Project Assets - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2020 USD ($) ProjectAsset	Apr. 30, 2019 USD ($)	Oct. 31, 2019 USD ($) ProjectAsset
Project Assets [Abstract]
Long-term project assets	$ 153,874		$ 153,874		$ 144,115
Number of project assets | ProjectAsset			8		7
Sale leaseback transaction, net book value	77,900		$ 77,900		$ 59,200
Project asset depreciation	2,800	$ 1,000	5,800	$ 2,100
Long-term project assets construction in progress	$ 76,000		$ 76,000		$ 84,900