Condensed Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Revenue:
Product and maintenance	$ 337,983	$ 297,510	$ 666,254	$ 583,798
Service	24,498	28,966	50,493	58,508
Total revenue	362,481	326,476	716,747	642,306
Costs and Expenses:
Cost of product and maintenance	28,095	32,406	57,942	59,618
Cost of service	15,148	17,071	33,492	36,445
Marketing and sales	95,277	80,418	185,679	164,213
Research and development	136,395	112,031	260,479	220,625
General and administrative	34,441	30,244	64,251	58,014
Amortization of acquired intangibles	5,327	3,643	9,118	7,429
Restructuring and other charges (credits)	2,656	43	2,508	(8)
Total costs and expenses	317,339	275,856	613,469	546,336
Income from operations	45,142	50,620	103,278	95,970
Interest expense	(9,528)	(8,566)	(18,790)	(17,103)
Other income, net	2,018	3,669	4,193	6,103
Income before provision for income taxes	37,632	45,723	88,681	84,970
Provision for income taxes	28,203	9,337	643	17,480
Net income	$ 9,429	$ 36,386	$ 88,038	$ 67,490
Net income per share - basic (in usd per share)	$ 0.03	$ 0.13	$ 0.32	$ 0.25
Net income per share - diluted (in usd per share)	$ 0.03	$ 0.13	$ 0.30	$ 0.24
Weighted average common shares outstanding - basic (in shares)	277,146	269,739	276,018	268,840
Weighted average common shares outstanding - diluted (in shares)	294,443	275,318	293,274	276,526