RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Summary of restructuring activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Restructuring Reserve [Roll Forward]
Restructuring charges and adjustments	$ 1,286	$ (100)
Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	8,043
Restructuring charges and adjustments	1,286
Payments	(3,258)
Restructuring Reserve, at the end of the period	6,071
Continuing operations | Associate-related reserves
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	2,751
Restructuring charges and adjustments	1,286
Payments	(2,923)
Restructuring Reserve, at the end of the period	1,114
Continuing operations | Lease accruals
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	5,292
Restructuring charges and adjustments	0
Payments	(335)
Restructuring Reserve, at the end of the period	$ 4,957