Financial Assets and Liabilities - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Oct. 31, 2019		Apr. 30, 2019	Oct. 31, 2018
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 856,424	$ 728,597	[1]
Total cash, cash equivalents and restricted cash	858,418	730,527		$ 633,048	$ 725,001
Restricted cash included in Prepaid expenses and other current assets
Cash and Cash Equivalents [Line Items]
Restricted cash	1,269	1,174
Restricted cash included in Other long-term assets
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 725	$ 756

[1] Derived from audited financial statements.