Income Taxes (Details 2)	12 Months Ended
	Dec. 27, 2018	Dec. 28, 2017	Dec. 29, 2016
Effective Income Tax Rate Reconciliation, Percent
Statutory federal tax rate	21.00%	35.00%	35.00%
Tax benefit from Tax Cuts and Jobs Act of 2017	(2.90%)	(30.90%)	0.00%
State income taxes, net of federal income tax benefit	6.10%	4.80%	4.80%
Tax credits, net of federal income tax benefit	(1.10%)	(0.80%)	(0.90%)
Other	(3.40%)	(2.80%)	(1.10%)
Reconciliation, Total	19.70%	5.30%	37.80%