenues 122,011 82,076
Total segment contribution income $ 12,930 $ 8,381
Segment contribution margin 10.60% 10.20%