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Nature of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended	10 Months Ended
	May 19, 2023	Jul. 12, 2022	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2023	Oct. 31, 2022
Nature Of Business And Basis Of Presentation [Line Items]
Cash and cash equivalents, unrestricted			$ 246,844		$ 246,844	$ 246,844	$ 458,055
Investments - short-term			$ 76,400		$ 76,400	$ 76,400
Shares remaining under the plan			75,600,000		75,600,000	75,600,000
US Treasury Securities
Nature Of Business And Basis Of Presentation [Line Items]
US Treasury Notes purchased					$ 138,200
US Treasury Securities sold					63,300
Investments - short-term			$ 76,400		$ 76,400	$ 76,400	$ 0
Non-Recourse Project Financing Facility | Subsequent Event
Nature Of Business And Basis Of Presentation [Line Items]
Repayments of debt	$ 1,800
Unrestricted cash	46,100
Common Stock
Nature Of Business And Basis Of Presentation [Line Items]
Stock issued during period shares new issues			949,438	19,896,904
Common Stock | 2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC
Nature Of Business And Basis Of Presentation [Line Items]
Average sale price per share			$ 3.02		$ 3.02	$ 3.60
Gross proceeds from issuance of common stock			$ 2,900		$ 2,900	$ 70,000
Stock issued during period shares new issues			900,000		900,000	19,400,000
Shares remaining under the plan			75,600,000		75,600,000	75,600,000
Common Stock | 2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Maximum
Nature Of Business And Basis Of Presentation [Line Items]
Aggregate number of shares to be offered		95,000,000.0
Stock issued during period shares new issues		95,000,000.0
Liberty Bank, Fifth Third Bank and Connecticut Green Bank | Subsequent Event
Nature Of Business And Basis Of Presentation [Line Items]
Repayments of debt	11,400
Liberty Bank and Fifth Third Bank | Subsequent Event
Nature Of Business And Basis Of Presentation [Line Items]
Unrestricted cash	46,100
Funds Released from Restricted Cash	11,200
Liberty Bank and Fifth Third Bank | Non-Recourse Project Financing Facility | Subsequent Event
Nature Of Business And Basis Of Presentation [Line Items]
Funds Released from Restricted Cash	$ 11,200

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