Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended
	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 29, 2015	Mar. 30, 2014	Mar. 31, 2013	May 30, 2014	Aug. 01, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment										$ 2,161,000
Less book value of assets sold and direct costs related to the sale:
Goodwill										(7,323,000)
Results of discontinued operations [Abstract]
Restructuring Charges									19,383,000	5,538,000	5,834,000
Net loss from discontinued operations	(1,117,000)	(14,483,000)	(9,804,000)	4,732,000	(5,033,000)	(10,391,000)	(3,760,000)	(3,765,000)	(20,672,000)	(22,949,000)	(22,883,000)
High-Speed Converter Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment										2,200,000
Long-lived assets impairment										2,600,000
Cash Held in Escrow Related to Discontinued Operations												2,700,000
Holding period for escrow deposit												18 months
Disposal Group, Including Discontinued Operation, Assets, Noncurrent												8,500,000
Cash proceeds from sale (including amounts held in escrow)									18,000,000			18,000,000
Less book value of assets sold and direct costs related to the sale:
Intangible assets									(990,000)
Transaction and other costs									170,000
Gain (Loss) on Disposition of Business									16,840,000	0	0
Results of discontinued operations [Abstract]
Revenues									3,803,000	3,466,000	2,784,000
Cost of revenue									1,939,000	2,935,000	2,908,000
Goodwill and long-lived assets impairment									8,471,000	4,797,000	0
Restructuring Charges		11,900,000							18,305,000	0	0
Operating expenses									12,325,000	18,622,000	18,398,000
Other income									0	(50,000)	0
Income tax expense									275,000	11,000	113,000
Net loss from discontinued operations									(20,672,000)	(22,949,000)	(18,635,000)
Fixed assets held-for-sale	0				2,900,000				0	2,900,000		2,900,000
Intangible assets held-for-sale												5,600,000
Synaptics asset purchase agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from sale (including amounts held in escrow)													5,000,000
Less book value of assets sold and direct costs related to the sale:
Fixed assets													(1,963,000)
Goodwill													(700,000)
Inventories													(1,288,000)
Transaction and other costs													(163,000)
Gain on divestiture													886,000
Results of discontinued operations [Abstract]
Employees transferred to synaptics (employees)													47
Video Business
Results of discontinued operations [Abstract]
Revenues											2,429,000
Cost of revenue											3,006,000
Operating expenses											4,554,000
Gain on divestiture											886,000
Income tax expense											3,000
Net loss from discontinued operations											$ (4,248,000)