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Stockholders' Equity (Summary Of Stock-Based Compensation Expense By Financial Statement Line Item) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Component of Operating Other Cost and Expense [Line Items]
Total stock-based compensation expense	$ 9,864	$ 13,412	$ 13,494
Cost Of Revenues [Member]
Component of Operating Other Cost and Expense [Line Items]
Total stock-based compensation expense	1,121	1,188	1,199
Research And Development [Member]
Component of Operating Other Cost and Expense [Line Items]
Total stock-based compensation expense	2,562	1,977	2,023
Selling, General And Administrative [Member]
Component of Operating Other Cost and Expense [Line Items]
Total stock-based compensation expense	$ 6,181	$ 10,247	$ 10,272

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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