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Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jan. 31, 2020 | Oct. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents | $ 35,700 | $ 30,300
Restricted cash and cash equivalents - long-term | $ 27,481 | 26,871
Letter of credit date of expiration | Aug. 31, 2028 |
Letters of credit outstanding, amount | $ 5,700 | 5,700
Groton CT [Member] | Minimum [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Balance to become unrestricted upon certain performance related to Groton project | 30,000 |
Finance Obligations for Sale Leaseback Agreements [Member] | PNC Energy Capital, LLC [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Reserves for obligations | 18,100 | 17,900
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Reserves for obligations | 5,000 |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Groton CT [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Balance to become unrestricted upon certain performance related to Groton project | 30,000 |
Bridgeport Fuel Cell Project [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash | 4,900 |
Dominion Bridgeport FuelCell Park [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents - long-term | $ 5,900 | $ 4,900

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