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Stock-Based Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Stock Based compensation expense
Allocated share-based compensation expense	$ 19,762	$ 17,843	$ 56,616	$ 48,509
Cost of Revenues [Member]
Stock Based compensation expense
Allocated share-based compensation expense	1,517	1,350	4,718	3,944
Research and Development [Member]
Stock Based compensation expense
Allocated share-based compensation expense	9,654	8,655	27,681	23,245
Selling, General And Administrative [Member]
Stock Based compensation expense
Allocated share-based compensation expense	$ 8,591	$ 7,838	$ 24,217	$ 21,320

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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