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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Cash flow from operating activities:      
Net income $ 225,934 $ 259,124 $ 247,800
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization and depreciation 211,821 192,826 187,404
Stock compensation 86,400 79,440 67,511
Allowance for doubtful accounts 1,300 (1,250) 102
(Gain) loss on sale of investments (109) (6,999) (868)
Excess tax benefits from stock-based compensation (4,245) 0 0
Deferred income taxes 36,883 (17,100) (676)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:      
Accounts receivable (56,533) (65,018) 37,590
Prepaid and other current assets (23,106) 1,836 (12,063)
Other long-term assets (16,259) (23,270) (27,468)
Accounts payable and accrued liabilities 27,568 40,645 (1,135)
Income taxes (44,633) (9,095) (2,306)
Deferred revenue 50,139 99,814 814
Net cash provided by operating activities 495,160 550,953 496,705
Cash flows from investing activities:      
Proceeds from sales and maturities of short-term investments 109,173 0 0
Purchases of short-term investments (238,902) 0 0
Proceeds from sales of long-term investments 0 7,774 989
Proceeds from sale of property and equipment 0 0 2,000
Purchases of property and equipment (86,965) (103,275) (65,459)
Cash paid for acquisitions and intangible assets, net of cash acquired (340,153) (394,623) 0
Capitalization of software development costs (3,682) (3,638) (3,609)
Other 900 (3,488) 0
Net cash used in investing activities (559,629) (497,250) (66,079)
Cash flows from financing activities:      
Acquisition of non-controlling interests 0 0 (44,004)
Proceeds from credit facility 460,000 200,000 0
Repayment of debt (330,425) (230,968) (30,712)
Issuances of common stock 84,904 82,083 131,914
Purchase of equity forward contract (20,000) 0 0
Purchases of treasury stock (260,000) (119,747) (145,016)
Excess tax benefits from stock-based compensation 4,245 0 0
Other (794) (5,057) (10,167)
Net cash used in financing activities (62,070) (73,689) (97,985)
Effect of exchange rate changes on cash and cash equivalents (23,035) (16,693) (10,582)
Net change in cash and cash equivalents (149,574) (36,679) 322,059
Cash and cash equivalents, beginning of year 985,762 1,022,441 700,382
Cash and cash equivalents, end of year 836,188 985,762 1,022,441
Supplemental Disclosure of Cash Flow Information:      
Cash paid for income taxes during the year: 59,731 40,741 31,326
Interest payments during the year: $ 2,710 $ 1,904 $ 1,761