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Stock-Based Compensation (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Summary of Stock-Based Compensation Expense
Stock based compensation	$ 6,211	$ 4,470	$ 21,451	$ 11,740
Stock-based compensation expensed from inventory	11	(37)	94	(5)
Total stock-based compensation expense	6,222	4,433	21,545	11,735
Cost of Revenues [Member]
Summary of Stock-Based Compensation Expense
Stock based compensation	147	120	502	297
Research and Development [Member]
Summary of Stock-Based Compensation Expense
Stock based compensation	2,814	2,647	10,733	6,761
Selling, General and Administrative [Member]
Summary of Stock-Based Compensation Expense
Stock based compensation	$ 3,250	$ 1,703	$ 10,216	$ 4,682

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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