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Summary of Significant Accounting Policies - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Oct. 31, 2018
Accounting Policies [Abstract]
Contract assets	$ 205,822	$ 126,897
Unbilled receivables	38,965	36,699
Deferred revenue	$ 1,230,222	$ 1,104,110

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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