Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Cash flow from operating activities:
Net income	$ 86,588	$ 60,035
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Amortization and depreciation	49,464	56,436
Stock compensation	25,834	23,013
Allowance for doubtful accounts	229	250
(Gain) loss on sale of investments	(1)	3
Write-down of long-term investments	1,300	0
Deferred income taxes	12,989	(3,955)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	122,192	30,365
Prepaid and other current assets	(24,893)	(27,825)
Other long-term assets	(13,931)	9,008
Accounts payable and accrued liabilities	(129,316)	(145,229)
Income taxes	(14,201)	(5,174)
Deferred revenue	(69,372)	(32,097)
Net cash provided by (used in) operating activities	46,882	(35,170)
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	37,284	40,489
Purchases of short-term investments	(35,338)	(34,933)
Proceeds from sales of long-term investments	0	161
Purchases of property and equipment	(18,178)	(15,337)
Cash paid for acquisitions and intangible assets, net of cash acquired	(187,624)	(18,941)
Capitalization of software development costs	(1,033)	(920)
Payments for (Proceeds from) Other Investing Activities	(2,100)	0
Net cash used in investing activities	(202,789)	(29,481)
Cash flows from financing activities:
Proceeds from credit facility and term loan	150,000	30,000
Repayment of debt	(35,000)	(7,500)
Issuances of common stock	7,205	1,486
Payments Related to Tax Withholding for Share-based Compensation	(6,887)	(5,211)
Purchase of equity forward contract	(20,000)	(40,000)
Purchases of treasury stock	(80,000)	(160,000)
Other	559	(1,030)
Net cash provided by (used in) financing activities	15,877	(182,255)
Effect of exchange rate changes on cash and cash equivalents	(8,881)	(6,296)
Net change in cash and cash equivalents	(148,911)	(253,202)
Cash and cash equivalents, beginning of year	976,620	836,188
Cash and cash equivalents, end of period	$ 827,709	$ 582,986