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Related-Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	Aug. 11, 2021	Jun. 30, 2022	Sep. 30, 2021
Related Party Transaction [Line Items]
Borrowing from related parties		$ 0	$ 50,000
Provision for receivables from related parties		$ 0	$ 0
Common Class B-1
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)		58,586,695
Class A common stock
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)		114,112,407
Affiliated Entity | AES Grid Stability
Related Party Transaction [Line Items]
Borrowing from related parties	$ 25,000
Subordinated promissory note, annual interest percentage	2.86%
Affiliated Entity | AES Grid Stability | Common Class B-1
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)		58,586,695
Affiliated Entity | Siemens Industry
Related Party Transaction [Line Items]
Borrowing from related parties	$ 25,000
Subordinated promissory note, annual interest percentage	2.86%
Affiliated Entity | Siemens Industry | Class A common stock
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)		58,586,695

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