Consolidated Statements Of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenues:
Revenue	$ 402,345,000	$ 296,917,000	$ 1,061,693,000	$ 871,553,000
Costs and expenses:
Cost of sales	121,283,000	82,082,000	313,015,000	237,004,000
Restaurant wages and related expenses	131,070,000	95,391,000	352,402,000	283,489,000
Restaurant rent expense	29,300,000	20,259,000	77,906,000	60,112,000
Other restaurant operating expenses	62,710,000	45,510,000	164,623,000	132,938,000
Advertising expense	16,052,000	12,120,000	42,601,000	35,741,000
General and administrative (including stock-based compensation expense of $1,707, $1,531, $4,515 and $4,501 respectively)	21,365,000	17,602,000	61,709,000	49,758,000
Depreciation and amortization	21,200,000	14,555,000	53,613,000	43,426,000
Impairment and other lease charges	500,000	164,000	1,777,000	3,354,000
Other income, net	(20,000)	(434,000)	(1,773,000)	(434,000)
Total operating expenses	403,460,000	287,249,000	1,065,873,000	845,388,000
Income (loss) from operations	(1,115,000)	9,668,000	(4,180,000)	26,165,000
Loss on extinguishment of debt	0	0	7,443,000	0
Interest expense	7,578,000	5,909,000	20,425,000	17,752,000
Gain on bargain purchase	0	0	0	(230,000)
Income (loss) before income taxes	(8,693,000)	3,759,000	(32,048,000)	8,643,000
Provision (benefit) for income taxes	(1,881,000)	148,000.0	(10,035,000)	346,000
Net income (loss)	$ (6,812,000)	$ 3,611,000	$ (22,013,000)	$ 8,297,000
Basic and diluted net income (loss) per share	$ (0.15)	$ 0.08	$ (0.54)	$ 0.18
Weighted average common shares outstanding:
Basic	45,947,413	35,735,680	41,014,635	35,707,245
Diluted	45,947,413	45,410,556	41,014,635	45,293,255
Other comprehensive income (loss), net of tax:
Net income (loss)	$ (6,812,000)	$ 3,611,000	$ (22,013,000)	$ 8,297,000
Other comprehensive income	0	0	0	0
Comprehensive income (loss)	(6,812,000)	3,611,000	(22,013,000)	8,297,000
Restaurant sales [Member]
Revenues:
Revenue	398,414,000	296,917,000	1,054,877,000	871,553,000
Other revenue [Member]
Revenues:
Revenue	$ 3,931,000	$ 0	$ 6,816,000	$ 0