FINANCIAL INSTRUMENTS: (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Fair value of assets and liabilities
Other current assets	$ 51,644	$ 54,484
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of assets and liabilities
Other current assets	14,069
Total assets	14,069
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of assets and liabilities
Other accrued expenses	175
Total liabilities	175
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair value of assets and liabilities
Other current assets	14,069
Total assets	14,069
Other accrued expenses	175
Total liabilities	$ 175