Project Assets - Additional Information (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Apr. 30, 2019 USD ($) ProjectAsset	Oct. 31, 2018 USD ($) ProjectAsset
Project Assets [Abstract]
Long-term project assets	$ 123,136	$ 99,600
Number of project assets | ProjectAsset	5	5
Sale leaseback transaction, net book value	$ 26,100	$ 28,600
Long-term project assets construction in progress	$ 97,000	$ 71,000