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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign currency translation and Segment reporting (Details)
12 Months Ended
Mar. 31, 2022
segment
Mar. 31, 2021
Foreign currency translation    
Year-end RMB 6.3393 6.5518
Year average RMB 6.4180 6.7834
Number of operating segments 2  
Number of reportable segments 2