Income Taxes (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 27, 2018	Dec. 28, 2017	Dec. 27, 2018	Dec. 28, 2017	Dec. 29, 2016
Income Taxes [Line Items]
Effective Income Tax Rate			19.70%	5.30%	37.80%
Proceeds from Income Tax Refunds			$ 218,000
Income Taxes Paid, Net				$ 23,691,000	$ 25,017,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 67,000		67,000	67,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		54,000		54,000
Income Tax Examination, Interest Expense				$ 50,000	$ 153,000
Effective Income Tax Rate Reconciliation, Percent			22.70%	36.20%
Income Tax Credits and Adjustments	$ 1,947,000	$ 21,240,000
Description of Impact of the Tax Cuts and Jobs Act of 2017				Reduction in the corporate tax rate and the provisions related to executive compensation and 100% bonus depreciation on qualifying property
Income Tax Examination, Interest Income			$ 68,000