Financial Assets and Liabilities - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Oct. 31, 2019		Jul. 31, 2019	Oct. 31, 2018
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1,049,922	$ 728,597	[1]
Total cash, cash equivalents and restricted cash	1,051,988	730,527		$ 688,681	$ 725,001
Restricted cash included in Prepaid expenses and other current assets
Cash and Cash Equivalents [Line Items]
Restricted cash	1,287	1,174
Restricted cash included in Other long-term assets
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 779	$ 756

[1] Derived from audited financial statements.