v3.26.1
Supply Chain Financing (Details)
$ in Millions
9 Months Ended
Jun. 30, 2026
USD ($)
supplier
party
Jun. 11, 2026
USD ($)
Aug. 08, 2025
USD ($)
Supplier Finance Program [Line Items]      
Extended payment terms period 120 days    
Number of parties involved | party 2    
Number of suppliers | supplier 0    
Outstanding obligations $ 93.9    
Payment terms, threshold days 120 days    
Decrease in cash used in operating activities due to impact of the agreements between the Company's suppliers and the New SCF Bank $ 101.9    
Increase in investing cash inflow due to impact of the agreements between the Company's suppliers and the New SCF Bank $ 77.2    
Minimum      
Supplier Finance Program [Line Items]      
Confirmed payment terms period 45 days    
Maximum      
Supplier Finance Program [Line Items]      
Confirmed payment terms period 180 days    
New SCF Facility      
Supplier Finance Program [Line Items]      
Number of suppliers | supplier 2    
Revolving Credit Facility | New SCF Facility | Line of Credit      
Supplier Finance Program [Line Items]      
Maximum borrowing capacity   $ 185.0 $ 150.0
Affiliated Entity      
Supplier Finance Program [Line Items]      
Guarantees issued $ 100.0    
AES Grid Stability | Affiliated Entity      
Supplier Finance Program [Line Items]      
Guarantees issued 50.0    
Siemens Industry | Affiliated Entity      
Supplier Finance Program [Line Items]      
Guarantees issued $ 50.0