Discontinued Operations and Assets Held For Sale (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended
	Jan. 01, 2012	Jan. 02, 2011	Jan. 01, 2012	Jan. 02, 2011	Jan. 01, 2012 Fixed Assets [Member]	Jan. 01, 2012 Intangible Assets [Member]	Oct. 02, 2011 Asset Purchase Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash held in escrow account related to divestiture							$ 6,000,000
Cash proceeds from sale			51,670,000	0			58,744,000
Fixed assets transferred to Qualcomm							(434,000)
Goodwill write-off			(8,568,000)				(8,568,000)
Intangible assets write-off							(1,818,000)
License write-off							(525,000)
Transaction and other costs							(1,460,000)
Gain on divestiture	0	0	45,939,000	0			45,939,000
Long Lived Assets Held-for-sale [Line Items]
Fixed assets classified as available for sale					1,000,000	700,000
Results of discontinued operations [Abstract]
Revenues	2,229,000	5,706,000	7,333,000	17,695,000
Cost of revenue	2,745,000	4,248,000	9,309,000	12,263,000
Operating expenses	4,774,000	6,582,000	18,310,000	20,836,000
Gain on divestiture	0	0	45,939,000	0			45,939,000
Benefit for income taxes	0	(21,000)	(89,000)	(64,000)
Net income (loss) from discontinued operations	$ (5,290,000)	$ (5,103,000)	$ 25,742,000	$ (15,340,000)