RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Summary of restructuring activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Restructuring charges and adjustments	$ 1,800	$ 0
Restructuring Reserve, at the end of the period	5,500
Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	10,283
Restructuring charges and adjustments	1,800
Payments	(627)
Restructuring Reserve, at the end of the period	11,456
Continuing operations | Associate-related reserves
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	4,595
Restructuring charges and adjustments	1,879
Payments	(471)
Restructuring Reserve, at the end of the period	6,003
Continuing operations | Lease accruals
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	5,688
Restructuring charges and adjustments	(79)
Payments	(156)
Restructuring Reserve, at the end of the period	$ 5,453