Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Cash flow from operating activities:
Net income	$ 266,826	$ 225,934	$ 259,124
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	207,032	211,821	192,826
Stock compensation	97,583	86,400	79,440
Allowance for doubtful accounts	950	1,300	(1,250)
(Gain) loss on sale of investments	(18)	(109)	(6,999)
Deferred income taxes	(14,037)	36,883	(17,100)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(43,269)	(56,533)	(65,018)
Prepaid and other current assets	(37,641)	(23,106)	1,836
Other long-term assets	(3,770)	(16,259)	(23,270)
Accounts payable and accrued liabilities	18,977	27,568	40,645
Income taxes	7,098	(48,878)	(9,095)
Deferred revenue	86,904	50,139	99,814
Net cash provided by operating activities	586,635	495,160	550,953
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	156,350	109,173	0
Purchases of short-term investments	(168,712)	(238,902)	0
Proceeds from sales of long-term investments	1,785	0	7,774
Purchases of long-term investments	(1,002)	0	0
Purchases of property and equipment	(66,909)	(86,965)	(103,275)
Cash paid for acquisitions and intangible assets, net of cash acquired	(60,056)	(340,153)	(394,623)
Capitalization of software development costs	(4,131)	(3,682)	(3,638)
Other	0	900	(3,488)
Net cash used in investing activities	(142,675)	(559,629)	(497,250)
Cash flows from financing activities:
Proceeds from credit facility	185,000	460,000	200,000
Repayment of debt	(185,000)	(330,425)	(230,968)
Issuances of common stock	125,283	109,764	103,730
Payments for taxes related to net share settlement of equity awards	(26,562)	(24,860)	(21,647)
Purchase of equity forward contract	0	(20,000)	0
Purchases of treasury stock	(400,000)	(260,000)	(119,747)
Other	(5,658)	3,451	(5,057)
Net cash used in financing activities	(306,937)	(62,070)	(73,689)
Effect of exchange rate changes on cash and cash equivalents	3,409	(23,035)	(16,693)
Net change in cash and cash equivalents	140,432	(149,574)	(36,679)
Cash and cash equivalents, beginning of year	836,188	985,762	1,022,441
Cash and cash equivalents, end of year	976,620	836,188	985,762
Supplemental Disclosure of Cash Flow Information:
Income taxes paid	69,447	59,731	40,741
Interest Payments during the year:	$ 3,708	$ 2,710	$ 1,904