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Stock-Based Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Stock Based compensation expense
Allocated share-based compensation expense	$ 17,843	$ 14,754	$ 48,509	$ 45,295
Cost of Revenues [Member]
Stock Based compensation expense
Allocated share-based compensation expense	1,350	1,092	3,944	3,671
Research and Development [Member]
Stock Based compensation expense
Allocated share-based compensation expense	8,655	7,120	23,245	21,665
Selling, General And Administrative [Member]
Stock Based compensation expense
Allocated share-based compensation expense	$ 7,838	$ 6,542	$ 21,320	$ 19,959

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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