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Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Income Tax Disclosure [Abstract]          
Income tax expense $ 1,584,000 $ 566,000 $ 4,548,000 $ 496,000  
Unrecognized tax benefits         $ 0