Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash flows provided by operating activities:
Net income (loss)	$ (408,667)	$ 101,897
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	63,104	55,873
Share-based compensation costs	38,896	36,843
Amortization of intangible assets	18,196	39,721
Deferred tax provision	491,863	0
Provision for inventory excess and obsolescence	19,942	28,727
Provision for warranty	15,715	5,188
Other	18,164	21,076
Changes in assets and liabilities:
Accounts receivable	(112,696)	(80,652)
Inventories	17,751	(93,896)
Prepaid expenses and other	(11,163)	(26,450)
Accounts payable, accruals and other obligations	14,840	(5,960)
Deferred revenue	(4,710)	13,978
Net cash provided by operating activities	161,235	96,345
Cash flows used in investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(50,386)	(76,004)
Purchase of available for sale securities	(217,715)	(189,802)
Proceeds from maturities of available for sale securities	290,000	260,003
Settlement of foreign currency forward contracts, net	4,759	(1,619)
Acquisition of business, net of cash acquired	(40,412)	0
Purchase of cost method investment	(1,433)	0
Net cash used in investing activities	(15,187)	(7,422)
Cash flows used in financing activities:
Payment of long-term debt	(3,000)	(232,554)
Payment for modification of term loans	0	(93,625)
Payment of capital lease obligations	(2,811)	(2,650)
Repurchases of common stock-repurchase program	(73,512)	0
Proceeds from issuance of common stock	22,735	20,395
Net cash used in financing activities	(56,588)	(308,434)
Effect of exchange rate changes on cash and cash equivalents	(3,759)	1,436
Net increase (decrease) in cash and cash equivalents	85,701	(218,075)
Cash and cash equivalents at beginning of period	640,513	777,615
Cash and cash equivalents at end of period	726,214	559,540
Supplemental disclosure of cash flow information
Cash paid during the period for interest	31,561	33,861
Cash paid during the period for income taxes, net	20,099	26,793
Non-cash investing activities
Purchase of equipment in accounts payable	5,677	6,012
Building subject to capital lease	0	50,370
Non-cash financing activities
Repurchase of common stock in accrued liabilities from repurchase program	$ 1,275	$ 0