Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Cash flow from operating activities:
Net income (loss)	$ 213,981	$ 271,724
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	105,078	102,841
Reduction of operating lease right-of-use assets	39,513	0
Amortization of capitalized costs to obtain revenue contracts	28,279	28,425
Stock-based compensation	108,318	75,374
Allowance for doubtful accounts	9,982	3,950
(Gain) loss on sale of property and investments	0	3,744
Deferred income taxes	(37,681)	(23,486)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(84,533)	23,478
Inventories	(24,096)	(50,358)
Prepaid and other current assets	(5,889)	(18,547)
Other long-term assets	(39,422)	(91,271)
Accounts payable and accrued liabilities	(78,989)	(160,492)
Operating lease liabilities	(32,432)	0
Income taxes	1,270	(32,059)
Deferred revenue	186,360	82,966
Net cash provided by operating activities	389,739	208,801
Cash flows from investing activities:
Proceeds from sales of long-term investments	0	4,176
Purchases of long-term investments	2,762	0
Purchases of property and equipment	(80,663)	(68,962)
Cash paid for acquisitions and intangible assets, net of cash acquired	(151,178)	0
Capitalization of software development costs	(2,130)	(1,491)
Net cash used in investing activities	(236,733)	(66,277)
Cash flows from financing activities:
Proceeds from credit facilities	276,490	188,760
Repayment of debt	(178,437)	(366,562)
Issuances of common stock	98,361	83,352
Payments for taxes related to net share settlement of equity awards	(17,105)	(13,173)
Purchase of equity forward contract	(20,000)	(20,000)
Purchases of treasury stock	(180,000)	(109,185)
Other	0	(762)
Net cash used in financing activities	(20,691)	(237,570)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(4,424)	3,093
Net change in cash, cash equivalents and restricted cash	127,891	(91,953)
Cash, cash equivalents and restricted cash, beginning of year	730,527	725,001
Cash, cash equivalents and restricted cash, end of period	$ 858,418	$ 633,048