INCOME TAX: - Income tax expense (benefit) attributable to earnings (loss) from continuing operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Current:
U.S. Federal	$ (33,715)	$ (39,534)	$ (33,626)
Non-U.S.	146	323	115
State	171	(16,092)	(4,414)
Total current income tax expense (benefit)	(33,398)	(55,303)	(37,925)
Deferred:
U.S. Federal	(5,103)	1,245	(26,884)
Non-U.S.	(1,006)	149	21
State	(769)	8,500	(935)
Total deferred income tax expense (benefit)	(6,878)	9,894	(27,798)
Total	$ (40,276)	$ (45,409)	$ (65,723)