Acquisitions (Details) $ in Thousands	6 Months Ended
	Jun. 28, 2015 USD ($) stores	Jun. 29, 2014 USD ($) stores	Dec. 28, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 795,737		$ 822,562
Acquisitions [Member]
Business Acquisition [Line Items]
Restaurants acquired from franchisees | stores	4	3
Properties	$ 1,303	$ 1,791
Acquired franchise rights	760	1,200
Goodwill	395	0
Deferred taxes and other assets	(40)	23
Capital leases obligations	(706)	0
Unfavorable leases	(440)	0
Other liabilities	(40)	(63)
Gain on acquisition of restaurants	0	(616)
Total consideration paid, net of cash received	$ 1,232	$ 2,335