INCOME TAXES: - Income tax expense (benefit) attributable to earnings (loss) from continuing operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Current:
U.S. Federal	$ (6,334)	$ 9,778	$ (2,410)
Non-U.S.	616	472	535
State	(79)	3,102	1,907
Current Income Tax Expense (Benefit)	(5,797)	13,352	32
Deferred:
U.S. Federal	(19,113)	(3,680)	(3,789)
Non-U.S.	549	405	(3,220)
State	1,590	(5,543)	(4,655)
Total deferred income taxes	(16,974)	(8,818)	(11,664)
Total income tax expense (benefit)	$ (22,771)	$ 4,534	$ (11,632)