Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	May 31, 2023	Jan. 31, 2024	Jan. 31, 2023	Oct. 31, 2023	Oct. 31, 2022
Disaggregation Of Revenue [Line Items]
Contract asset		$ 45,100		$ 42,100
Contract asset, Long-term		22,700		25,800
Contract liability		4,300		3,100
Revenues		16,691	$ 37,073
Toyota Investment Tax Credit Sale
Disaggregation Of Revenue [Line Items]
Consideration payable				6,300
Consideration payable, Long term				6,000
Sale of investment tax credit				$ 6,300
Hydrogen production and power purchase agreement				20 years
EMTEC Joint Development Agreement
Disaggregation Of Revenue [Line Items]
Contract liability		11,600
Revenues	$ 2,500	500
Milestone payment received					$ 5,000
Remaining balance	$ 2,500
Milestone based payments					$ 5,000
Discount on purchase of fuel cell module				$ 2,500
Product
Disaggregation Of Revenue [Line Items]
Revenues			9,095
Remaining performance obligations		0
Service
Disaggregation Of Revenue [Line Items]
Revenues		1,617	13,882
Generation
Disaggregation Of Revenue [Line Items]
Revenues		10,493	9,557
Remaining performance obligations		$ 346,000
Generation | Maximum
Disaggregation Of Revenue [Line Items]
Revenue performance obligation expected timing of satisfaction		20 years
Generation | Minimum
Disaggregation Of Revenue [Line Items]
Revenue performance obligation expected timing of satisfaction		19 years
Advanced Technologies
Disaggregation Of Revenue [Line Items]
Revenues		$ 4,581	$ 4,539
Remaining performance obligations		$ 18,300
Advanced Technologies | Maximum
Disaggregation Of Revenue [Line Items]
Revenue performance obligation expected timing of satisfaction		2 years
Service Agreements | Service
Disaggregation Of Revenue [Line Items]
Remaining performance obligations		$ 140,400
Service Agreements | Service | Maximum
Disaggregation Of Revenue [Line Items]
Revenue performance obligation expected timing of satisfaction		15 years
Service Agreements | Service | Minimum
Disaggregation Of Revenue [Line Items]
Revenue performance obligation expected timing of satisfaction		3 years