STOCK-BASED COMPENSATION: Stock-based compensation activity, by award type (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-based compensation
Other non-employee stock-based compensation	$ 300	$ 300
Total non-cash stock-based compensation	18,600	17,800
Stock-based compensation of discontinued operations	0	2,500
Total non-cash stock-based compensation included in the condensed consolidated statement of equity	15,064	16,811
Cost of revenue
Share-based compensation
Total non-cash stock-based compensation	800	700
Research and development
Share-based compensation
Total non-cash stock-based compensation	4,000	4,400
Sales and marketing
Share-based compensation
Total non-cash stock-based compensation	8,900	9,900
General and administrative
Share-based compensation
Total non-cash stock-based compensation	4,900	2,800
Stock options
Share-based compensation
Share-based compensation expense	700	1,000
Performance stock
Share-based compensation
Share-based compensation expense	0	300
Restricted stock units
Share-based compensation
Share-based compensation expense	11,100	8,500
Arbor Holdback Agreement | Arbor
Share-based compensation
Share-based compensation expense	2,600	3,800
Pacific Data Partners, LLC Agreement Plan | Pacific Data Partners LLC
Share-based compensation
Share-based compensation expense	3,900	3,900
Liability-based equity awards
Share-based compensation
Total non-cash stock-based compensation	$ (3,500)	$ (3,500)