Debt (Details)		1 Months Ended		3 Months Ended	9 Months Ended
	May 19, 2023 USD ($) project	Apr. 30, 2024	Apr. 30, 2023 USD ($) position	Jul. 31, 2023 USD ($)	Jul. 31, 2023 USD ($)	May 22, 2023	Dec. 19, 2019 USD ($)
Debt Instrument [Line Items]
Term to maintain debt service coverage ratio	6 months
Notional amount of hedge						100.00%
Interest rate						3.716%
Gain from fair value adjustment of debt				$ 500,000	$ 500,000
Quarterly principal payment	$ 675,000
Trailing period for debt service coverage ratio	12 months
First four years
Debt Instrument [Line Items]
Interest rate						6.366%
Thereafter
Debt Instrument [Line Items]
Interest rate						6.866%
Liberty Bank, Fifth Third Bank and Connecticut Green Bank
Debt Instrument [Line Items]
Repayments of debt	$ 11,400,000
PNC Energy Capital, LLC
Debt Instrument [Line Items]
Funds released from restricted and unrestricted reserve account	$ 7,300,000
Minimum
Debt Instrument [Line Items]
Notional amount of hedge	75.00%
Maximum
Debt Instrument [Line Items]
Notional amount of hedge	105.00%
Project Financing Facility
Debt Instrument [Line Items]
Number of operating fuel cell generation projects | project	6
Number of leased projects ownership reacquired | project	3
Repayments of debt	$ 1,800,000
Payments of debt issuance costs	2,900,000
Net proceeds from debt	77,600,000
Payments for lease buyouts and sales taxes	15,000,000.0
Payments to fund capital expenditure reserve account	14,500,000
Proceeds from debt, distributed to company	34,900,000
Unrestricted cash	$ 46,100,000
Initial interest period	3 months
Principal amortization period	17 years
Debt service coverage ratio	1.30%
Debt instrument term	7 years
Capital Expenditure Reserve	$ 29,000,000.0
Future capital expenditures or long-term capital investments	29,000,000.0
Capital expenditure reserve funded out of debt	$ 14,500,000
Threshold annual operating expense budget as percent of base case model, approval from lenders	115.00%
Trailing period for debt service coverage ratio	12 months
Debt service coverage ratio, testing frequency	6 months
Project Financing Facility | Applicable interest period one
Debt Instrument [Line Items]
Interest period	1 month
Project Financing Facility | Applicable interest period two
Debt Instrument [Line Items]
Interest period	3 months
Project Financing Facility | Applicable interest period three
Debt Instrument [Line Items]
Interest period	6 months
Project Financing Facility | SOFR rate
Debt Instrument [Line Items]
Initial interest period	3 months
Project Financing Facility | SOFR rate | First four years
Debt Instrument [Line Items]
Interest rate, basis points	2.50%
Project Financing Facility | SOFR rate | Thereafter
Debt Instrument [Line Items]
Interest rate, basis points	3.00%
Project Financing Facility | Base rate | First four years
Debt Instrument [Line Items]
Interest rate, basis points	1.50%
Project Financing Facility | Base rate | Thereafter
Debt Instrument [Line Items]
Interest rate, basis points	2.00%
Project Financing Facility | Liberty Bank and Fifth Third Bank
Debt Instrument [Line Items]
Funds released from restricted cash	$ 11,200,000
Project Financing Facility | PNC Energy Capital, LLC
Debt Instrument [Line Items]
Number of leased projects ownership reacquired | project	3
Project Financing Facility | Bridgeport Fuel Cell Project [Member] | Liberty Bank, Fifth Third Bank and Connecticut Green Bank
Debt Instrument [Line Items]
Encumbrance amount	$ 11,400,000
Project Financing Facility | Pfizer Project | PNC Energy Capital, LLC | Sale-leaseback Arrangements with PNC
Debt Instrument [Line Items]
Lease buyout amount	15,700,000
Project Financing Facility | Riverside Regional Water Quality Control Plant Project | PNC Energy Capital, LLC | Sale-leaseback Arrangements with PNC
Debt Instrument [Line Items]
Lease buyout amount	3,700,000
Project Financing Facility | Santa Rita Jail Project | Sale-leaseback Arrangements with PNC
Debt Instrument [Line Items]
Lease buyout amount	$ 2,800,000
Project Financing Facility | LIPA Yaphank Solid Waste Management Project [Member]
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
Project Financing Facility | Minimum
Debt Instrument [Line Items]
Debt service coverage ratio	1.20%
Annual operating expense budget approval from lenders, lending percent	50.00%
Term loan
Debt Instrument [Line Items]
Debt instrument, face amount	$ 80,500,000
Funds released from restricted and unrestricted reserve account	7,300,000
Gross proceeds from debt	80,500,000
Letter of credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 6,500,000
Connecticut Green Bank Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount							$ 3,000,000.0
State of Connecticut Loan | Third Amendment
Debt Instrument [Line Items]
Number of consecutive months maintain full time positions			24 months
Number of minimum full time positions required to be maintained | position			91
Number of minimum full time positions required to be maintained including additional employment positions | position			629
Additional credits to be earned			$ 2,000,000.0
Consecutive term for average number of employees		24 months	24 months
Principal payable number of employee under employee obligation target			$ 14,225.00
State of Connecticut Loan | Employment Obligation [Member] | Third Amendment
Debt Instrument [Line Items]
Number of minimum full time positions required to be maintained | position			538