STOCK-BASED COMPENSATION: Stock-based compensation activity, by award type (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based compensation
Other non-employee stock-based compensation	$ 900	$ 900
Total non-cash stock-based compensation	61,600	38,900
Stock-based compensation of discontinued operations	62,900	7,800
Total non-cash stock-based compensation included in the condensed consolidated statement of equity	113,713	46,700
Pacific Data Partners LLC
Share-based compensation
Share-based compensation expense	11,800
Stock options
Share-based compensation
Share-based compensation expense	2,600	4,000
Performance stock
Share-based compensation
Share-based compensation expense	200	900
Restricted stock units
Share-based compensation
Share-based compensation expense	34,600	21,600
Arbor Holdback Agreement | Arbor
Share-based compensation
Share-based compensation expense	11,500	11,500
Pacific Data Partners, LLC Agreement Plan | Pacific Data Partners LLC
Share-based compensation
Share-based compensation expense	11,800	0
Liability-based equity awards
Share-based compensation
Total non-cash stock-based compensation	$ (10,800)	$ 0