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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Components of Property, Plant and Equipment      
Property, plant and equipment, gross $ 89,988 $ 82,739  
Accumulated depreciation (38,812) (30,187)  
Property, plant and equipment, net 51,176 52,552  
Depreciation expense 10,000 10,100 $ 6,000
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 13,960 13,746  
Machinery      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 42,472 38,599  
Computer equipment      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 20,716 18,116  
Furniture and fixtures      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 3,200 2,924  
Leasehold improvements      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross $ 9,090 $ 8,804