Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows provided by operating activities:
Net income (loss)	$ 86,354	$ (459,507)
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	42,995	41,400
Share-based compensation costs	29,362	26,559
Amortization of intangible assets	17,778	11,824
Deferred taxes	18,293	481,401
Provision for inventory excess and obsolescence	10,245	14,977
Provision for warranty	9,276	10,565
Other	(2,259)	12,645
Changes in assets and liabilities:
Accounts receivable	43,174	(28,055)
Inventories	(109,554)	20,420
Prepaid expenses and other	(33,241)	2,623
Accounts payable, accruals and other obligations	(26,971)	(55,986)
Deferred revenue	4,560	(5,736)
Net cash provided by operating activities	90,012	73,130
Cash flows provided by (used in) investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(35,289)	(31,946)
Restricted cash	0	54
Purchase of available for sale securities	(97,897)	(198,026)
Proceeds from maturities of available for sale securities	90,000	200,000
Proceeds from sales of available for sale securities	98,263	0
Settlement of foreign currency forward contracts, net	(2,741)	132
Purchase of equity investment	(2,667)	(767)
Net cash provided by (used in) investing activities	49,669	(30,553)
Cash flows used in financing activities:
Payment of long-term debt	(3,500)	(2,000)
Payment of capital lease obligations	(1,679)	(1,868)
Payment for debt conversion liability	(111,268)	0
Shares repurchased for tax withholdings on vesting of stock unit awards	(15,865)	0
Repurchases of common stock - repurchase program	(65,103)	(38,036)
Proceeds from issuance of common stock	11,235	11,804
Net cash used in financing activities	(186,180)	(30,100)
Effect of exchange rate changes on cash and cash equivalents	224	(894)
Net increase (decrease) in cash and cash equivalents	(46,275)	11,583
Cash and cash equivalents at beginning of period	745,423	640,513
Cash and cash equivalents at end of period	699,148	652,096
Supplemental disclosure of cash flow information
Cash paid during the period for interest	19,978	21,843
Cash paid during the period for income taxes, net	9,258	15,136
Non-cash investing activities
Purchase of equipment in accounts payable	2,793	3,226
Non-cash financing activities
Repurchase of common stock in accrued liabilities from repurchase program	1,441	1,111
Conversion of debt conversion liability into 1,585,140 shares of common stock	$ 52,944	$ 0