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Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Cash flow from operating activities:    
Net income (loss) $ 371,653 $ 178,190
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization and depreciation 152,133 150,245
Amortization of capitalized costs to obtain revenue contracts 46,230 0
Stock compensation 114,826 102,540
Allowance for doubtful accounts 8,950 3,368
(Gain) loss on sale of property and investments (4,052) (93)
Deferred income taxes (9,664) 5,509
Net changes in operating assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable 89,370 (41,695)
Inventories (39,431) (48,440)
Prepaid and other current assets (38,224) (9,766)
Other long-term assets (114,344) (31,652)
Accounts payable and accrued liabilities (45,200) (56,491)
Income taxes (6,963) (35,014)
Deferred revenue 53,980 76,780
Net cash provided by operating activities 579,264 293,481
Cash flows from investing activities:    
Proceeds from sales and maturities of short-term investments 0 12,449
Proceeds from Sale and Maturity of Other Investments 6,361 494
Proceeds from Sale of Property, Plant, and Equipment 0 1,662
Payments to Acquire Other Investments 0 645
Purchases of property and equipment (122,358) (70,469)
Cash paid for acquisitions and intangible assets, net of cash acquired 0 (646,687)
Capitalization of software development costs (2,245) (2,714)
Net cash used in investing activities (118,242) (705,910)
Cash flows from financing activities:    
Proceeds from credit facilities 192,897 615,000
Repayment of debt (520,312) (137,500)
Issuances of common stock 107,354 72,722
Payments for taxes related to net share settlement of equity awards (52,309) (42,636)
Purchase of equity forward contract (20,000) (33,000)
Purchases of treasury stock (209,185) (367,000)
Other (762) 1,759
Net cash (used in) provided by financing activities (502,317) 109,345
Effect of exchange rate changes on cash, cash equivalents and restricted cash 4,975 (3,826)
Net change in cash, cash equivalents and restricted cash (36,320) (306,910)
Cash, cash equivalents and restricted cash, beginning of period 725,001 1,050,075
Cash, cash equivalents and restricted cash, end of period $ 688,681 $ 743,165