STOCKHOLDERS' EQUITY: Effect of Stock-based Compensation Expense on Income, by Financial Statement Line Item (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Share-based compensation
Total non-cash stock-based compensation	$ 87,257	$ 111,707	$ 89,447
Cost of revenue
Share-based compensation
Total non-cash stock-based compensation	4,111	5,300	3,769
Research and development
Share-based compensation
Total non-cash stock-based compensation	32,112	38,960	23,260
Sales and marketing
Share-based compensation
Total non-cash stock-based compensation	28,586	40,401	38,026
General and administrative
Share-based compensation
Total non-cash stock-based compensation	$ 22,448	$ 27,046	$ 24,392