Discontinued Operations (Statement of Operations Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Discontinued Operations and Disposal Groups [Abstract]
Net sales									$ 178,850	$ 187,725	$ 228,178
Cost of sales									154,570	162,448	192,237
Selling, general and administrative expenses									20,630	20,826	22,278
Amortization of intangible assets									2,062	2,597	2,482
Restructuring and other charges									390	932	514
Impairment of goodwill									9,857	0	0
Impairment of intangible assets									0	0	8,874
Interest expense, net									117	137	99
Other income, net									(954)	(6,563)	(3,141)
(Loss) income from discontinued operations before income taxes									(7,822)	7,348	4,835
(Loss) gain on sale of discontinued operations before income taxes									(4,987)	2,519	25,597
(Loss) income from discontinued operations before income taxes									(12,809)	9,867	30,432
Income tax (benefit) expense on discontinued operations									(1,419)	(1,323)	12,942
(Loss) income from discontinued operations, net of taxes	$ (13,159)	$ 319	$ 950	$ 500	$ 4,899	$ 3,137	$ 1,305	$ 1,849	$ (11,390)	$ 11,190	$ 17,490
Discontinued operations per share - basic	$ (0.20)	$ 0.00	$ 0.01	$ 0.01	$ 0.07	$ 0.05	$ 0.02	$ 0.03	$ (0.16)	$ 0.17	$ 0.27
Discontinued operations per share - diluted	$ (0.20)	$ 0.00	$ 0.01	$ 0.01	$ 0.07	$ 0.05	$ 0.02	$ 0.03	$ (0.16)	$ 0.17	$ 0.27