Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Revenue:
Total revenue	$ 960,606	$ 818,817	$ 2,604,144	$ 2,194,930
Cost of goods sold:
Total cost of goods sold	536,254	467,274	1,481,774	1,278,315
Gross profit	424,352	351,543	1,122,370	916,615
Operating expenses:
Research and development	139,880	121,133	406,482	356,581
Selling and marketing	104,230	95,395	305,845	281,269
General and administrative	42,695	38,212	124,092	115,594
Amortization of intangible assets	5,529	3,837	16,586	11,083
Significant asset impairments and restructuring costs	5,355	6,359	11,696	16,679
Acquisition and integration costs	1,362	1,333	4,105	1,333
Total operating expenses	299,051	266,269	868,806	782,539
Income from operations	125,301	85,274	253,564	134,076
Interest and other income (loss), net	1,050	(1,543)	5,059	1,328
Interest expense	(9,404)	(13,611)	(28,316)	(40,376)
Income before income taxes	116,947	70,120	230,307	95,028
Provision for income taxes	30,198	19,280	57,204	503,695
Net income (loss)	$ 86,749	$ 50,840	$ 173,103	$ (408,667)
Basic net income (loss) per common share (in dollars per share)	$ 0.56	$ 0.35	$ 1.11	$ (2.84)
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.55	$ 0.34	$ 1.10	$ (2.84)
Weighted average basic common shares outstanding (in shares)	155,488	143,400	156,013	143,766
Weighted average dilutive potential common shares outstanding (in shares)	157,455	159,998	157,949	143,766
Products
Revenue:
Total revenue	$ 810,588	$ 691,758	$ 2,163,808	$ 1,821,593
Cost of goods sold:
Total cost of goods sold	454,921	399,886	1,246,413	1,085,574
Services
Revenue:
Total revenue	150,018	127,059	440,336	373,337
Cost of goods sold:
Total cost of goods sold	$ 81,333	$ 67,388	$ 235,361	$ 192,741