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Commitments and Contingencies - Changes in Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Changes in the warranty liability:        
Beginning of the period $ 28,853 $ 22,056 $ 27,573 $ 21,911
Assumed from business acquisition 351 1,230 351 1,230
Provision 11,020 5,414 19,320 9,715
Settlements (8,330) (4,611) (14,882) (9,179)
Currency translation (140) 260 (608) 672
End of the period $ 31,754 $ 24,349 $ 31,754 $ 24,349