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Stock-Based Compensation (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 7,632	$ 3,095	$ 15,240	$ 7,270
Stock-based compensation expensed from inventory	2	29	83	32
Total stock-based compensation expense	7,634	3,124	15,323	7,302
Stock Options [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	601	992	2,089	2,561
Restricted Stock Units [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 7,031	$ 2,103	$ 13,151	$ 4,709

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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