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Commitments and Contingencies - Changes in Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in the warranty liability:        
Beginning of the period $ 22,056 $ 21,752 $ 21,911 $ 20,380
Assumed from business acquisition 1,230 150 1,230 1,963
Provision 5,414 3,163 9,715 6,340
Settlements (4,611) (3,452) (9,179) (6,880)
Currency translation 260 (1) 672 (191)
End of the period $ 24,349 $ 21,612 $ 24,349 $ 21,612