Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenue:
Total revenue	$ 818,817	$ 728,719	$ 2,194,930	$ 2,057,238
Cost of goods sold:
Total cost of goods sold	467,274	400,643	1,278,315	1,137,137
Gross profit	351,543	328,076	916,615	920,101
Operating expenses:
Research and development	121,133	117,729	356,581	356,221
Selling and marketing	95,395	86,739	281,269	260,292
General and administrative	38,212	35,569	115,594	106,423
Significant asset impairments and restructuring costs	6,359	2,203	16,679	8,874
Amortization of intangible assets	3,837	3,837	11,083	29,368
Acquisition and integration costs	1,333	0	1,333	0
Total operating expenses	266,269	246,077	782,539	761,178
Income from operations	85,274	81,999	134,076	158,923
Interest and other income (loss), net	(1,543)	(848)	1,328	(3,396)
Interest expense	(13,611)	(13,415)	(40,376)	(41,926)
Income before income taxes	70,120	67,736	95,028	113,601
Provision for income taxes	19,280	7,726	503,695	11,704
Net income (loss)	$ 50,840	$ 60,010	$ (408,667)	$ 101,897
Basic net income (loss) per common share (in dollars per share)	$ 0.35	$ 0.42	$ (2.84)	$ 0.72
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.34	$ 0.39	$ (2.84)	$ 0.69
Weighted average basic common shares outstanding (in shares)	143,400	142,464	143,766	141,631
Weighted average dilutive potential common shares outstanding (in shares)	159,998	172,112	143,766	164,431
Products
Revenue:
Total revenue	$ 691,758	$ 610,742	$ 1,821,593	$ 1,702,365
Cost of goods sold:
Total cost of goods sold	399,886	341,197	1,085,574	955,303
Services
Revenue:
Total revenue	127,059	117,977	373,337	354,873
Cost of goods sold:
Total cost of goods sold	$ 67,388	$ 59,446	$ 192,741	$ 181,834