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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of revenue (Details) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2018
Disaggregation of Revenue [Line Items]        
Revenue $ 19,029,760 $ 82,613,764 $ 123,318,661  
Tax and surcharges (228,154) (773,382) (890,414)  
Cash incentives (7,366,546) (20,509,878) (15,170,406)  
NET REVENUES 11,435,060 61,330,504 107,257,841  
Cumulative impact on accumulated retained earnings (1,429,623) 69,768,756    
ASU 2014-09 | Restatement        
Disaggregation of Revenue [Line Items]        
NET REVENUES   189,686    
Cumulative impact on accumulated retained earnings   189,686   $ 189,686
Loan facilitation service        
Disaggregation of Revenue [Line Items]        
Revenue 3,666,244 66,782,312 117,984,295  
Post-origination service        
Disaggregation of Revenue [Line Items]        
Revenue 7,086,591 11,418,182 4,213,862  
Interest income        
Disaggregation of Revenue [Line Items]        
Revenue 4,511,969 3,552,983 590,122  
Recommendation service        
Disaggregation of Revenue [Line Items]        
Revenue 3,754,738 858,796    
Loan management service        
Disaggregation of Revenue [Line Items]        
Revenue 0 0 508,948  
Others        
Disaggregation of Revenue [Line Items]        
Revenue $ 10,218 $ 1,491 $ 21,434