Condensed Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Revenue:
Product	$ 216,561	$ 163,966	$ 614,886	$ 463,723
Services	28,415	29,102	86,923	86,384
Maintenance	93,557	99,389	279,030	291,722
Total revenue	338,533	292,457	980,839	841,829
Costs and Expenses:
Cost of product	23,337	18,185	60,323	52,453
Cost of services	16,809	20,410	53,254	61,101
Cost of maintenance	11,124	11,223	33,756	32,837
Marketing and sales	82,461	79,914	246,674	235,292
Research and development	115,078	103,154	335,703	303,721
General and administrative	26,350	24,041	84,364	68,720
Amortization of acquired intangibles	3,876	3,786	11,305	12,750
Restructuring and other charges (credits)	57	(433)	49	277
Total costs and expenses	279,092	260,280	825,428	767,151
Income from operations	59,441	32,177	155,411	74,678
Interest expense	(8,737)	(10,830)	(25,840)	(32,584)
Other income (expense), net	(131)	7,244	5,972	20,107
Income before provision (benefit) for income taxes	50,573	28,591	135,543	62,201
Provision (benefit) for income taxes	(8,011)	485	9,469	864
Net income	$ 58,584	$ 28,106	$ 126,074	$ 61,337
Net income per share - basic (in usd per share)	$ 0.22	$ 0.11	$ 0.47	$ 0.23
Net income per share - diluted (in usd per share)	$ 0.21	$ 0.10	$ 0.45	$ 0.23
Weighted average common shares outstanding - basic (in shares)	271,350	264,723	269,643	263,149
Weighted average common shares outstanding - diluted (in shares)	283,328	270,741	278,760	270,068