RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Summary of restructuring activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Restructuring Reserve [Roll Forward]
Restructuring charges and adjustments	$ 3,430	$ 7,745	$ 2,746
Restructuring Reserve, at the end of the period	6,200
Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	10,283	5,830	4,630
Restructuring charges and adjustments	3,430	7,745	2,746
Payments	(7,020)	(3,292)	(1,546)
Restructuring Reserve, at the end of the period	6,693	10,283	5,830
Continuing operations | Associate-related reserves
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	4,595	542	322
Restructuring charges and adjustments	2,291	6,163	182
Payments	(6,436)	(2,110)	38
Restructuring Reserve, at the end of the period	450	4,595	542
Continuing operations | Lease accruals
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	5,688	5,288	4,308
Restructuring charges and adjustments	1,139	1,582	2,564
Payments	(584)	(1,182)	(1,584)
Restructuring Reserve, at the end of the period	$ 6,243	$ 5,688	$ 5,288