Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash flow from operating activities:
Net income	$ 178,190	$ 256,645
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	150,245	144,112
Stock compensation	102,540	79,697
Allowance for doubtful accounts	3,368	1,289
(Gain) loss on sale of investments	4	(1)
(Gain) loss on sale of property and equipment	(97)	0
Write-down of long-term investments	0	1,300
Deferred income taxes	5,509	(10,960)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(41,695)	42,413
Prepaid and other current assets	(58,409)	(13,636)
Other long-term assets	(31,659)	(33,416)
Accounts payable and accrued liabilities	(56,491)	36,129
Income taxes	(35,014)	(19,169)
Deferred revenue	76,780	(34,692)
Net cash provided by operating activities	293,271	449,711
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	12,449	130,529
Purchases of short-term investments	0	(137,486)
Proceeds from sales of long-term investments	494	839
Purchases of long-term investments	(645)	0
Proceeds from sales of property and equipment	1,662	0
Purchases of property and equipment	(70,469)	(50,227)
Cash paid for acquisitions and intangible assets, net of cash acquired	(646,687)	(187,624)
Capitalization of software development costs	(2,714)	(3,130)
Other	0	2,100
Net cash used in investing activities	(705,910)	(244,999)
Cash flows from financing activities:
Proceeds from credit facilities and term loan	615,000	270,000
Repayment of debt	(137,500)	(38,750)
Issuances of common stock	72,722	78,718
Payments for taxes related to net share settlement of equity awards	(42,636)	(35,376)
Purchase of equity forward contract	(33,000)	0
Purchases of treasury stock	(367,000)	(300,000)
Other	1,759	(482)
Net cash provided by (used in) financing activities	109,345	(25,890)
Effect of exchange rate changes on cash and cash equivalents	(3,826)	(456)
Net change in cash and cash equivalents	(307,120)	178,366
Cash and cash equivalents, beginning of year	1,048,356	976,620
Cash and cash equivalents, end of period	$ 741,236	$ 1,154,986