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Revenue Recognition - Additional Information (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 28, 2025 MW | May 08, 2025 item | May 28, 2024 USD ($) item MW | May 31, 2023 USD ($) | Apr. 30, 2025 USD ($) item MW | Apr. 30, 2024 USD ($) | Apr. 30, 2025 USD ($) item MW | Apr. 30, 2024 USD ($) | Oct. 31, 2024 USD ($) | Oct. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) | Jan. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 USD ($)
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract asset |  |  |  |  | $ 78,700,000 |  | $ 78,700,000 |  | $ 65,100,000 |  |  |  |  |
Contract asset, long-term |  |  |  |  | 33,300,000 |  | 33,300,000 |  | 28,300,000 |  |  |  |  |
Contract liability |  |  |  |  | 7,100,000 |  | 7,100,000 |  | 7,200,000 |  |  |  |  |
Revenues |  |  |  |  | 37,406,000 | $ 22,420,000 | 56,403,000 | $ 39,111,000 |  |  |  |  |  |
Amount of long-term service agreement |  |  | $ 159,600,000 |  |  |  |  |  |  |  |  |  |  |
Toyota Investment Tax Credit Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration payable |  |  |  |  |  |  |  |  | 6,000,000 | $ 6,300,000 |  | $ 6,000,000 |  |
Consideration payable, long term |  |  |  |  |  |  |  |  | 4,500,000 | 6,000,000 |  | $ 4,500,000 |  |
Sale of investment tax credit |  |  |  |  |  |  |  |  |  | $ 6,300,000 |  |  |  |
Hydrogen production and power purchase agreement |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |
EMTEC Joint Development Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract liability |  |  |  |  | $ 15,600,000 |  | 15,600,000 |  |  |  |  |  |  | $ 11,600,000
Change order to the original purchase order |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |
Revenues |  |  |  | $ 2,500,000 |  |  | $ 500,000 |  | $ 2,000,000 | $ 2,000,000 |  |  |  |
Discount on purchase of fuel cell module |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |
Milestone payment received |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Remaining balance |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |
Milestone based payments |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Amendment No 5 to EMTEC Joint Development Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum expected annual budget for the anticipated work through the remaining term of agreement |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
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 | item |  |  | 6 |  | 4 |  | 4 |  |  |  |  |  |  |
Capacity of fuel cell | MW |  |  | 1.4 |  | 1.4 |  | 1.4 |  |  |  |  |  |  |
Long term service agreement term |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Power modules to be purchase | item |  |  | 42 |  |  |  |  |  |  |  |  |  |  |
GGE | Fiscal Year 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fuel cells | item |  | 16 |  |  |  |  |  |  |  |  |  |  |  |
Capacity of fuel cell | MW | 1.4 |  |  |  |  |  |  |  |  |  |  |  |  |
GGE | Fiscal Year 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fuel cells | item |  | 16 |  |  |  |  |  |  |  |  |  |  |  |
Capacity of fuel cell | MW |  |  | 1.4 |  |  |  |  |  |  |  |  |  |  |
Maximum | Amendment No 5 to EMTEC Joint Development Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
CO2 capture annual basis |  |  |  |  | 250,000 |  | 250,000 |  |  |  |  |  |  |
Service |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 8,144,000 | 1,369,000 | $ 9,992,000 | 2,986,000 |  |  |  |  |  |
Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 12,124,000 | 14,118,000 | 23,470,000 | 24,611,000 |  |  |  |  |  |
Remaining performance obligations |  |  |  |  | $ 383,000,000 |  | $ 383,000,000 |  |  |  |  |  |  |
Generation | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  |  |  | 20 years |  | 20 years |  |  |  |  |  |  |
Generation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  |  |  | 19 years |  | 19 years |  |  |  |  |  |  |
Advanced Technologies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 4,111,000 | $ 6,933,000 | $ 9,842,000 | $ 11,514,000 |  |  |  |  |  |
Remaining performance obligations |  |  |  |  | $ 7,900,000 |  | $ 7,900,000 |  |  |  |  |  |  |
Advanced Technologies | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  |  |  | 2 years |  | 2 years |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 13,027,000 |  | $ 13,099,000 |  |  |  |  |  |  |
Remaining performance obligations |  |  |  |  | 98,200,000 |  | 98,200,000 |  |  |  |  |  |  |
Service Agreements | Service |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligations |  |  |  |  | $ 164,400,000 |  | $ 164,400,000 |  |  |  |  |  |  |
Service Agreements | Service | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  |  |  | 15 years |  | 15 years |  |  |  |  |  |  |
Service Agreements | Service | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  |  |  | 3 years |  | 3 years |  |  |  |  |  |  |

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