Consolidated Statements Of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Revenues:
Revenue	$ 421,703,000	$ 407,036,000	$ 1,236,237,000	$ 1,126,972,000
Costs and expenses:
Food, beverage and packaging costs	131,103,000	121,228,000	371,317,000	328,858,000
Restaurant wages and related expenses	141,303,000	126,040,000	408,541,000	362,503,000
Restaurant rent expense	30,551,000	30,536,000	91,456,000	88,974,000
Other restaurant operating expenses	66,733,000	60,486,000	193,280,000	172,774,000
Advertising expense	16,619,000	15,989,000	48,927,000	44,281,000
General and administrative expenses (including stock-based compensation of $1,458, $1,303, $4,541 and $3,543, respectively)	19,209,000	20,440,000	61,276,000	59,808,000
Depreciation and amortization	20,101,000	19,620,000	61,131,000	60,947,000
Impairment and other lease charges	784,000	1,954,000	1,281,000	7,776,000
Other expense (income), net		515,000
Total operating expenses	425,350,000	396,808,000	1,237,098,000	1,124,489,000
Income (loss) from operations	(3,647,000)	10,228,000	(861,000)	2,483,000
Gain (Loss) on Extinguishment of Debt	0	0	8,538,000	0
Interest expense	7,724,000	6,649,000	21,392,000	20,159,000
Income (loss) before income taxes	(11,371,000)	3,579,000	(30,791,000)	(17,676,000)
Provision (benefit) for income taxes	(1,469,000)	48,000	(4,162,000)	(6,840,000)
Net income (loss)	$ (9,902,000)	$ 3,531,000	$ (26,629,000)	$ (10,836,000)
Basic and diluted net income (loss) per share	$ (0.20)	$ 0.06	$ (0.53)	$ (0.21)
Weighted average common shares outstanding:
Weighted average common shares outstanding (in shares)	49,927,583	50,923,686	49,889,673	50,887,182
Shares used in computing diluted net income (loss) per share (in shares)	49,927,583	60,542,580	49,889,673	50,887,182
Other comprehensive income (loss), net of tax:
Net income (loss)	$ (9,902,000)	$ 3,531,000	$ (26,629,000)	$ (10,836,000)
Change in valuation of interest rate swap (Notes 5 and 7)	269,000	169,000	2,924,000	(7,218,000)
Comprehensive income (loss)	$ (9,633,000)	$ 3,700,000	$ (23,705,000)	$ (18,054,000)