Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Revenue:
Product and maintenance	$ 384,951	$ 354,468	$ 768,588	$ 711,818
Services	30,932	24,320	58,661	45,520
Total revenue	415,883	378,788	827,249	757,338
Costs and Expenses:
Cost of product and maintenance	31,715	37,707	73,774	79,904
Cost of services	20,040	16,706	38,566	31,608
Marketing and sales	96,662	98,611	196,930	196,934
Research and development	157,974	152,672	320,970	299,138
General and administrative	27,467	32,042	55,109	60,786
Amortization of acquired intangibles	6,119	5,579	12,350	10,789
Restructuring and other charges (credits)	(498)	(26)	3,861	370
Total costs and expenses	339,479	343,291	701,560	679,529
Income from operations	76,404	35,497	125,689	77,809
Interest expense	(8,180)	(7,369)	(19,934)	(14,637)
Other income, net	1,347	1,635	6,128	5,017
Income before provision for income taxes	69,571	29,763	111,883	68,189
Provision for income taxes	11,411	6,500	17,464	11,856
Net income	$ 58,160	$ 23,263	$ 94,419	$ 56,333
Net income per share - basic (in usd per share)	$ 0.20	$ 0.08	$ 0.33	$ 0.20
Net income per share - diluted (in usd per share)	$ 0.19	$ 0.08	$ 0.30	$ 0.19
Weighted average common shares outstanding - basic (in shares)	285,297	283,344	284,910	282,480
Weighted average common shares outstanding - diluted (in shares)	313,665	305,755	312,756	303,395