Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Cash flow from operating activities:
Net income	$ 532,367	$ 432,518	$ 136,563
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	201,676	209,207	189,442
Amortization of capitalized costs to obtain revenue contracts	62,750	0	0
Stock-based compensation	155,001	140,032	108,294
Allowance for doubtful accounts	11,669	3,368	2,149
(Gain) loss on sale of property and investments	(4,052)	(93)	8
Write-down of long-term investments	0	0	1,300
Deferred income taxes	(82,620)	(210,310)	123,052
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(8,575)	(95,785)	2,296
Inventories	(19,243)	(66,509)	(20,137)
Prepaid and other current assets	(49,779)	(12,652)	(10,948)
Other long-term assets	(124,895)	(25,908)	(40,189)
Accounts payable and accrued liabilities	(19,280)	49,043	137,631
Income taxes	19,777	(103,841)	19,665
Deferred revenue	125,717	105,329	(16,644)
Net cash provided by operating activities	800,513	424,399	632,482
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	0	12,449	295,633
Purchases of short-term investments	0	0	(155,098)
Proceeds from sales of long-term investments	6,361	494	839
Purchases of long-term investments	(3,245)	(3,561)	0
Proceeds from sale of property and equipment	0	1,662	0
Purchases of property and equipment	(198,129)	(98,976)	(70,328)
Cash paid for acquisitions and intangible assets, net of cash acquired	(36,605)	(652,643)	(259,202)
Capitalization of software development costs	(4,259)	(2,950)	(3,226)
Other	0	0	2,100
Net cash used in investing activities	(235,877)	(743,525)	(189,282)
Cash flows from financing activities:
Proceeds from credit facilities	192,897	620,635	320,000
Repayment of debt	(524,063)	(295,313)	(380,625)
Issuances of common stock	156,364	123,829	126,337
Payments for taxes related to net share settlement of equity awards	(57,143)	(45,772)	(36,730)
Purchase of equity forward contract	0	0	(20,000)
Purchases of treasury stock	(329,185)	(400,000)	(380,000)
Other	(762)	1,759	(2,102)
Net cash (used in) provided by financing activities	(561,892)	5,138	(373,120)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,782	(11,086)	(427)
Net change in cash, cash equivalents and restricted cash	5,526	(325,074)	69,653
Cash, cash equivalents and restricted cash, beginning of year	725,001	1,050,075	980,422
Cash, cash equivalents and restricted cash, end of year	730,527	725,001	1,050,075
Supplemental disclosure of cash flow information:
Cash paid for income taxes during the year:	75,744	252,522	103,478
Interest payments during the year:	$ 12,363	$ 15,307	$ 7,095