Discontinued Operations and Assets Held For Sale (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended	3 Months Ended		3 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011	Aug. 03, 2012 Synaptics asset purchase agreement [Member]	Sep. 30, 2012 Synaptics asset purchase agreement [Member]	Aug. 01, 2012 Synaptics asset purchase agreement [Member]	Oct. 02, 2011 Asset Purchase Agreement [Member]
Long Lived Assets Held-for-sale [Line Items]
Proceeds from divestitures			$ 5,000	$ 51,670		$ 5,000		$ 58,744
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net							(1,963)
Revenues	1,451	2,902	2,429	5,103
Cost of revenue	1,112	4,038	3,006	6,564
Operating expenses	612	6,216	4,554	13,535
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	886	45,939	886	45,939
Benefit for income taxes	3	(60)	3	(89)
Net income (loss) from discontinued operations	610	38,647	(4,248)	31,032
Disposal Group, Assets of Business Transferred under Contractual Arrangement							1,288
Goodwill, Written off Related to Sale of Business Unit					(700)
Transaction and other costs						(163)
Gain (Loss) on Disposition of Assets						$ 886		$ 45,939