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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