Discontinued Operations (Statement of Operations Information) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Discontinued Operations and Disposal Groups [Abstract]
Net sales									$ 0	$ 34,891,000	$ 68,478,000
Income from discontinued operations before income taxes									(63,000)	4,471,000	11,342,000
Income tax expense on discontinued operations									0	2,663,000	4,441,000
Gain (loss) on sale of discontinued operations, net of tax									2,519,000	14,933,000	(6,260,000)
Income from discontinued operations, net of taxes	938,000	(99,000)	664,000	953,000	1,791,000	13,492,000	113,000	1,345,000	2,456,000	16,741,000	641,000
Discontinued operations per share - basic	$ 0.02	$ 0.00	$ 0.01	$ 0.01	$ 0.03	$ 0.21	$ 0.00	$ 0.02	$ 0.04	$ 0.25	$ 0.01
Discontinued operations per share - diluted	$ 0.02	$ 0.00	$ 0.01	$ 0.01	$ 0.03	$ 0.16	$ 0.00	$ 0.02	$ 0.04	$ 0.25	$ 0.01
Discontinued operations, decrease in liabilities											1,800,000
Discontinued operations, decrease in liabilities, tax effect											1,200,000
Tax expense (benefit) on income (loss) from discontinued operations									$ 0	$ 10,700,000	$ (2,600,000)