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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of contract liabilities (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2024
CNY (¥)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
CNY (¥)
Sep. 30, 2022
CNY (¥)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Beginning balance ¥ 114,806   ¥ 60,551 ¥ 45,754
Derecognition of contract liability (1,410)   (772) (2,031)
Customer prepayments 71,757   142,719 65,539
Revenue recognized (106,459)   (87,692) (48,711)
Ending balance ¥ 78,694 $ 11,230 ¥ 114,806 ¥ 60,551