Condensed Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Revenue:
Product and maintenance	$ 354,468	$ 337,983	$ 711,818	$ 666,254
Services	24,320	24,498	45,520	50,493
Total revenue	378,788	362,481	757,338	716,747
Costs and Expenses:
Cost of product and maintenance	37,707	28,095	79,904	57,942
Cost of services	16,706	15,148	31,608	33,492
Marketing and sales	98,611	95,277	196,934	185,679
Research and development	152,672	136,395	299,138	260,479
General and administrative	32,042	34,441	60,786	64,251
Amortization of acquired intangibles	5,579	5,327	10,789	9,118
Restructuring and other charges (credits)	(26)	2,656	370	2,508
Total costs and expenses	343,291	317,339	679,529	613,469
Income from operations	35,497	45,142	77,809	103,278
Interest expense	(7,369)	(9,528)	(14,637)	(18,790)
Other income, net	1,635	2,018	5,017	4,193
Income before provision for income taxes	29,763	37,632	68,189	88,681
Provision for income taxes	6,500	28,203	11,856	643
Net income	$ 23,263	$ 9,429	$ 56,333	$ 88,038
Net income per share - basic (in usd per share)	$ 0.08	$ 0.03	$ 0.20	$ 0.32
Net income per share - diluted (in usd per share)	$ 0.08	$ 0.03	$ 0.19	$ 0.30
Weighted average common shares outstanding - basic (in shares)	283,344	277,146	282,480	276,018
Weighted average common shares outstanding - diluted (in shares)	305,755	294,443	303,395	293,274