Property and Equipment (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 170,795	$ 181,874
Accumulated depreciation and amortization		(118,943)	(154,078)
Property and equipment, net		51,852	27,796
Depreciation expense		18,100	11,400	$ 11,200
Proceeds from sale of land and building		0	14,625	$ 0
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross		3,554	3,516
Computer and test equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		148,995	158,117
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		3,880	7,028
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		14,366	$ 13,213
Land and Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 30,900
Accumulated depreciation and amortization	(17,900)
Proceeds from sale of land and building	14,600
Gain (Loss) on Disposition of Property Plant Equipment	$ 1,600
Lease term	8 years
Restructuring
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 1,500