Acquisition Table of 2014 Acquisitions (Details) (USD $)	3 Months Ended				6 Months Ended	12 Months Ended
	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 28, 2014	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Business Acquisition [Line Items]
Restaurants Acquired	94	25	4		119	123		278
Payments to Acquire Businesses, Net of Cash Acquired						$ 52,200,000	$ 0	$ 12,135,000
Proceeds from sale-leaseback transactions						19,565,000	3,144,000	1,177,000
Restaurants to be remodeled								455
Revenue of acquired restaurants since acquisition						34,000,000		174,300,000
Acquisition-related costs	1,200,000	400,000	200,000	100,000		1,900,000		1,200,000
April 30, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired						4
Payments to Acquire Businesses, Net of Cash Acquired						681,000
June 30, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired						4
Properties purchased for sale-leaseback, number						1
Payments to Acquire Businesses, Net of Cash Acquired						3,819,000
July 22, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired						21
Payments to Acquire Businesses, Net of Cash Acquired						8,609,000
October 8, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired						30
Properties purchased for sale-leaseback, number						12
Payments to Acquire Businesses, Net of Cash Acquired						20,330,000
November 4, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired						64
Payments to Acquire Businesses, Net of Cash Acquired						18,761,000
Restaurants to be remodeled						46
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions	10
Proceeds from sale-leaseback transactions	$ 12,961,000