Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenue	$ 532,468	$ 485,398	$ 1,568,172	$ 1,441,310
Costs and Expenses:
Marketing and sales	108,608	104,263	327,056	311,507
Research and development	223,231	206,568	666,545	600,755
General and administrative	33,247	36,302	101,421	100,892
Amortization of acquired intangibles	3,470	3,453	10,618	11,145
Restructuring and other credits	(172)	(55)	(2,610)	(2,772)
Total costs and expenses	428,838	405,013	1,285,653	1,198,633
Income from operations	103,630	80,385	282,519	242,677
Interest expense	(5,177)	(6,225)	(18,821)	(18,952)
Other income, net	1,106	12,387	4,055	14,370
Income before provision for income taxes	99,559	86,547	267,753	238,095
Provision for income taxes	241	5,390	20,401	19,552
Net income	$ 99,318	$ 81,157	$ 247,352	$ 218,543
Net income per share - basic (in usd per share)	$ 0.36	$ 0.30	$ 0.90	$ 0.80
Net income per share - diluted (in usd per share)	$ 0.35	$ 0.29	$ 0.88	$ 0.78
Weighted average common shares outstanding - basic (in shares)	273,716	273,156	273,718	271,739
Weighted average common shares outstanding - diluted (in shares)	281,646	281,400	281,391	279,554
Product and maintenance
Revenue	$ 494,990	$ 451,229	$ 1,463,469	$ 1,346,483
Costs and Expenses:
Cost of sales	36,406	34,825	118,263	117,371
Services
Revenue	37,478	34,169	104,703	94,827
Costs and Expenses:
Cost of sales	$ 24,048	$ 19,657	$ 64,360	$ 59,735