v3.25.0.1
Related-Party Transactions - Narrative (Details) - USD ($)
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Related Party Transaction [Line Items]      
Total revenue $ 186,788,000 $ 363,956,000  
Provision for receivables from related parties 0   $ 0
Consulting Services Revenue      
Related Party Transaction [Line Items]      
Total revenue $ 1,600,000 $ 1,400,000  
AES Grid Stability | Class B-1 common stock | Fluence Energy, Inc      
Related Party Transaction [Line Items]      
Investment owned (in shares) 51,499,195    
Siemens Industry | Class A common stock | Fluence Energy, Inc      
Related Party Transaction [Line Items]      
Investment owned (in shares) 51,499,195