STOCK-BASED COMPENSATION - Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Stock-based compensation expense
Stock-based compensation expense before income taxes	$ 110,472	$ 257,881	$ 247,700
Income tax benefit	(21,746)	(48,687)	(48,383)
Stock-based compensation expense, net of income tax benefit	88,726	209,194	199,317
Capitalized stock-based compensation expense	30,124	24,451	75,725
Cost of goods sold
Stock-based compensation expense
Stock-based compensation expense before income taxes	8,707	154,031	149,075
Selling and marketing
Stock-based compensation expense
Stock-based compensation expense before income taxes	18,348	18,680	23,685
General and administrative
Stock-based compensation expense
Stock-based compensation expense before income taxes	56,830	53,607	51,903
Research and development
Stock-based compensation expense
Stock-based compensation expense before income taxes	$ 26,587	$ 31,563	$ 23,037