Acquisition (Details) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended		15 Months Ended
	Apr. 03, 2016 USD ($) $ / shares	Mar. 29, 2015 USD ($) $ / shares	Jan. 01, 2017	Jan. 03, 2016 USD ($)	Apr. 03, 2016 USD ($)
Business Acquisition [Line Items]
Number of Restaurants Acquired					67
Acquisition of restaurants, net of cash acquired	$ 7,127	$ 0			$ 59,877
Business Acquisition, Properties purchased, number				10	16
Proceeds from sale-leaseback transactions	5,015	1,808
Restaurant sales	222,519	193,170
Business Acquisition, Pro Forma Revenue	224,674	213,150
Business Acquisition, Pro Forma Net Income (Loss)	$ 2,621	$ (8,155)
Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted | $ / shares	$ 0.06	$ (0.23)
March 31, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				4
Business Acquisition, Effective Date of Acquisition				Mar. 31, 2015
Acquisition of restaurants, net of cash acquired				$ 794
August 4, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				5
Business Acquisition, Effective Date of Acquisition				Aug. 04, 2015
Acquisition of restaurants, net of cash acquired				$ 663
October 1, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				5
Business Acquisition, Effective Date of Acquisition				Oct. 01, 2015
Acquisition of restaurants, net of cash acquired				$ 5,044
Business Acquisition, Properties purchased, number				1
October 20, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				1
Business Acquisition, Effective Date of Acquisition				Oct. 20, 2015
Acquisition of restaurants, net of cash acquired				$ 709
November 17, 2015 Acquisition 1 [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				2
Business Acquisition, Effective Date of Acquisition				Nov. 17, 2015
Acquisition of restaurants, net of cash acquired				$ 618
November 17, 2015 Acquisition 2 [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				6
Business Acquisition, Effective Date of Acquisition				Nov. 17, 2015
Acquisition of restaurants, net of cash acquired				$ 10,945
Business Acquisition, Properties purchased, number				5
December 1, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				23
Business Acquisition, Effective Date of Acquisition				Dec. 01, 2015
Acquisition of restaurants, net of cash acquired				$ 26,175
December 8, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				9
Business Acquisition, Effective Date of Acquisition				Dec. 08, 2015
Acquisition of restaurants, net of cash acquired				$ 7,802
February 23, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired	12
Business Acquisition, Effective Date of Acquisition	Feb. 23, 2016
Acquisition of restaurants, net of cash acquired	$ 7,127
Acquired Restaurants [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions	3			3
Proceeds from sale-leaseback transactions	$ 5,000			$ 4,300
Restaurant sales	$ 18,700
Subsequent Event [Member] | Acquired Restaurants [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions			9