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INCOME TAX - Reconciles the PRC statutory rates to the Company's effective tax rate (Details)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
INCOME TAX      
PRC Income tax statutory rate 25.00% 25.00% 25.00%
Effect of tax holiday and preferential tax rate (3.00%) (48.10%) (10.70%)
Effect of withholding income tax (28.40%) 17.80%  
Non-deductible expenses and others   30.60% 0.10%
Effective tax rate (6.40%) 25.30% 14.40%