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LOANS AND BORROWINGS - Particulars of unsecured long-term loans and borrowings (Details) - CNY (¥)
¥ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Unsecured long-term loans and borrowings    
Outstanding loan under credit facility ¥ 7,500  
Unsecured Debt    
Unsecured long-term loans and borrowings    
Principal amount of credit facility   ¥ 9,000
Outstanding loan under credit facility ¥ 7,500  
Effective interest rate (as a percent) 5.70%