Condensed Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Revenue:
Product and maintenance	$ 328,271	$ 286,288
Service	25,995	29,542
Total revenue	354,266	315,830
Costs and Expenses:
Cost of product and maintenance	29,847	27,212
Cost of service	18,344	19,374
Marketing and sales	90,402	83,795
Research and development	124,084	108,594
General and administrative	29,810	27,770
Amortization of acquired intangibles	3,791	3,786
Restructuring and other charges (credits)	(148)	(51)
Total costs and expenses	296,130	270,480
Income from operations	58,136	45,350
Interest expense	(9,262)	(8,537)
Other income, net	2,175	2,434
Income before provision (benefit) for income taxes	51,049	39,247
Provision (benefit) for income taxes	(27,560)	8,143
Net income	$ 78,609	$ 31,104
Net income per share - basic (in usd per share)	$ 0.29	$ 0.12
Net income per share - diluted (in usd per share)	$ 0.27	$ 0.11
Weighted average common shares outstanding - basic (in shares)	274,936	267,940
Weighted average common shares outstanding - diluted (in shares)	292,151	277,733