Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 Segment	Apr. 02, 2011	Apr. 03, 2010
Net long-lived assets by country
Net long-lived assets	$ 394,982	$ 380,570	$ 365,878
Segment Information (Textual) [Abstract]
Number of operating segment	1
United States [Member]
Net long-lived assets by country
Net long-lived assets	254,811	247,187	245,698
Ireland [Member]
Net long-lived assets by country
Net long-lived assets	53,255	55,370	57,369
Singapore [Member]
Net long-lived assets by country
Net long-lived assets	66,806	69,043	56,869
Foreign Other [Member]
Net long-lived assets by country
Net long-lived assets	20,110	8,970	5,942
Total Foreign [Member]
Net long-lived assets by country
Net long-lived assets	$ 140,171	$ 133,383	$ 120,180