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Accounts Payable - Additional Information (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Oct. 31, 2017
Schedule Of Accounts Payable [Line Items]    
Accounts payable $ 42,813 $ 42,616
POSCO Energy [Member]    
Schedule Of Accounts Payable [Line Items]    
Accounts Payable, Related Parties, Current $ 32,700 $ 32,700