Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Revenue:
Product and maintenance	$ 419,963	$ 384,951	$ 831,707	$ 768,588
Services	33,058	30,932	69,176	58,661
Total revenue	453,021	415,883	900,883	827,249
Costs and Expenses:
Cost of product and maintenance	42,960	31,715	87,141	73,774
Cost of services	18,823	20,040	36,696	38,566
Marketing and sales	101,110	96,662	200,310	196,930
Research and development	182,371	157,974	362,277	320,970
General and administrative	36,388	27,467	64,688	55,109
Amortization of acquired intangibles	4,537	6,119	10,317	12,350
Restructuring and other charges (credits)	(74)	(498)	14,512	3,861
Total costs and expenses	386,115	339,479	775,941	701,560
Income from operations	66,906	76,404	124,942	125,689
Interest expense	(5,896)	(8,180)	(11,253)	(19,934)
Other income, net	2,842	1,347	7,605	6,128
Income before provision for income taxes	63,852	69,571	121,294	111,883
Provision for income taxes	14,517	11,411	21,397	17,464
Net income	$ 49,335	$ 58,160	$ 99,897	$ 94,419
Net income per share - basic (in usd per share)	$ 0.17	$ 0.20	$ 0.34	$ 0.33
Net income per share - diluted (in usd per share)	$ 0.17	$ 0.19	$ 0.33	$ 0.30
Weighted average common shares outstanding - basic (in shares)	288,191	285,297	292,403	284,910
Weighted average common shares outstanding - diluted (in shares)	295,201	313,665	299,318	312,756