Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 27, 2017	Dec. 27, 2018	Dec. 28, 2017	Dec. 29, 2016
Accounting Policies [Abstract]
Short-term investments, included as cash and cash equivalents	$ 400	$ 1,900
Discounted insurance liabilities	$ 17,000	$ 16,900
Self insurance liabilities, discount rate	2.50%	2.00%
Undiscounted insurance liabilities	$ 18,200	$ 18,100
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment				$ (15,446)	$ 9,139
(Deficit) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment				$ 100
Estimated Forfeitures [Member] | (Deficit) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					(400)
Estimated Forfeitures [Member] | Other Noncurrent Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					(200)
Estimated Forfeitures [Member] | Additional Paid-in Capital [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					600
Excess Tax Benefits [Member] | (Deficit) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					$ 9,000
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities			$ 100,000
Operating lease ROU assets			91,000
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities			105,000
Operating lease ROU assets			$ 96,000