ALLOWANCE FOR CREDIT LOSSES: Summary of the activity of the allowance for doubtful accounts, returns and credits (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 9,012	$ 7,575
Provision for doubtful accounts	824	3,346	$ 3,683
Other changes	72	128
Bad debts written off, net of amounts recovered	(590)	(1,731)
Balance at end of period	$ 9,318	$ 9,318