Acquisition (Details) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended	18 Months Ended
	Jul. 02, 2017 USD ($)	Jan. 01, 2017 USD ($)	Oct. 02, 2016 USD ($)	Jul. 03, 2016 USD ($)	Jul. 02, 2017 USD ($)	Jul. 03, 2016 USD ($)	Jan. 01, 2017 USD ($)	Jul. 02, 2017 USD ($)
Business Acquisition [Line Items]
Right of First Refusal, Number of States	20				20			20
Number of Restaurants Acquired							56	116
Business acquisitions, purchase price					$ 36,563	$ 19,207	$ 48,088	$ 84,651
Business acquisitions, properties purchased							15	15
Proceeds from sale-leaseback transactions					2,717	17,687
Restaurant sales	$ 279,478			$ 241,368	519,330	463,887
February 23, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				12
Business acquisitions, purchase price				$ 7,127
May 25, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				6
Business acquisitions, purchase price				$ 12,080
Business acquisitions, properties purchased				5
July 14, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				4
Business acquisitions, purchase price				$ 5,445
Business acquisitions, properties purchased				3
August 23, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired			7
Business acquisitions, purchase price			$ 8,755
Business acquisitions, properties purchased			6
October 4, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired		3
Business acquisitions, purchase price		$ 1,623
November 15, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired		17
Business acquisitions, purchase price		$ 7,251
December 1, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired		7
Business acquisitions, purchase price		$ 5,807
Business acquisitions, properties purchased		1
February 28, 2017 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired	43
Business acquisitions, purchase price	$ 20,373
June 6, 2017 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				17
Business acquisitions, purchase price				$ 16,190
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions							14
Proceeds from sale-leaseback transactions							$ 19,100
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Tax deductible goodwill	6,500				6,500			$ 6,500
Acquired Restaurants [Member]
Business Acquisition [Line Items]
Restaurant sales	$ 34,400			$ 5,100	$ 55,100	$ 7,000