OTHER CURRENT ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
OTHER CURRENT ACCRUED LIABILITIES [Abstract]
Accrued liabilities for customer sales incentive programs	$ 9,783	$ 7,181
Other current accrued liabilities	4,028	3,825
Total other current accrued liabilities	$ 13,811	$ 11,006