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Stock-Based Compensation (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 3,836	$ 7,632	$ 7,562	$ 15,240
Stock-based compensation expensed from inventory	2	(2)	14	(83)
Total stock-based compensation expense	3,834	7,634	7,548	15,323
Stock Options [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	737	601	1,339	2,089
Restricted Stock Units [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 3,099	$ 7,031	$ 6,223	$ 13,151

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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