Acquisitions (Details) $ in Thousands	9 Months Ended
	Sep. 27, 2015 USD ($) stores	Sep. 28, 2014 USD ($) stores	Dec. 28, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 775,633		$ 822,562
Acquisitions [Member]
Business Acquisition [Line Items]
Restaurants acquired from franchisees | stores	4	6
Properties	$ 1,303	$ 3,870
Acquired franchise rights	760	2,000
Goodwill	127	720
Deferred taxes and other assets	(40)	46
Capital leases obligations	(438)	0
Unfavorable leases	(440)	0
Deferred taxes and other liabilities	(40)	(338)
Gain on acquisition of restaurants	0	(349)
Total consideration paid, net of cash received	$ 1,232	$ 5,949