Stock-Based Compensation Plans (Details) (Employee Stock Purchase Plan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 22,106	$ 20,954
Cost of Revenues [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	1,992	1,804
Research and Development [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	10,505	10,219
Selling, General and Administrative Expenses [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 9,609	$ 8,931