Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Revenue:
Total revenue	$ 865,011	$ 729,978	$ 1,643,538	$ 1,376,113
Cost of goods sold:
Total cost of goods sold	490,334	436,671	945,520	811,041
Gross profit	374,677	293,307	698,018	565,072
Operating expenses:
Research and development	137,969	116,924	266,602	235,448
Selling and marketing	103,502	97,359	201,615	185,874
General and administrative	42,154	38,976	81,397	77,382
Amortization of intangible assets	5,529	3,623	11,057	7,246
Significant asset impairments and restructuring costs	4,068	4,359	6,341	10,320
Acquisition and integration costs	1,135	0	2,743	0
Total operating expenses	294,357	261,241	569,755	516,270
Income from operations	80,320	32,066	128,263	48,802
Interest and other income (loss), net	(244)	1,296	4,009	2,871
Interest expense	(9,471)	(13,031)	(18,912)	(26,765)
Income before income taxes	70,605	20,331	113,360	24,908
Provision for income taxes	17,867	6,475	27,006	484,415
Net income (loss)	$ 52,738	$ 13,856	$ 86,354	$ (459,507)
Basic net income (loss) per common share (in dollars per share)	$ 0.34	$ 0.10	$ 0.55	$ (3.19)
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.33	$ 0.09	$ 0.55	$ (3.19)
Weighted average basic common shares outstanding (in shares)	156,170	143,975	156,244	143,948
Weighted average dilutive potential common shares outstanding (in shares)	158,289	147,973	158,211	143,948
Products
Revenue:
Total revenue	$ 710,688	$ 604,226	$ 1,353,220	$ 1,129,835
Cost of goods sold:
Total cost of goods sold	411,050	372,568	791,492	685,688
Services
Revenue:
Total revenue	154,323	125,752	290,318	246,278
Cost of goods sold:
Total cost of goods sold	$ 79,284	$ 64,103	$ 154,028	$ 125,353