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Property, Plant and Equipment (Schedule of Property, Plant and Equipment, Net) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Components of Property, Plant and Equipment      
Property, plant and equipment, gross $ 82,739 $ 70,819  
Accumulated depreciation (30,187) (20,224)  
Property, plant and equipment, net 52,552 50,595  
Depreciation expense 10,100 6,000 $ 5,200
Land      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 550 550  
Building      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 13,746 13,156  
Machinery      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 38,599 31,456  
Computer equipment      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 18,116 15,440  
Furniture and fixtures      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 2,924 2,720  
Leasehold improvements      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross $ 8,804 $ 7,497