RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Summary of restructuring activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring charges and adjustments	$ (100)	$ 279
Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	6,708
Restructuring charges and adjustments	(100)
Payments	(2,111)
Restructuring Reserve, at the end of the period	4,497
Continuing operations | Associate-related reserves
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	2,400
Restructuring charges and adjustments	(100)
Payments	(1,313)
Restructuring Reserve, at the end of the period	987
Continuing operations | Lease accruals
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period	4,308
Restructuring charges and adjustments	0
Payments	(798)
Restructuring Reserve, at the end of the period	$ 3,510