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Revenue Recognition - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2023 USD ($) | Apr. 30, 2024 USD ($) T | Apr. 30, 2023 USD ($) | Apr. 30, 2024 USD ($) T | Apr. 30, 2023 USD ($) | Oct. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 USD ($)
Revenue Recognition |  |  |  |  |  |  |  |  |
Contract asset |  | $ 47,800 |  | $ 47,800 |  | $ 42,100 |  |  |
Contract asset, Long-term |  | 21,400 |  | 21,400 |  | 25,800 |  |  |
Contract liability |  | 7,700 |  | 7,700 |  | 3,100 |  |  |
Revenues |  | $ 22,420 | $ 38,349 | 39,111 | $ 75,422 |  |  |  |
Toyota Investment Tax Credit Sale |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Contract liability |  |  |  |  |  |  |  |  | $ 11,600
Revenues | $ 2,500 |  |  | $ 900 |  |  |  |  |
Milestone payment received |  |  |  |  |  |  | $ 5,000 |  |
Remaining balance | $ 2,500 |  |  |  |  |  |  |  |
Discount on purchase of fuel cell module |  |  |  |  |  | $ 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 |
Amendment No 5 to EMTEC Joint Development Agreement | Maximum |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
CO2 capture annual basis | T |  | 250,000 |  | 250,000 |  |  |  |  |
Product |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 9,095 |  |  |  |
Remaining performance obligations |  | $ 12,300 |  | $ 12,300 |  |  |  |  |
Service |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Revenues |  | 1,369 | 26,190 | 2,986 | 40,072 |  |  |  |
Generation |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Revenues |  | 14,118 | 8,440 | 24,611 | 17,997 |  |  |  |
Remaining performance obligations |  | $ 335,300 |  | $ 335,300 |  |  |  |  |
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 |  | $ 6,933 | $ 3,719 | $ 11,514 | $ 8,258 |  |  |  |
Remaining performance obligations |  | $ 14,200 |  | $ 14,200 |  |  |  |  |
Advanced Technologies | Maximum |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  | 2 years |  | 2 years |  |  |  |  |
Service Agreements | Service |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Remaining performance obligations |  | $ 145,100 |  | $ 145,100 |  |  |  |  |
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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