STOCK-BASED COMPENSATION (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock-based compensation expense
Stock-based compensation expense	$ 35,765	$ 33,494	$ 28,765
Capitalized stock-based compensation expense	6,964	11,220	11,266
Total stock-based compensation expense	42,729	44,714	40,031
Stock-based compensation expense for non-employee awards	8,789	13,365	3,159
Cost of goods sold
Stock-based compensation expense
Stock-based compensation expense	10,060	5,144	10,695
Selling and marketing
Stock-based compensation expense
Stock-based compensation expense	5,562	5,042	4,659
General and administrative
Stock-based compensation expense
Stock-based compensation expense	17,824	19,963	9,781
Research and development
Stock-based compensation expense
Stock-based compensation expense	$ 2,319	$ 3,345	$ 3,630