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Project Assets - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Jul. 31, 2020 USD ($) ProjectAsset | Jul. 31, 2019 USD ($) | Oct. 31, 2019 USD ($) ProjectAsset
Project Assets [Line Items] |  |  |  |  |  |
Long-term project assets | $ 160,921 | $ 160,921 |  | $ 160,921 |  | $ 144,115
Number of project assets | ProjectAsset |  |  |  | 8 |  | 7
Sale leaseback transaction, net book value | 74,800 | 74,800 |  | $ 74,800 |  | $ 59,200
Cash restricted for PNC Sale-Leaseback transactions | 15,026 | 15,026 |  | 15,026 |  | 17,934
Unrestricted cash and cash equivalents | 66,300 | 66,300 |  | 66,300 |  | 9,400
Project asset depreciation |  | 3,100 | $ 2,700 | 8,600 | $ 4,700 |
Long-term project assets construction in progress | 86,100 | 86,100 |  | 86,100 |  | $ 84,900
UCI Fuel Cell, LLC [Member] | PNC Energy Capital, LLC [Member] |  |  |  |  |  |
Project Assets [Line Items] |  |  |  |  |  |
Sale leaseback transaction expense | 4,300 |  |  |  |  |
Cash restricted for PNC Sale-Leaseback transactions | 3,000 | 3,000 |  | 3,000 |  |
Unrestricted cash and cash equivalents | $ 1,300 | $ 1,300 |  | $ 1,300 |  |

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