Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Cash flow from operating activities:
Net income	$ 182,402	$ 221,364	$ 237,063
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	156,840	128,550	101,201
Stock compensation	71,414	56,414	59,988
Allowance for doubtful accounts	3,754	1,058	(899)
Write-down of long-term investments	452	999	468
(Gain) loss on sale of investments	(650)	(936)	(3,995)
Deferred income taxes	12,850	22,278	38,356
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(53,395)	(18,974)	(16,202)
Prepaid and other current assets	15,199	(13,445)	4,638
Other long-term assets	(10,231)	(4,248)	(5,923)
Accounts payable and accrued liabilities	42,960	(7,408)	10,566
Income taxes	(43,113)	(58,377)	(94,052)
Deferred revenue	107,586	113,041	9,827
Net cash provided by operating activities	486,068	440,316	341,036
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	166,132	136,983	547,686
Purchases of short-term investments	(18,179)	(127,385)	(243,515)
Proceeds from sales of long-term investments	506	2,828
Purchases of property and equipment	(54,191)	(57,345)	(39,223)
Cash paid for acquisitions and intangible assets, net of cash acquired	(970,089)	(41,015)	(500,829)
Capitalization of software development costs	(3,302)	(2,885)	(2,852)
Net cash used in investing activities	(879,123)	(88,819)	(238,733)
Cash flows from financing activities:
Principal payments on capital leases	(6,252)	(4,628)	(3,692)
Proceeds from credit facilities	250,000
Repayment of debts	(136,156)
Issuances of common stock	175,896	162,180	145,329
Purchase of equity forward contract		(33,335)
Purchases of treasury stock	(40,000)	(401,836)	(184,699)
Net cash provided by (used in) financing activities	243,488	(277,619)	(43,062)
Effect of exchange rate changes on cash and cash equivalents	(5,128)	5,792	14,553
Net change in cash and cash equivalents	(154,695)	79,670	73,794
Cash and cash equivalents, beginning of year	855,077	775,407	701,613
Cash and cash equivalents, end of year	700,382	855,077	775,407
Supplemental Disclosure of Cash Flow Information:
Cash paid for income taxes during the year:	49,208	36,577	18,673
Interest payments during the year:	$ 1,961	$ 69	$ 171