Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Revenue:
Product and maintenance	$ 415,370	$ 396,867	$ 1,247,077	$ 1,165,455
Services	30,850	36,896	100,026	95,557
Total revenue	446,220	433,763	1,347,103	1,261,012
Costs and Expenses:
Cost of product and maintenance	38,740	41,206	125,881	114,980
Cost of services	17,867	24,005	54,563	62,571
Marketing and sales	96,793	101,950	297,103	298,880
Research and development	191,547	154,627	553,824	475,597
General and administrative	30,441	28,084	95,129	83,193
Amortization of acquired intangibles	3,889	5,687	14,206	18,037
Restructuring and other charges	101	303	14,613	4,164
Total costs and expenses	379,378	355,862	1,155,319	1,057,422
Income from operations	66,842	77,901	191,784	203,590
Interest expense	(6,053)	(4,177)	(17,306)	(24,111)
Other income, net	2,836	1,839	10,441	7,967
Income before provision (benefit) for income taxes	63,625	75,563	184,919	187,446
Provision (benefit) for income taxes	(1,087)	(2,061)	20,310	15,403
Net income	$ 64,712	$ 77,624	$ 164,609	$ 172,043
Net income per share - basic (in usd per share)	$ 0.23	$ 0.27	$ 0.57	$ 0.60
Net income per share - diluted (in usd per share)	$ 0.23	$ 0.25	$ 0.56	$ 0.55
Weighted average common shares outstanding - basic (in shares)	280,622	284,818	288,476	284,880
Weighted average common shares outstanding - diluted (in shares)	287,473	313,186	295,369	312,899