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

Non-Quailfied Retirement Plan, Assets For Plan Benefits, Current

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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

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- Definition

Amount of current assets classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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