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Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Cash flow from operating activities:    
Net income $ 194,129 $ 176,172
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization and depreciation 157,814 154,535
Stock compensation 72,043 63,463
Allowance for doubtful accounts 650 1,100
(Gain) loss on sale of investments (15) (22)
Excess tax benefits from stock-based compensation (5,653) 0
Deferred income taxes 2,747 24,134
Net changes in operating assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable 77,532 16,976
Prepaid and other current assets (22,941) (35,836)
Other long-term assets (8,118) (16,141)
Accounts payable and accrued liabilities (41,749) (25,512)
Income taxes 2,339 (20,633)
Deferred revenue 10,195 4,507
Net cash provided by operating activities 438,973 342,743
Cash flows from investing activities:    
Proceeds from sales and maturities of short-term investments 111,078 48,155
Purchases of short-term investments (126,216) (185,402)
Proceeds from sales of long-term investments 1,785 0
Purchases of long-term investments (1,002) 0
Purchases of property and equipment (48,249) (67,708)
Cash paid for acquisitions and intangible assets, net of cash acquired (60,056) (126,883)
Capitalization of software development costs (2,959) (2,798)
Payments for (Proceeds from) Other Investing Activities 0 (900)
Net cash used in investing activities (125,619) (333,736)
Cash flows from financing activities:    
Proceeds from credit facility 185,000 410,000
Repayment of debt (112,500) (272,924)
Issuances of common stock 44,166 56,414
Purchase of equity forward contract (25,000) 0
Purchases of treasury stock (300,000) (180,000)
Excess tax benefits from stock-based compensation 5,653 0
Other (2,940) (116)
Net cash provided by (used in) financing activities (205,621) 13,374
Effect of exchange rate changes on cash and cash equivalents 2,396 (21,720)
Net change in cash and cash equivalents 110,129 661
Cash and cash equivalents, beginning of year 836,188 [1] 985,762
Cash and cash equivalents, end of period $ 946,317 $ 986,423
[1] Derived from audited financial statements.