Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Cash flows provided by operating activities:
Net income (loss)	$ (459,507)	$ 41,887
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	41,400	35,548
Share-based compensation costs	26,559	24,830
Amortization of intangible assets	11,824	33,466
Deferred tax provision	481,401	0
Provision for inventory excess and obsolescence	14,977	19,623
Provision for warranty	10,565	2,347
Other	12,645	10,416
Changes in assets and liabilities:
Accounts receivable	(28,055)	9,381
Inventories	20,420	(95,554)
Prepaid expenses and other	2,623	(15,054)
Accounts payable, accruals and other obligations	(55,986)	(24,974)
Deferred revenue	(5,736)	3,832
Net cash provided by operating activities	73,130	45,748
Cash flows used in investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(31,946)	(60,328)
Restricted cash	54	0
Purchase of available for sale securities	(198,026)	(179,833)
Proceeds from maturities of available for sale securities	200,000	180,000
Settlement of foreign currency forward contracts, net	132	(2,965)
Purchase of cost method investment	(767)	0
Net cash used in investing activities	(30,553)	(63,126)
Cash flows used in financing activities:
Payment of long-term debt	(2,000)	(47,296)
Payment for modification of term loans	0	(93,625)
Payment of capital lease obligations	(1,868)	(1,528)
Repurchases of common stock-repurchase program	(38,036)	0
Proceeds from issuance of common stock	11,804	10,345
Net cash used in financing activities	(30,100)	(132,104)
Effect of exchange rate changes on cash and cash equivalents	(894)	490
Net increase (decrease) in cash and cash equivalents	11,583	(148,992)
Cash and cash equivalents at beginning of period	640,513	777,615
Cash and cash equivalents at end of period	652,096	628,623
Supplemental disclosure of cash flow information
Cash paid during the period for interest	21,843	23,439
Cash paid during the period for income taxes, net	15,136	11,379
Non-cash investing activities
Purchase of equipment in accounts payable	3,226	3,818
Building subject to capital lease	0	20,695
Non-cash financing activities
Repurchase of common stock in accrued liabilities from repurchase program	$ 1,111	$ 0