Debt - OpCo Financing Facility (Details)		12 Months Ended
	May 19, 2023 USD ($) project	Oct. 31, 2023 USD ($)	Oct. 31, 2021 USD ($)	May 22, 2023
Debt Instrument [Line Items]
Number of leased projects ownership reacquired | project	3
Payments of debt issuance costs		$ 3,469,000	$ 363,000
Proceeds from the issuance of debt		100,500,000	$ 10,175,000
Bridgeport Fuel Cell Project
Debt Instrument [Line Items]
Encumbrance amount	$ 11,400,000
Bridgeport Fuel Cell Project | Liberty Bank, Fifth Third Bank and Connecticut Green Bank
Debt Instrument [Line Items]
Repayments of debt	11,400,000
Pfizer Project
Debt Instrument [Line Items]
Future payments included in financing obligation for the remaining lease	15,700,000
Riverside Regional Water Quality Control Plant Project
Debt Instrument [Line Items]
Future payments included in financing obligation for the remaining lease	3,700,000
Santa Rita Jail Project
Debt Instrument [Line Items]
Future payments included in financing obligation for the remaining lease	$ 2,800,000
OpCo Financing Facility
Debt Instrument [Line Items]
Number of projects serving as security | project	6
Payments of debt issuance costs	$ 2,900,000
Funds released from restricted and unrestricted reserve account	7,300,000
Capital expenditure reserve funded out of debt	14,500,000
Funds Released from Restricted Cash	11,200,000
Proceeds from debt, distributed to company	34,900,000
Unrestricted cash	46,100,000
Capital Expenditure Reserve	$ 29,000,000.0
Debt Instrument, Period After Closing To Enter Hedge Transaction	30 days
Gain from fair value adjustment of debt		3,300,000
Threshold annual operating expense budget as percent of base case model, approval from lenders	115.00%
Annual operating expense budget approval from lenders, lending percent	50.00%
Trailing period for debt service coverage ratio	12 months
Debt service coverage ratio, testing frequency	6 months
Quarterly principal payment	$ 675,000
Proceeds from the issuance of debt	77,600,000	80,500,000
Long-term line of credit		77,510,000
OpCo Financing Facility | Sale-leaseback Arrangements with PNC
Debt Instrument [Line Items]
Repayments of debt	$ 15,000,000.0
OpCo Financing Facility | Interest Rate Swap | First four years
Debt Instrument [Line Items]
Net interest rate				6.366%
OpCo Financing Facility | Interest Rate Swap | Thereafter
Debt Instrument [Line Items]
Net interest rate				6.866%
OpCo Financing Facility | LIPA Yaphank Solid Waste Management Project
Debt Instrument [Line Items]
Extension term of gas agreement	3 years
Period to exercise option to purchase member interest in tax equity partnership	6 months
OpCo Financing Facility | Maximum
Debt Instrument [Line Items]
Notional amount of hedge	105.00%
OpCo Financing Facility | Minimum
Debt Instrument [Line Items]
Notional amount of hedge	75.00%
Debt service coverage ratio	1.20%
OpCo Financing Facility | Letter of credit
Debt Instrument [Line Items]
Term to maintain debt service coverage ratio	6 months
Line of credit facility, maximum borrowing capacity	$ 6,500,000
OpCo Financing Facility | Senior Term Loan
Debt Instrument [Line Items]
Principal amortization period	17 years
Debt instrument term	7 years
Line of credit facility, maximum borrowing capacity	$ 80,500,000
Debt service coverage ratio	1.30%
Debt instrument, face amount	$ 80,500,000
OpCo Financing Facility | Senior Term Loan | Applicable interest period one
Debt Instrument [Line Items]
Interest period	1 month
OpCo Financing Facility | Senior Term Loan | Applicable interest period two
Debt Instrument [Line Items]
Interest period	3 months
OpCo Financing Facility | Senior Term Loan | Applicable interest period three
Debt Instrument [Line Items]
Interest period	6 months
OpCo Financing Facility | Senior Term Loan | SOFR rate
Debt Instrument [Line Items]
Initial interest period	3 months
OpCo Financing Facility | Senior Term Loan | SOFR rate | First four years
Debt Instrument [Line Items]
Interest rate, basis points	2.50%
OpCo Financing Facility | Senior Term Loan | SOFR rate | Thereafter
Debt Instrument [Line Items]
Interest rate, basis points	3.00%
OpCo Financing Facility | Senior Term Loan | Base rate | First four years
Debt Instrument [Line Items]
Interest rate, basis points	1.50%
OpCo Financing Facility | Senior Term Loan | Base rate | Thereafter
Debt Instrument [Line Items]
Interest rate, basis points	2.00%
OpCo Financing Facility | Senior Term Loan | Interest Rate Swap
Debt Instrument [Line Items]
Notional amount of hedge				100.00%
Interest rate				3.716%
Connecticut Green Bank Notes
Debt Instrument [Line Items]
Repayments of debt	$ 1,800,000	$ 1,800,000
PNC Energy Capital, LLC
Debt Instrument [Line Items]
Repayments of debt	$ 7,300,000