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Accounts Receivable - Additional Information (Details) - USD ($) $ in Thousands | Oct. 31, 2017 | Oct. 31, 2016
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for Doubtful Accounts Receivable, Current | $ 79 | $ 193
POSCO Energy [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts Receivable, Related Parties, Current | 6,200 | 5,000
Accounts Payable, Related Parties, Current | 32,700 | 0
NRG Energy, Inc. [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 100 | $ 100

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