Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Parenthetical) (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Additional long-term unbilled receivables	[1]	$ 6,289	$ 7,063
Government [Member]
Accounts Notes And Loans Receivable [Line Items]
U.S. government accounts receivable, including unbilled receivables		1,000	1,100
Other Assets [Member]
Accounts Notes And Loans Receivable [Line Items]
Additional long-term unbilled receivables		$ 9,900	$ 8,900

[1] Additional long-term unbilled receivables of $9.9 million and $8.9 million are included within “Other Assets” as of April 30, 2021 and October 31, 2020, respectively.