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Income Taxes - Narrative (Details)
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]        
Effective income tax rate 0.51% (0.36%) (0.64%) (0.06%)
Foreign Tax Authority | Office of the Tax Commissioner, Bermuda        
Income Tax Contingency [Line Items]        
Federal statutory tax rate     0.00%