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								12 Months Ended
	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Total net revenues	$ 356,620	$ 361,895	$ 357,719	$ 293,399	$ 310,436	$ 315,210	$ 320,655	$ 325,620	$ 1,369,633		$ 1,271,921		$ 1,181,018
Total segment contribution income									191,544		195,428		189,132
Corporate and unallocated costs									(51,629)		(47,766)		(43,301)
Amortization of intangible assets									(15,217)	[1]	(4,763)	[1]	(4,658)	[1]
Stock-based compensation expense									(17,462)		(14,372)		(13,762)
Restructuring and other charges									(5,335)		(1,190)		(2,094)
Acquisition-related expense									(940)	[2]	(833)	[2]	(40)	[2]
Impact to cost of sales from acquisition accounting adjustments to inventory									(568)		0		(609)
Litigation reserves, net									(5,354)		(390)		201
Impairment charges									(2,000)		0		0
Interest income									400		498		477
Other income, net									(457)		2,670		(1,136)
Income before income taxes									92,982		129,282		124,210
Retail [Member]
Segment Reporting Information [Line Items]
Total net revenues									509,924		504,797		481,795
Total segment contribution income									73,418		86,808		81,589
Segment contribution margin (in percentage)									14.40%		17.20%		16.90%
Commercial [Member]
Segment Reporting Information [Line Items]
Total net revenues									311,261		307,945		331,439
Total segment contribution income									66,506		67,826		74,746
Segment contribution margin (in percentage)									21.40%		22.00%		22.60%
Service Provider [Member]
Segment Reporting Information [Line Items]
Total net revenues									548,448		459,179		367,784
Total segment contribution income									$ 51,620		$ 40,794		$ 32,797
Segment contribution margin (in percentage)									9.40%		8.90%		8.90%

[1] Amount excludes amortization expense related to patents within purchased intangible assets in costs of revenues.

[2] These acquisition-related charges were expensed in the period incurred and reported in the Company's consolidated statements of operations within cost of revenues and operating expense.