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Commitments and Contingencies (Product Warranties) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Changes in the warranty liability:    
Beginning of the period $ 21,911 $ 20,380
Assumed from business acquisition 1,230 1,963
Provision 25,103 15,341
Settlements (21,766) (15,270)
Currency translation 1,095 (503)
End of the period $ 27,573 $ 21,911