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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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