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SHARE-BASED COMPENSATION (Details) (USD $)	12 Months Ended
SHARE-BASED COMPENSATION (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Expense
Total share-based compensation expense	$ 34,716,000	$ 28,826,000	$ 19,832,000
Share based compensation expense capitalized	600,000	400,000	600,000
Cost of goods manufactured and sold
Share-based Compensation Expense
Total share-based compensation expense	4,375,000	2,962,000	1,725,000
Research and development
Share-based Compensation Expense
Total share-based compensation expense	9,078,000	8,784,000	6,218,000
Selling, general and administrative
Share-based Compensation Expense
Total share-based compensation expense	$ 21,263,000	$ 17,080,000	$ 11,889,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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