Leases - Capital Leases Included in Company's Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Leases [Abstract]
Leased property under capital leases (included in property and equipment)	$ 10,097	$ 10,081
Accumulated depreciation	(4,442)	(4,055)
Net leased property under capital leases	5,655	6,026
Current	596	589
Long-term	7,180	7,550
Total capital lease obligations	$ 7,776	$ 8,139