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Commitments and Contingencies (Product Warranties) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in the warranty liability:    
Beginning of the period $ 20,380 $ 21,710
Assumed from business acquisition 1,963 0
Provision 15,341 9,772
Settlements (15,270) (11,339)
Currency translation (503) 237
End of the period $ 21,911 $ 20,380