Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Cash flows provided by operating activities:
Net income (loss)	$ 173,103	$ (408,667)
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	65,071	63,104
Share-based compensation costs	44,446	38,896
Amortization of intangible assets	26,610	18,196
Deferred taxes	35,949	491,863
Provision for inventory excess and obsolescence	18,833	19,942
Provision for warranty	15,933	15,715
Other	743	18,164
Changes in assets and liabilities:
Accounts receivable	(2,517)	(112,696)
Inventories	(115,427)	17,751
Prepaid expenses and other	(85,039)	(11,163)
Accounts payable, accruals and other obligations	(9,005)	14,840
Deferred revenue	4,427	(4,710)
Net cash provided by operating activities	173,127	161,235
Cash flows provided by (used in) investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(49,063)	(50,386)
Purchase of available for sale securities	(127,601)	(217,715)
Proceeds from maturities of available for sale securities	120,000	290,000
Proceeds from sales of available for sale securities	98,263	0
Settlement of foreign currency forward contracts, net	(3,155)	4,759
Acquisition of business, net of cash acquired	0	(40,412)
Purchase of equity investment	(2,667)	(1,433)
Net cash provided by (used in) investing activities	35,777	(15,187)
Cash flows used in financing activities:
Payment of long-term debt	(5,250)	(3,000)
Payment of capital lease obligations	(2,599)	(2,811)
Payment for debt conversion liability	(111,268)	0
Shares repurchased for tax withholdings on vesting of stock unit awards	(23,234)	0
Repurchases of common stock - repurchase program	(110,484)	(73,512)
Proceeds from issuance of common stock	22,895	22,735
Net cash used in financing activities	(229,940)	(56,588)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	392	(3,759)
Net increase (decrease) in cash, cash equivalents and restricted cash	(20,644)	85,701
Cash, cash equivalents and restricted cash at beginning of period	745,434	640,513
Cash, cash equivalents and restricted cash at end of period	724,790	726,214
Supplemental disclosure of cash flow information
Cash paid during the period for interest	29,921	31,561
Cash paid during the period for income taxes, net	21,573	20,099
Non-cash investing activities
Purchase of equipment in accounts payable	4,328	5,677
Non-cash financing activities
Repurchase of common stock in accrued liabilities from repurchase program	1,441	1,275
Conversion of debt conversion liability into 1,585,140 shares of common stock	$ 52,944	$ 0