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FAIR VALUE MEASUREMENTS - Key assumptions (Details) - 2027 Convertible Notes
Sep. 30, 2024
Sep. 30, 2023
Volatility    
FAIR VALUE MEASUREMENTS    
Convertible notes 0.80 0.9048
Discount rate    
FAIR VALUE MEASUREMENTS    
Convertible notes 0.1334 0.1578
Risk-free interest rate    
FAIR VALUE MEASUREMENTS    
Convertible notes 0.0363 0.047