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Revenue Recognition - Additional Information (Details) $ in Thousands			3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 20, 2021 USD ($) item	Oct. 29, 2021 USD ($)	Apr. 30, 2022 USD ($) item	Apr. 30, 2021 USD ($)	Apr. 30, 2022 USD ($) item	Apr. 30, 2021 USD ($)	Oct. 31, 2019 USD ($)	Apr. 29, 2022 USD ($)	Apr. 28, 2022 USD ($)	Oct. 31, 2021 USD ($)
Disaggregation Of Revenue [Line Items]
Contract asset			$ 20,700		$ 20,700					$ 20,500
Contract liability			44,200		44,200					$ 36,700
Research Costs			7,673	$ 2,964	12,657	$ 4,787
Research and development expenses			7,673	$ 2,964	12,657	$ 4,787
Emre joint development agreement [Member]
Disaggregation Of Revenue [Line Items]
Research Costs							$ 45,000
Research costs reimbursement amount								$ 50,000	$ 45,000
Milestone based payments					5,000
Research and development expenses							$ 45,000
Investment Amount		$ 5,000			5,000
Discount on purchase of fuel cell module					5,000
POSCO Energy Settlement Agreement
Disaggregation Of Revenue [Line Items]
Deferred revenue	$ 22,200
Number of modules | item	2
Stand alone selling price per sale module	$ 3,000
Extended warranty term	7 years
Stand alone selling price per warranty module	$ 670
Settlement agreement variable consideration from contract with customer			$ 3,900		$ 3,900
Option to purchase warranty module units | item			6		6
Option to purchase additional warranty module units | item	14
Modules units, order placed | item	20
Product
Disaggregation Of Revenue [Line Items]
Remaining performance obligations			$ 60,200		$ 60,200
Service Agreements [Member]
Disaggregation Of Revenue [Line Items]
Remaining performance obligations			121,300		121,300
Advanced Technologies Contracts [Member]
Disaggregation Of Revenue [Line Items]
Remaining performance obligations			35,400		35,400
Posco Energy
Disaggregation Of Revenue [Line Items]
Deferred revenue			$ 22,200		$ 22,200

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Amount of discount on purchase of fuel cell module.

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Option to purchase additional warranty module units under the settlement agreement.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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