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FAIR VALUE MEASUREMENTS - Assets and liabilities measured (Details) - CNY (¥)
¥ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets measured at fair value on recurring basis ¥ 58,568  
Liabilities measured at fair value on recurring basis 1,793,894 ¥ 4,803,286
Short-term investments - Wealth management product    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets measured at fair value on recurring basis 15,879  
Available for sale debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets measured at fair value on recurring basis 42,689  
2026 Convertible Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value on recurring basis   3,381,686
2027 Convertible Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value on recurring basis 1,793,894 1,421,600
Quoted prices in active markets for identical assets and liabilities (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value on recurring basis   3,381,686
Quoted prices in active markets for identical assets and liabilities (Level 1) | 2026 Convertible Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value on recurring basis   3,381,686
Significant other observable inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets measured at fair value on recurring basis 15,879  
Significant other observable inputs (Level 2) | Short-term investments - Wealth management product    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets measured at fair value on recurring basis 15,879  
Unobservable inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets measured at fair value on recurring basis 42,689  
Liabilities measured at fair value on recurring basis 1,793,894 1,421,600
Unobservable inputs (Level 3) | Available for sale debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets measured at fair value on recurring basis 42,689  
Unobservable inputs (Level 3) | 2027 Convertible Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value on recurring basis ¥ 1,793,894 ¥ 1,421,600