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FAIR VALUE MEASUREMENTS - Assets and liabilities measured (Details) - CNY (¥) ¥ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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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

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