Stock-Based Compensation Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 26,681	$ 28,740	$ 53,001	$ 50,846
Cost of Sales [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	1,763	2,077	3,727	4,069
Research and Development [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	12,934	14,831	27,626	25,336
Selling, General and Administrative Expenses [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 11,984	$ 11,832	$ 21,648	$ 21,441