Facilities and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2016	Dec. 29, 2015	Dec. 30, 2014
Property, Plant and Equipment [Line Items]
Facilities and equipment, gross	$ 430,755	$ 367,461
Less accumulated depreciation	(201,208)	(163,993)
Net facilities and equipment	229,547	203,468
Depreciation expense	52,600	46,300	$ 48,100
Land
Property, Plant and Equipment [Line Items]
Facilities and equipment, gross	8,015	6,504
Buildings and leasehold/land improvements
Property, Plant and Equipment [Line Items]
Facilities and equipment, gross	$ 175,574	147,250
Buildings and leasehold/land improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated depreciable life	5 years
Buildings and leasehold/land improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated depreciable life	40 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Facilities and equipment, gross	$ 238,054	205,985
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated depreciable life	3 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated depreciable life	10 years
Construction in progress
Property, Plant and Equipment [Line Items]
Facilities and equipment, gross	$ 9,112	$ 7,722