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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Components of Property, Plant and Equipment      
Property, plant and equipment, gross $ 101,728 $ 89,988  
Accumulated depreciation (45,740) (38,812)  
Property, plant and equipment, net 55,988 51,176  
Depreciation expense 8,800 10,000 $ 10,100
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 16,508 13,960  
Machinery      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 42,299 38,761  
Computer equipment      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 22,396 20,716  
Furniture and fixtures      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 3,242 3,200  
Leasehold improvements      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross 8,964 9,090  
Construction in progress      
Components of Property, Plant and Equipment      
Property, plant and equipment, gross $ 7,769 $ 3,711