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Commitments and Contingencies - Changes in Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Changes in the warranty liability:        
Beginning of the period $ 35,814 $ 28,853 $ 34,229 $ 27,573
Assumed from business acquisition 0 351 0 351
Provision 8,509 11,020 17,044 19,320
Settlements (6,727) (8,330) (13,704) (14,882)
Currency translation (374) (140) (347) (608)
End of the period $ 37,222 $ 31,754 $ 37,222 $ 31,754