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Stock-Based Compensation (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 3,726	$ 7,608
Stock-based compensation expensed from inventory	12	(81)
Total stock-based compensation expense	3,714	7,689
Stock Options [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	602	1,488
Restricted Stock Units [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 3,124	$ 6,120

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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