Project Assets - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) ProjectAsset	Jul. 31, 2018 USD ($)	Oct. 31, 2018 USD ($) ProjectAsset
Project Assets [Abstract]
Long-term project assets	$ 156,393		$ 156,393		$ 99,600
Number of project assets | ProjectAsset			6		5
Sale leaseback transaction, net book value	62,300		$ 62,300		$ 28,600
Project asset depreciation	2,400	$ 1,100	4,400	$ 3,100
Long-term project assets construction in progress	$ 94,100		$ 94,100		$ 71,000