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Equity-Based Compensation (Compensation Expense And Related Tax Benefit For Equity-Based Payments) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	$ 3,098	$ 2,499	$ 10,048	$ 6,838
Income tax benefit	1,069	862	3,467	2,359
Cost Of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	218	207	755	627
Selling And Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	333	390	1,107	936
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	343	302	1,037	963
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation	$ 2,204	$ 1,600	$ 7,149	$ 4,312

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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