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Segment Information and Operations By Geographic Area (Schedule Of Reportable Segment And Reconciliation Of Segment Contribution Income To Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 02, 2016
Sep. 27, 2015
Oct. 02, 2016
Sep. 27, 2015
Segment Reporting Information [Line Items]        
Total net revenues $ 338,458 $ 341,893 $ 960,369 $ 939,832
Total segment contribution income 56,306 49,668 162,363 123,694
Corporate and unallocated costs (17,532) (14,363) (50,666) (39,559)
Amortization of intangible assets [1] (4,165) (4,165) (12,496) (12,804)
Stock-based compensation expense (4,870) (4,111) (14,300) (12,517)
Restructuring and other charges 130 (1,016) (3,859) (6,384)
Losses on inventory commitments due to restructuring 0 0 0 (407)
Litigation reserves, net (13) 0 (58) 2,690
Interest income 291 65 804 184
Other income (expense), net 116 (199) (582) (67)
Income before income taxes 30,263 25,879 81,206 54,830
Retail [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 194,203 164,081 522,392 416,847
Total segment contribution income $ 23,218 $ 21,149 $ 73,177 $ 53,715
Segment contribution margin (in percentage) 12.00% 12.90% 14.00% 12.90%
Commercial [Member]        
Segment Reporting Information [Line Items]        
Total net revenues $ 73,405 $ 65,187 $ 215,508 $ 200,935
Total segment contribution income $ 20,216 $ 13,700 $ 53,604 $ 42,507
Segment contribution margin (in percentage) 27.50% 21.00% 24.90% 21.20%
Service Provider [Member]        
Segment Reporting Information [Line Items]        
Total net revenues $ 70,850 $ 112,625 $ 222,469 $ 322,050
Total segment contribution income $ 12,872 $ 14,819 $ 35,582 $ 27,472
Segment contribution margin (in percentage) 18.20% 13.20% 16.00% 8.50%
[1] Amount excludes amortization expense related to patents included in cost of revenue.