Shareholders' Equity (Summary Of Stock-Based Compensation Expense, Net Of Tax) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Stockholders Equity [Line Items]
Total stock-based compensation expense	$ 7,684	$ 7,105	$ 23,628	$ 21,033
Cost Of Sales [Member]
Stockholders Equity [Line Items]
Total stock-based compensation expense	502	491	1,480	1,461
Research And Development Expense [Member]
Stockholders Equity [Line Items]
Total stock-based compensation expense	1,163	1,151	3,869	3,373
Selling And Marketing Expense [Member]
Stockholders Equity [Line Items]
Total stock-based compensation expense	1,616	1,672	5,244	4,966
General And Administrative [Member]
Stockholders Equity [Line Items]
Total stock-based compensation expense	4,403	3,791	13,035	11,233
Total Operating Expenses [Member]
Stockholders Equity [Line Items]
Total stock-based compensation expense	$ 7,182	$ 6,614	$ 22,148	$ 19,572