Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 27, 2016	Dec. 29, 2015
Components of accrued liabilities
Payroll and vacation	$ 20,427	$ 19,279
Sales tax payable	5,516	5,648
Other	23,069	19,920
Total Accrued liabilities	$ 49,012	$ 44,847