Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Jan. 31, 2019	Jan. 31, 2018
Cash flow from operating activities:
Net income (loss)	$ 153,514	$ (3,691)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Amortization and depreciation	51,830	43,920
Amortization of capitalized costs to obtain revenue contracts	12,793	0
Stock compensation	38,460	32,323
Allowance for doubtful accounts	1,500	368
(Gain) loss on sale of property and investments	0	4
Deferred income taxes	(6,215)	46,172
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(209,049)	(34,811)
Inventories	(15,827)	(15,811)
Prepaid and other current assets	(10,027)	(14,504)
Other long-term assets	(49,403)	(25,601)
Accounts payable and accrued liabilities	(219,099)	(139,864)
Income taxes	(41,985)	(18,017)
Deferred revenue	149,489	70,458
Net cash used in operating activities	(144,019)	(59,054)
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	0	12,449
Purchases of property and equipment	(29,007)	(28,316)
Cash paid for acquisitions and intangible assets, net of cash acquired	0	(608,344)
Capitalization of software development costs	(737)	(807)
Net cash used in investing activities	(29,744)	(625,018)
Cash flows from financing activities:
Proceeds from credit facilities	185,080	450,000
Repayment of debt	(112,812)	(21,875)
Issuances of common stock	6,358	12,486
Payments for taxes related to net share settlement of equity awards	(10,593)	(10,247)
Purchase of equity forward contract	0	(20,000)
Purchases of treasury stock	(29,185)	(180,000)
Other	(762)	0
Net cash provided by financing activities	38,086	230,364
Effect of exchange rate changes on cash, cash equivalents and restricted cash	4,882	11,555
Net change in cash, cash equivalents and restricted cash	(130,795)	(442,153)
Cash, cash equivalents and restricted cash, beginning of period	725,001	1,050,075
Cash, cash equivalents and restricted cash, end of period	$ 594,206	$ 607,922

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Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration