Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash flow from operating activities:
Net income	$ 139,894	$ 129,411
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	97,044	107,226
Stock compensation	51,396	46,472
Allowance for doubtful accounts	679	450
(Gain) loss on sale of investments	(1)	(10)
Write-down of long-term investments	1,300	0
Deferred income taxes	3,339	(9,984)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	81,098	93,619
Prepaid and other current assets	(13,291)	(23,208)
Other long-term assets	(24,021)	656
Accounts payable and accrued liabilities	(23,341)	(108,005)
Income taxes	(11,436)	3,489
Deferred revenue	(132,803)	(52,852)
Net cash provided by operating activities	169,857	187,264
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	94,512	75,570
Purchases of short-term investments	(94,182)	(79,079)
Proceeds from sales of long-term investments	0	1,785
Purchases of property and equipment	(31,195)	(28,900)
Cash paid for acquisitions and intangible assets, net of cash acquired	(187,624)	(46,100)
Capitalization of software development costs	(2,066)	(1,973)
Other	(2,100)	0
Net cash used in investing activities	(218,455)	(78,697)
Cash flows from financing activities:
Proceeds from credit facilities	250,000	60,000
Repayment of debt	(36,875)	(15,000)
Issuances of common stock	62,254	42,764
Payments for taxes related to net share settlement of equity awards	(8,058)	(5,981)
Purchase of equity forward contract	(20,000)	(20,000)
Purchases of treasury stock	(180,000)	(180,000)
Other	(482)	(550)
Net cash provided by (used in) financing activities	66,839	(118,767)
Effect of exchange rate changes on cash and cash equivalents	(3,536)	1,958
Net change in cash and cash equivalents	14,705	(8,242)
Cash and cash equivalents, beginning of year	976,620	836,188
Cash and cash equivalents, end of period	$ 991,325	$ 827,946