Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 29, 2015	Dec. 30, 2014
Components of accrued liabilities
Payroll and vacation	$ 19,919	$ 16,535
Accrued real estate and property taxes	7,119	5,528
Sales tax payable	4,963	4,978
Other	19,669	16,356
Total Accrued liabilities	$ 51,670	$ 43,397