RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Narrative (Details) - USD ($) $ in Thousands	12 Months Ended			48 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	$ 1,725	$ 3,430	$ 7,745
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	600			$ 600
Employee Severance | Restructuring Activity 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		2,300
Facility Closing | Restructuring Activity 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			800
Facility Closing | Restructuring Activity 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	(900)	1,100	900	7,300
Restructuring reserve	3,900			3,900
Facility Closing | Restructuring Activity 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	1,000
United States and Europe | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	1,700
United States | Employee Severance | Restructuring Activity 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		1,700
Asia-Pacific ("APAC") | Employee Severance | Restructuring Activity 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		$ 600
United States And Asia Pacific | Employee Severance | Restructuring Activity 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			$ 6,100
Restructuring reserve	$ 200			$ 200