RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Summary of restructuring activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Restructuring Reserve [Roll Forward]
Restructuring charges and adjustments	$ (19)	$ 1,725	$ 3,430
Employee-related reserves
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the end of the period	100
Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	4,743	6,693	10,283
Restructuring charges and adjustments	(19)	1,725	3,430
Payments	(1,650)	(3,675)	(7,020)
Restructuring Reserve, at the end of the period	3,074	4,743	6,693
Continuing operations | Employee-related reserves
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	825	450	4,595
Restructuring charges and adjustments	0	1,663	2,291
Payments	(778)	(1,288)	(6,436)
Restructuring Reserve, at the end of the period	47	825	450
Continuing operations | Lease accruals
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	3,918	6,243	5,688
Restructuring charges and adjustments	(19)	62	1,139
Payments	(872)	(2,387)	(584)
Restructuring Reserve, at the end of the period	$ 3,027	$ 3,918	$ 6,243