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Accounting Principles and Practices (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]      
Document Fiscal Year (linked throughout the document) - not tagged 2020    
Advertising Expense $ 1,648 $ 2,452 $ 2,683
Movement in Standard Product Warranty Accrual [Roll Forward]      
Balance at beginning of year 3,634 3,791  
Accrual for warranties issued 2,723 3,405  
Warranties settled (2,548) (3,625)  
Balance at end of year $ 3,581 $ 3,634 $ 3,791