Accounts Payable - Additional Information (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Oct. 31, 2017
Schedule Of Accounts Payable [Line Items]
Accounts payable	$ 44,133	$ 42,616
POSCO Energy [Member]
Schedule Of Accounts Payable [Line Items]
Accounts Payable, Related Parties, Current	$ 32,700	$ 32,700