FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Fair value of assets and liabilities
Other current assets	$ 37,187	$ 34,975
Fair value measurements on recurring basis | Level 1
Fair value of assets and liabilities
Other current assets	14,815
Total assets	14,815
Fair value measurements on recurring basis | Level 2
Fair value of assets and liabilities
Other accrued expenses	188
Total liabilities	188
Fair value measurements on recurring basis | Total
Fair value of assets and liabilities
Other current assets	14,815
Total assets	14,815
Other accrued expenses	188
Total liabilities	$ 188