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DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Warranty Obligation (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Changes in the Warranty Obligation [Roll Forward]    
Warranty obligation at beginning of period $ 8,537 $ 7,717
Warranty provision related to products shipped 4,649 4,520
Deductions for warranty claims processed (4,742) (4,257)
Adjustments related to preexisting warranties 96 193
Warranty obligation at end of period $ 8,540 $ 8,173