FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Fair value of assets and liabilities
Other current assets	$ 34,919	$ 37,897
Fair value measurements on recurring basis | Level 1
Fair value of assets and liabilities
Other current assets	12,800
Total assets	12,800
Fair value measurements on recurring basis | Level 2
Fair value of assets and liabilities
Other accrued expenses	109
Total liabilities	109
Fair value measurements on recurring basis | Total
Fair value of assets and liabilities
Other current assets	12,800
Total assets	12,800
Other accrued expenses	109
Total liabilities	$ 109