Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2012		Oct. 02, 2011		Sep. 30, 2012		Oct. 02, 2011
Segment Reporting Information [Line Items]
Revenues	$ 133,401		$ 138,318		$ 263,562		$ 287,603
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	18,100		17,100		36,500		36,000
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	85,979		91,203		171,849		193,766
Americas [Member]
Segment Reporting Information [Line Items]
Revenues	20,199	[1]	18,112	[1]	40,101	[1]	37,765	[1]
Japan [Member]
Segment Reporting Information [Line Items]
Revenues	10,911		11,913		22,371		23,046
Europe [Member]
Segment Reporting Information [Line Items]
Revenues	$ 16,312		$ 17,090		$ 29,241		$ 33,026

[1] The revenues from the customers in the U.S. were $18.1 million and $17.1 million in the three months ended September 30, 2012 and October 2, 2011, respectively. The revenues from the customers in the U.S. were $36.5 million and $36.0 million in the six months ended September 30, 2012 and October 2, 2011, respectively.