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Stock-Based Compensation (Details 1) (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 of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 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
Stock Options [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	935	1,646	3,024	4,207
Restricted Stock Units [Member]
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
Stock options (including employee stock purchase program)	$ 5,276	$ 2,824	$ 18,427	$ 7,533

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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