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Revenue Recognition - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 28, 2024 USD ($) item MW | May 31, 2023 USD ($) | Jul. 31, 2025 USD ($) item | Jul. 31, 2024 USD ($) | Jul. 31, 2025 USD ($) item MW | Jul. 31, 2024 USD ($) | Oct. 31, 2024 USD ($) | Oct. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 USD ($)
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Contract asset |  |  | $ 98,100 |  | $ 98,100 |  | $ 65,100 |  |  |  |
Contract asset, long-term |  |  | 53,400 |  | 53,400 |  | 28,300 |  |  |  |
Contract liability |  |  | 10,700 |  | 10,700 |  | 7,200 |  |  |  |
Revenues |  |  | 46,743 | $ 23,695 | 103,146 | $ 62,806 |  |  |  |  |
Amount of long-term service agreement | $ 159,600 |  |  |  |  |  |  |  |  |  |
Toyota Investment Tax Credit Sale |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Consideration payable |  |  | 6,000 |  | 6,000 |  | 6,000 | $ 6,300 |  |  |
Consideration payable, long term |  |  | 4,500 |  | 4,500 |  | 4,500 | 6,000 |  |  |
Sale of investment tax credit |  |  |  |  |  |  |  | $ 6,300 |  |  |
Hydrogen production and power purchase agreement |  |  |  |  |  |  |  | 20 years |  |  |
EMTEC Joint Development Agreement |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Contract liability |  |  | $ 15,600 |  | 15,600 |  |  |  |  |  | $ 11,600
Change order to the original purchase order |  |  |  |  | 4,000 |  |  |  |  |  |
Revenues |  | $ 2,500 |  |  | $ 500 |  | $ 2,000 | $ 2,000 |  |  |
Discount on purchase of fuel cell module |  |  |  |  |  |  |  | $ 2,500 |  |  |
Milestone payment received |  |  |  |  |  |  |  |  | $ 5,000 |  |
Remaining balance |  | $ 2,500 |  |  |  |  |  |  |  |  |
Milestone based payments |  |  |  |  |  |  |  |  | $ 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 |
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 |  |  |  | 12 |  |  |  |  |  |
Capacity of fuel cell | MW | 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 |  |  |  |  | 8 |  |  |  |  |  |
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 | item |  |  | 250,000 |  | 250,000 |  |  |  |  |  |
Service |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 3,130 | 1,411 | $ 13,122 | 4,397 |  |  |  |  |
Generation |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | 12,355 | 13,402 | 35,825 | 38,013 |  |  |  |  |
Remaining performance obligations |  |  | $ 378,900 |  | $ 378,900 |  |  |  |  |  |
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 |  |  | $ 5,258 | 8,632 | $ 15,100 | 20,146 |  |  |  |  |
Remaining performance obligations |  |  | $ 7,100 |  | $ 7,100 |  |  |  |  |  |
Advanced Technologies | Maximum |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 2 years |  | 2 years |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 26,000 | $ 250 | $ 39,099 | $ 250 |  |  |  |  |
Remaining performance obligations |  |  | $ 96,200 |  | $ 96,200 |  |  |  |  |  |
Product | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-11-01 |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 2 years |  | 2 years |  |  |  |  |  |
Service Agreements | Service |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligations |  |  | $ 169,400 |  | $ 169,400 |  |  |  |  |  |
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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