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Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Millions | Jul. 31, 2018 | Oct. 31, 2017
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Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for Doubtful Accounts Receivable, Current | $ 0.1 | $ 0.1
POSCO Energy [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts Receivable, Related Parties, Current | 12.4 | 6.2
NRG Energy, Inc. [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 2.0 | $ 0.1

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