CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows provided by operating activities:
Net income	$ 101,897	$ 35,997
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	55,873	46,624
Share-based compensation costs	36,843	41,832
Amortization of intangible assets	39,721	59,428
Provision for inventory excess and obsolescence	28,727	26,663
Provision for warranty	5,188	13,114
Other	21,076	15,706
Changes in assets and liabilities:
Accounts receivable	(80,652)	(37,768)
Inventories	(93,896)	(56,267)
Prepaid expenses and other	(26,450)	16,687
Accounts payable, accruals and other obligations	(5,960)	(5,087)
Deferred revenue	13,978	(4,120)
Net cash provided by operating activities	96,345	152,809
Cash flows used in investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(76,004)	(81,161)
Purchase of available for sale securities	(189,802)	(340,168)
Proceeds from maturities of available for sale securities	260,003	160,606
Settlement of foreign currency forward contracts, net	(1,619)	(9,982)
Acquisition of business, net of cash acquired	0	(32,000)
Net cash used in investing activities	(7,422)	(302,705)
Cash flows provided by (used in) financing activities:
Proceeds from issuance of term loan, net	0	248,750
Payment of long-term debt	(232,554)	(45,990)
Payment for modification of term loans	(93,625)	0
Payment of debt issuance costs	0	(3,980)
Payment of capital lease obligations	(2,650)	(5,359)
Proceeds from issuance of common stock	20,395	22,118
Net cash provided by (used in) financing activities	(308,434)	215,539
Effect of exchange rate changes on cash and cash equivalents	1,436	(1,696)
Net increase (decrease) in cash and cash equivalents	(218,075)	63,947
Cash and cash equivalents at beginning of period	777,615	790,971
Cash and cash equivalents at end of period	559,540	854,918
Supplemental disclosure of cash flow information
Cash paid during the period for interest	33,861	31,787
Cash paid during the period for income taxes, net	26,793	9,947
Non-cash investing activities
Purchase of equipment in accounts payable	6,012	10,204
Construction in progress subject to build-to-suit lease	0	35,875
Equipment
Non-cash investing activities
Equipment acquired under and building subject to capital lease	0	5,322
Building
Non-cash investing activities
Equipment acquired under and building subject to capital lease	$ 50,370	$ 8,993