Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Property and equipment [Line Items]
Land	$ 8,659	$ 8,112
Owned buildings	9,950	9,174
Leasehold improvements	301,091	265,008
Equipment	227,284	203,412
Assets subject to capital leases	16,874	16,948
Propert and equipment, gross	563,858	502,654
Less accumulated depreciation and amortization	(289,760)	(254,807)
Property and equipment, net	274,098	247,847
Capital leases, accumulated depreciation	12,245	11,008
Depreciation expense	54,159	47,295	$ 39,845
Property and Equipment [Member]
Property and equipment [Line Items]
Depreciation expense	$ 45,700	$ 39,918	$ 33,878