Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 33,616	$ (473,363)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	21,513	20,833
Share-based compensation costs	13,755	12,393
Amortization of intangible assets	8,947	5,912
Deferred taxes	5,037	476,897
Provision for inventory excess and obsolescence	4,673	6,804
Provision for warranty	3,891	4,657
Other	3,356	2,269
Changes in assets and liabilities:
Accounts receivable	38,544	72,439
Inventories	(67,555)	5,199
Prepaid expenses and other	1,133	16,120
Accounts payable, accruals and other obligations	(76,351)	(111,476)
Deferred revenue	(4,664)	(2,981)
Net cash provided by (used in) operating activities	(14,105)	35,703
Cash flows provided by (used in) investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(15,345)	(25,662)
Purchase of available for sale securities	(68,516)	(118,877)
Proceeds from maturities of available for sale securities	60,000	110,000
Proceeds from sales of available for sale securities	98,265	0
Settlement of foreign currency forward contracts, net	(4,650)	1,061
Purchase of cost method investment	(333)	0
Net cash provided by (used in) investing activities	69,421	(33,478)
Cash flows provided by (used in) financing activities:
Payment of long-term debt	(1,750)	(1,000)
Payment of capital lease obligations	(758)	(914)
Payment for debt conversion liability	(111,268)	0
Shares repurchased for tax withholdings on vesting of restricted stock units	(10,026)	0
Repurchases of common stock - repurchase program	(19,721)	(4,103)
Proceeds from issuance of common stock	10,899	11,008
Net cash provided by (used in) financing activities	(132,624)	4,991
Effect of exchange rate changes on cash and cash equivalents	695	1,138
Net increase (decrease) in cash and cash equivalents	(76,613)	8,354
Cash and cash equivalents at beginning of period	745,423	640,513
Cash and cash equivalents at end of period	668,810	648,867
Supplemental disclosure of cash flow information
Cash paid during the period for interest	10,007	10,020
Cash paid during the period for income taxes, net	3,402	3,498
Non-cash investing activities
Purchase of equipment in accounts payable	5,471	2,014
Non-cash financing activities
Repurchase of common stock in accrued liabilities from repurchase program	1,441	1,652
Conversion of debt conversion liability into 1,585,140 shares of common stock	$ 52,944	$ 0