Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Cash flows provided by (used in) operating activities:
Net income (loss)	$ (473,363)	$ 3,861
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	20,833	16,699
Share-based compensation costs	12,393	12,825
Amortization of intangible assets	5,912	18,864
Deferred tax provision	476,897	0
Provision for inventory excess and obsolescence	6,804	5,431
Provision for warranty	4,657	553
Other	2,269	4,452
Changes in assets and liabilities:
Accounts receivable	72,439	(21,956)
Inventories	5,199	(78,749)
Prepaid expenses and other	16,120	(1,004)
Accounts payable, accruals and other obligations	(111,476)	4,037
Deferred revenue	(2,981)	8,737
Net cash provided by (used in) operating activities	35,703	(26,250)
Cash flows used in investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(25,662)	(25,706)
Purchase of available for sale securities	(118,877)	(89,897)
Proceeds from maturities of available for sale securities	110,000	95,000
Settlement of foreign currency forward contracts, net	1,061	440
Net cash used in investing activities	(33,478)	(20,163)
Cash flows provided by (used in) financing activities:
Payment of long-term debt	(1,000)	(46,296)
Payment of capital lease obligations	(914)	(605)
Repurchases of common stock-repurchase program	(4,103)	0
Proceeds from issuance of common stock	11,008	9,708
Net cash provided by (used in) financing activities	4,991	(37,193)
Effect of exchange rate changes on cash and cash equivalents	1,138	(156)
Net increase (decrease) in cash and cash equivalents	8,354	(83,762)
Cash and cash equivalents at beginning of period	640,513	777,615
Cash and cash equivalents at end of period	648,867	693,853
Supplemental disclosure of cash flow information
Cash paid during the period for interest	10,020	11,831
Cash paid during the period for income taxes, net	3,498	5,521
Non-cash investing activities
Purchase of equipment in accounts payable	2,014	5,293
Non-cash financing activities
Repurchase of common stock in accrued liabilities from repurchase program	$ 1,652	$ 0