Employee Stock Benefit Plans (Schedule Of Stock-Based Compensation Expense, Net Of Tax, Related To Employee Stock-Based Compensation (For All Plans)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 30, 2011		Dec. 31, 2010		Jan. 01, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 28,451		$ 23,125		$ 18,659
Tax benefit	(12,056)	[1]	(4,959)	[1]	(3,376)	[1]
Total stock-based compensation expense, net of tax	16,395		18,166		15,283
Cost Of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,955		1,816		1,854
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	4,624		3,991		3,476
Sales And Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	6,672		5,611		4,446
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	15,200		11,707		8,883
Total Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 26,496		$ 21,309		$ 16,805

[1] Tax benefit related to U.S. incentive and non-qualified stock options, employee stock purchase plan (ESPP) and restricted stock units, applying a Federal statutory and State (Federal effected) tax rate for fiscal years 2011, 2010, and 2009.