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Financial and Other Guarantees (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Standard and Extended Product Warranty Accrual $ 7,194 $ 6,872 $ 6,861 $ 5,909
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued 11,177 12,305 11,823  
Standard Product Warranty Accrual, Decrease for Payments $ (10,855) $ (12,294) $ (10,871)