Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Cash flow from operating activities:
Net income	$ 466,892	$ 371,653
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	159,156	152,133
Reduction of operating lease right-of-use assets	62,585	0
Amortization of capitalized costs to obtain revenue contracts	44,851	46,230
Stock-based compensation	170,155	114,826
Allowance for doubtful accounts	14,875	8,950
(Gain) loss on sale of property and investments	(1,994)	(4,052)
Deferred income taxes	(74,374)	(9,664)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(89,667)	89,370
Inventories	(17,040)	(39,431)
Prepaid and other current assets	(21,350)	(38,224)
Other long-term assets	(77,895)	(114,344)
Accounts payable and accrued liabilities	43,842	(45,200)
Operating lease liabilities	(57,968)	0
Income taxes	6,128	(6,963)
Deferred revenue	160,966	53,980
Net cash provided by operating activities	789,162	579,264
Cash flows from investing activities:
Proceeds from sales of long-term investments	2,151	6,361
Purchases of long-term investments	(2,762)	0
Purchases of property and equipment	(120,234)	(122,358)
Cash paid for acquisitions and intangible assets, net of cash acquired	(201,045)	0
Capitalization of software development costs	(3,035)	(2,245)
Net cash used in investing activities	(324,925)	(118,242)
Cash flows from financing activities:
Proceeds from credit facilities	276,490	192,897
Repayment of debt	(284,218)	(520,312)
Issuances of common stock	123,237	107,354
Payments for taxes related to net share settlement of equity awards	(66,985)	(52,309)
Purchase of equity forward contract	0	(20,000)
Purchases of treasury stock	(200,000)	(209,185)
Other	0	(762)
Net cash used in financing activities	(151,476)	(502,317)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	8,700	4,975
Net change in cash, cash equivalents and restricted cash	321,461	(36,320)
Cash, cash equivalents and restricted cash, beginning of year	730,527	725,001
Cash, cash equivalents and restricted cash, end of period	$ 1,051,988	$ 688,681