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Income Taxes - Narrative (Details)
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Contingency [Line Items]        
Effective income tax rate 0.88% (0.02%) (1.56%) (0.02%)
Foreign Tax Authority | Office of the Tax Commissioner, Bermuda        
Income Tax Contingency [Line Items]        
Federal statutory tax rate     0.00%