Segment Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Dec. 30, 2011	Dec. 31, 2010
Revenue information by geographic area
Revenue information by geographic area - United States	$ 165,660	$ 165,763	$ 495,621	$ 493,863
Total revenue information by geographic area	204,964	195,941	623,089	585,834
Europe, Middle East and Africa [Member]
Revenue information by geographic area
Revenue information by geographic area	25,107	20,301	82,347	62,502
Asia, Pacific [Member]
Revenue information by geographic area
Revenue information by geographic area	4,586	5,870	16,583	18,715
North America other than United States [Member]
Revenue information by geographic area
Revenue information by geographic area	7,763	2,370	17,476	5,469
Latin America [Member]
Revenue information by geographic area
Revenue information by geographic area	$ 1,848	$ 1,637	$ 11,062	$ 5,285