Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Revenue and Expenses
Pretax income from discontinued operations	$ 0	$ 1,030
Significant Noncash Items
Capital expenditures	0	311
SISD | Discontinued Operations, Disposed of by Sale
Revenue and Expenses
Revenue	0	12,061
Cost of revenue	0	(5,610)
Research, development, and engineering expenses	0	(1,090)
Selling, general, and administrative expenses	0	(3,554)
Foreign currency gain (loss)	0	(254)
Pretax income from discontinued operations	0	1,553
Income tax expense	0	523
Discontinued operations, net of tax	0	1,030
Significant Noncash Items
Capital expenditures	0	311
Stock-based compensation expense	0	283
Depreciation expense	0	198
Amortization expense	$ 0	$ 83