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FAIR VALUE OF FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Fair value of assets and liabilities |  |
Assets of non-qualified retirement plan | $ 14,344 | $ 13,551
Other current assets | 40,167 | $ 41,145
Fair value measurements on recurring basis | Total |  |
Fair value of assets and liabilities |  |
Other current assets | 14,344 |
Total assets | 14,344 |
Fair value measurements on recurring basis | Total | Level 1 |  |
Fair value of assets and liabilities |  |
Assets of non-qualified retirement plan | 14,344 |
Total assets | 14,344 |
Fair value measurements on recurring basis | Total | Level 2 |  |
Fair value of assets and liabilities |  |
Other current assets | 0 |
Total assets | 0 |
Fair value measurements on recurring basis | Total | Level 3 |  |
Fair value of assets and liabilities |  |
Other current assets | 0 |
Total assets | $ 0 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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