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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 1.4 $ 1.7 $ 8.9 $ 5.2
Change inrevised estimate of remaining useful lives | Cost of goods sold        
Property, Plant and Equipment [Line Items]        
Depreciation expense     $ 4.1