Inventories - Additional Information (Details) - USD ($)	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Inventory [Line Items]
Long-term inventory	$ 6,797,000		$ 2,179,000
Costs of Revenues [Member]
Inventory [Line Items]
Excess plant capacity and manufacturing variances cost incurred	1,700,000	$ 3,200,000
Bridgeport Fuel Cell, LLC [Member]
Inventory [Line Items]
Long-term inventory	$ 6,800,000		$ 2,200,000