RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Summary of restructuring activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring charges and adjustments	$ 3,660	$ 929	$ 3,562	$ 1,208
Continuing operations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period			6,708
Restructuring charges and adjustments			3,562
Payments			(3,267)
Restructuring Reserve, at the end of the period	7,003		7,003
Continuing operations | Associate-related reserves
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period			2,400
Restructuring charges and adjustments			1,495
Payments			(2,586)
Restructuring Reserve, at the end of the period	1,309		1,309
Continuing operations | Lease accruals
Restructuring Reserve [Roll Forward]
Restructuring Reserve, at the beginning of the period			4,308
Restructuring charges and adjustments			2,067
Payments			(681)
Restructuring Reserve, at the end of the period	$ 5,694		$ 5,694