FINANCIAL INSTRUMENTS: (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Fair value of assets and liabilities
Other current assets	$ 53,405	$ 58,935
Fair value measurements on recurring basis | Level 1
Fair value of assets and liabilities
Other current assets	14,606
Total assets	14,606
Fair value measurements on recurring basis | Level 2
Fair value of assets and liabilities
Other accrued expenses	73
Total liabilities	73
Fair value measurements on recurring basis | Total
Fair value of assets and liabilities
Other current assets	14,606
Total assets	14,606
Other accrued expenses	73
Total liabilities	$ 73