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Stock-Based Compensation (Summary Of Stock-Based Compensation Expense By Financial Statement Line Item) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	$ 2,118	$ 2,248	$ 7,697	$ 10,073
Cost Of Revenues [Member]
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	138	(6)	908	828
Research And Development [Member]
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	623	237	1,948	1,396
Selling, General And Administrative [Member]
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	$ 1,357	$ 2,017	$ 4,841	$ 7,849

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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