Property and Equipment (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2014	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 184,267	$ 170,795
Accumulated depreciation and amortization		(134,786)	(118,943)
Property and equipment, net		49,481	51,852
Depreciation expense		18,400	18,100	$ 11,400
Proceeds from sale of land and building		0	0	$ 14,625
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross		3,554	3,554
Computer and test equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		162,388	148,995
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		3,460	3,880
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		14,865	14,366
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
China
Property, Plant and Equipment [Line Items]
Property and equipment, net		10,617	$ 14,998
Held-for-sale | China | Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, net		$ 2,200