Impairment of Long-lived Assets - Assets Held for Sale (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Long Lived Assets Held-for-sale [Line Items]
Impairment of long-lived assets									$ 8,000	$ 1,219,000	$ 761,000
Gain on sale of property and equipment									1,009,000	10,000	(365,000)
Impairment of long-lived assets	$ 0	$ 0	$ 8,000	$ 0	$ 390,000	$ 86,000	$ 0	$ 743,000	$ 8,000	1,219,000	$ 761,000
Long-lived assets classified as held for sale					$ 0					0
Assets previously held for sale
Long Lived Assets Held-for-sale [Line Items]
Impairment of long-lived assets										200,000
Building
Long Lived Assets Held-for-sale [Line Items]
Impairment of long-lived assets										600,000
Gain on sale of property and equipment										200,000
Machinery & Equipment
Long Lived Assets Held-for-sale [Line Items]
Impairment of long-lived assets										500,000
Gain on sale of property and equipment										$ 52,000