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Summary of Significant Accounting Policies Income statement revision (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Interest and fee income $ 468,759,262 $ 495,133,436 $ 524,277,341
Personnel $ 171,958,682 $ 169,573,039 $ 192,419,147