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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 |  |  |

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