Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Cash flow from operating activities:
Net income	$ 432,518	$ 136,563	$ 266,826
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	209,207	189,442	207,032
Stock-based compensation	140,032	108,294	97,583
Allowance for doubtful accounts	3,368	2,149	950
(Gain) loss on sale of property and investments	(93)	8	(18)
Write-down of long-term investments	0	1,300	0
Deferred income taxes	(210,310)	123,052	(14,037)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(95,785)	2,296	(43,269)
Inventories	(66,509)	(20,137)	(32,072)
Prepaid and other current assets	(12,835)	(8,818)	(5,569)
Other long-term assets	(25,892)	(40,236)	(3,770)
Accounts payable and accrued liabilities	49,043	137,631	18,977
Income taxes	(103,841)	19,665	7,098
Deferred revenue	105,329	(16,644)	86,904
Net cash provided by operating activities	424,232	634,565	586,635
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	12,449	295,633	156,350
Purchases of short-term investments	0	(155,098)	(168,712)
Proceeds from sales of long-term investments	494	839	1,785
Purchases of long-term investments	(3,561)	0	(1,002)
Proceeds from sale of property and equipment	1,662	0	0
Purchases of property and equipment	(98,976)	(70,328)	(66,909)
Cash paid for acquisitions and intangible assets, net of cash acquired	(652,643)	(259,202)	(60,056)
Capitalization of software development costs	(2,950)	(3,226)	(4,131)
Other	0	2,100	0
Net cash used in investing activities	(743,525)	(189,282)	(142,675)
Cash flows from financing activities:
Proceeds from credit facility	620,635	320,000	185,000
Repayment of debt	(295,313)	(380,625)	(185,000)
Issuances of common stock	123,829	126,337	125,283
Payments for taxes related to net share settlement of equity awards	(45,772)	(36,730)	(26,562)
Purchase of equity forward contract	0	(20,000)	0
Purchases of treasury stock	(400,000)	(380,000)	(400,000)
Other	1,759	(2,102)	(5,658)
Net cash provided by (used in) financing activities	5,138	(373,120)	(306,937)
Effect of exchange rate changes on cash and cash equivalents	(11,086)	(427)	3,409
Net change in cash and cash equivalents	(325,241)	71,736	140,432
Cash and cash equivalents, beginning of year	1,048,356	976,620	836,188
Cash and cash equivalents, end of year	723,115	1,048,356	976,620
Supplemental disclosure of cash flow information:
Cash paid for income taxes during the year:	252,522	103,478	69,447
Interest payments during the year:	$ 15,307	$ 7,095	$ 3,708