Discontinued Operations (Statement of Operations Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Jan. 02, 2016
Discontinued Operations and Disposal Groups [Abstract]
Net sales									$ 6,637	$ 178,850
Cost of sales									6,625	154,570
Selling, general and administrative expenses									2,242	20,630
Amortization of intangible assets									0	2,062
Restructuring and other charges									0	390
Impairment of goodwill									0	9,857
Interest expense, net									7	117
Other expense (income), net									729	(954)
Loss from discontinued operations									(2,966)	(7,822)
Gain (loss) on sale of discontinued operations									1,405	(4,987)
Loss from discontinued operations									(1,561)	(12,809)
Income tax expense (benefit) on discontinued operations									1,336	(1,419)
Loss from discontinued operations, net of taxes	$ 1,538	$ 686	$ (3,304)	$ (1,817)	$ (13,159)	$ 319	$ 950	$ 500	$ (2,897)	$ (11,390)
Discontinued operations per share - basic	$ 0.18	$ 0.08	$ (0.39)	$ (0.21)	$ (1.56)	$ 0.04	$ 0.11	$ 0.06	$ (0.34)	$ (1.34)
Discontinued operations per share - diluted	$ 0.18	$ 0.08	$ (0.33)	$ (0.17)	$ (1.56)	$ 0.04	$ 0.11	$ 0.06	$ (0.31)	$ (1.34)