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Revenue Recognition - Additional Information (Details) $ in Thousands								1 Months Ended	3 Months Ended	12 Months Ended
	May 28, 2024 USD ($)	May 28, 2024 USD ($)	May 28, 2024 USD ($) item	May 28, 2024 USD ($) MW	Dec. 20, 2021 USD ($) item	Oct. 29, 2021 USD ($)	Oct. 31, 2019 USD ($)	May 31, 2023 USD ($)	Apr. 30, 2022 USD ($)	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Oct. 31, 2022 USD ($) item	Jul. 31, 2024 item	Mar. 31, 2024 USD ($)	Jan. 31, 2024 USD ($)	Aug. 25, 2023 USD ($)	Aug. 24, 2023 USD ($)	Jul. 31, 2023 item	Dec. 19, 2022 USD ($)	Dec. 18, 2022 USD ($)	Apr. 29, 2022 USD ($)	Apr. 28, 2022 USD ($)
Revenue Recognition
Contract asset										$ 65,100	$ 42,100
Contract asset, long-term										28,300	25,800
Contract liability										7,200	3,100
Consideration payable											6,300
Consideration payable, long term											6,000
Sale of investment tax credit											6,300
Revenues										112,132	123,394	$ 130,484
Amount of long-term service agreement	$ 159,600	$ 159,600	$ 159,600	$ 159,600
Research and development expenses										55,404	61,021	34,529
Accounts receivable from contract assets										16,000	12,900
Kfc And Posco international Company
Revenue Recognition
Revenues											10,500
Variable consideration											13,100
POSCO Energy Settlement Agreement
Revenue Recognition
Revenues											9,100
Settlement agreement variable consideration from contract with customer											13,100	$ 13,100
Settlement agreement number of module units sold | item					20							20
Option to purchase additional warranty module units | item					14
Number of modules | item					2
Option to purchase warranty module units | item												20
Stand alone selling price per sale module					3,000
Number of additional modules expired without exercised | item												14
Modules units, order placed | item					20
Stand alone selling price per warranty module					$ 650
Extended warranty term					7 years
Toyota Investment Tax Credit Sale
Revenue Recognition
Consideration payable										6,000
Consideration payable, long term										$ 4,500
Hydrogen production and power purchase agreement										20 years
EMTEC Joint Development Agreement
Revenue Recognition
Contract liability															$ 11,600
Revenues								$ 2,500		$ 1,700	300
Research costs reimbursement amount																$ 67,000	$ 60,000		$ 60,000	$ 50,000	$ 50,000	$ 45,000
Milestone payment received												$ 5,000
Milestone based payments									$ 5,000
Research and development expenses							$ 45,000
Investment Amount						$ 5,000
Amendment No 5 to EMTEC Joint Development Agreement
Revenue Recognition
Minimum expected annual budget for the anticipated work through the remaining term of agreement														$ 10,000
Long Term Service Agreement | Posco Energy | Noeul
Revenue Recognition
Number of modules transfer | item																		16
Long Term Service Agreement | Kfc And Posco international Company | Noeul
Revenue Recognition
Number of modules transfer | item																		16
GGE
Revenue Recognition
Capacity of plant | MW				58.8
Number of plants | item			21
Number of cells per plant | item			2
Number of fuel cells		42,000	42
Capacity of fuel cell | MW				1.4
Long term service agreement term	7 years
Rotterdam Project | EMTEC Joint Development Agreement
Revenue Recognition
Investments												5,000
Remaining balance												2,500
Investment Amount												5,000
Maximum | Amendment No 5 to EMTEC Joint Development Agreement
Revenue Recognition
CO2 capture annual basis | item													250,000
Service
Revenue Recognition
Revenues										9,969	49,084	12,786
Amount of revenue recognized										1,900
Generation
Revenue Recognition
Revenues										49,975	37,508	36,186
Remaining performance obligations										$ 172,400
Generation | Maximum
Revenue Recognition
Revenue performance obligation expected timing of satisfaction										20 years
Generation | Minimum
Revenue Recognition
Revenue performance obligation expected timing of satisfaction										19 years
Advanced Technologies
Revenue Recognition
Revenues										$ 26,513	17,213	21,512
Remaining performance obligations										$ 9,600
Advanced Technologies | Maximum
Revenue Recognition
Revenue performance obligation expected timing of satisfaction										2 years
Product
Revenue Recognition
Revenues										$ 25,675	$ 19,589	$ 60,000
Amount of revenue recognized										18,000
Remaining performance obligations										111,300
Service Agreements | Service
Revenue Recognition
Remaining performance obligations										$ 389,000
Service Agreements | Service | Maximum
Revenue Recognition
Revenue performance obligation expected timing of satisfaction										15 years
Service Agreements | Service | Minimum
Revenue Recognition
Revenue performance obligation expected timing of satisfaction										3 years

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