Consolidated Statements Of Comprehensive Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 28, 2021	Jun. 28, 2020	Jun. 28, 2021	Jun. 28, 2020
Revenues:
Revenue	$ 424,541,000	$ 368,418,000	$ 814,534,000	$ 719,936,000
Costs and expenses:
Food, beverage and packaging costs	126,424,000	104,703,000	240,214,000	207,630,000
Restaurant wages and related expenses	137,592,000	111,888,000	267,238,000	236,463,000
Restaurant rent expense	30,591,000	28,984,000	60,905,000	58,438,000
Other restaurant operating expenses	65,128,000	54,310,000	126,547,000	112,288,000
Advertising expense	16,939,000	14,416,000	32,308,000	28,292,000
General and administrative expenses (including stock-based compensation of $1,614, $1,109, $3,083 and $2,241 respectively)	20,698,000	18,581,000	42,067,000	39,368,000
Depreciation and amortization	20,421,000	20,296,000	41,030,000	41,327,000
Impairment and other lease charges	144,000	2,941,000	497,000	5,822,000
Other expense (income), net		(2,003,000)
Total operating expenses	418,652,000	354,116,000	811,748,000	727,681,000
Income (loss) from operations	5,889,000	14,302,000	2,786,000	(7,745,000)
Interest expense	6,942,000	6,370,000	13,668,000	13,510,000
Income (loss) before income taxes	(9,591,000)	7,932,000	(19,420,000)	(21,255,000)
Provision (benefit) for income taxes	(32,000)	90,000	(2,693,000)	(6,888,000)
Net income (loss)	$ (9,559,000)	$ 7,842,000	$ (16,727,000)	$ (14,367,000)
Basic and diluted net income (loss) per share	$ (0.19)	$ 0.13	$ (0.34)	$ (0.28)
Weighted average common shares outstanding:
Weighted average common shares outstanding (in shares)	49,917,296	50,916,758	49,870,718	50,868,929
Shares used in computing diluted net income (loss) per share (in shares)	49,917,296	60,331,817	49,870,718	50,868,929
Other comprehensive income (loss), net of tax:
Net income (loss)	$ (9,559,000)	$ 7,842,000	$ (16,727,000)	$ (14,367,000)
Change in valuation of interest rate swap (Notes 5 and 7)	(504,000)	(2,178,000)	2,655,000	(7,387,000)
Comprehensive income (loss)	(10,063,000)	5,664,000	(14,072,000)	(21,754,000)
Gain (Loss) on Extinguishment of Debt	8,538,000	0	8,538,000	0
Stock-based compensation	$ 1,614,000	$ 1,109,000	$ 3,083,000	$ 2,241,000