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Commitments and Contingencies- Changes in Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Changes in the warranty liability:        
Beginning of the period $ 21,284 $ 23,420 $ 21,710 $ 24,380
Provision 1,792 2,020 3,934 4,226
Settlements (2,677) (3,236) (5,245) (6,402)
End of the period $ 20,399 $ 22,204 $ 20,399 $ 22,204