Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 29, 2016	Dec. 29, 2015
Components of accrued liabilities
Payroll and vacation	$ 19,957	$ 19,279
Sales tax payable	5,606	5,648
Deferred vendor rebates	5,436	890
Other	19,143	19,030
Total Accrued liabilities	$ 50,142	$ 44,847