Project Assets - Additional Information (Details) $ in Millions	3 Months Ended		12 Months Ended
	Jan. 31, 2021 USD ($) ProjectAsset	Jan. 31, 2020 USD ($)	Oct. 31, 2020 USD ($) ProjectAsset
Project Assets [Abstract]
Number of project assets | ProjectAsset	8		8
Sale leaseback transaction, net book value	$ 70.6		$ 70.5
Project asset depreciation	4.0	$ 3.0
Long-term project assets construction in progress	94.0		91.3
PPA assets construction in progress	$ 4.9		$ 4.8