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Stock-Based Compensation Plans (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Stock Based compensation expense
Allocated share-based compensation expense	$ 16,899	$ 15,421	$ 30,666	$ 30,541
Cost of Revenues [Member]
Stock Based compensation expense
Allocated share-based compensation expense	1,284	1,312	2,594	2,579
Research and Development [Member]
Stock Based compensation expense
Allocated share-based compensation expense	8,103	7,341	14,590	14,545
Selling, General And Administrative [Member]
Stock Based compensation expense
Allocated share-based compensation expense	$ 7,512	$ 6,768	$ 13,482	$ 13,417

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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