Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Summary of stock-based compensation expense
Stock-based compensation expense	$ 9,277	$ 9,667
Total continuing operations [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	9,277	9,190
Cost of revenues [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	770	741
Engineering and development [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	4,318	4,396
Sales and marketing [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	1,965	1,682
General and administrative [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	2,224	2,371
Discontinued operations [Member]
Summary of stock-based compensation expense
Stock-based compensation expense		$ 477