RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Gains, losses and other items (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Restructuring plan charges and adjustments	$ (18)	$ 899	$ 3,545	$ 2,107
Gain on disposition of Impact email business	0	(155)	0	(784)
Arbor and Circulate acquisition-related costs	0	1,365	0	1,365
Other	(23)	2	(24)	36
Gains, losses and other items, net	$ 41
Gains, losses and other items, net		$ 2,111	$ 3,521	$ 2,724