Property and Equipment (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 176,250	$ 171,683
Accumulated depreciation and amortization		(141,367)	(131,260)
Property and equipment, net		34,883	40,423	$ 49,481
Depreciation expense		13,400	16,300	18,400
Proceeds from sale of building		0	7,895	0
Gain on sale of building		0	4,624	$ 0
Production equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross		160,979	155,492
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		12,648	13,277
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		2,623	$ 2,914
Buildings | Shanghai, China
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (1,400)
Property and equipment, net	3,600
Proceeds from sale of building	7,900
Direct selling costs	1,100
Gain on sale of building	$ 4,600
Restructuring
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 600