Income Taxes - Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Income Taxes
Balance at the beginning of the period	$ 2,813,000	$ 2,661,000
Additions for tax positions of current year	344,000
Additions for tax positions of prior years	1,303,000	1,167,000
Reductions for lapse of statute of limitations	(775,000)	(1,015,000)
Balance at the end of the period	3,685,000	2,813,000
Interest benefits included in income tax expense	(141,000)	(35,000)
Income tax expense, accrued interest and penalties	$ 536,000	$ 674,000