STOCK-BASED COMPENSATION: - Effect of stock-based compensation expense on income, by financial statement line item (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based compensation
Total non-cash stock-based compensation	$ 61,475	$ 64,583
Cost of revenue
Share-based compensation
Total non-cash stock-based compensation	2,906	2,676
Research and development
Share-based compensation
Total non-cash stock-based compensation	21,796	20,975
Sales and marketing
Share-based compensation
Total non-cash stock-based compensation	20,871	25,568
General and administrative
Share-based compensation
Total non-cash stock-based compensation	$ 15,902	$ 15,364