Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 24, 2015	Mar. 25, 2014
Consolidated Statements Of Income And Comprehensive Income [Abstract]
Revenues	$ 75,102us-gaap_Revenues	$ 66,622us-gaap_Revenues
Costs and expenses:
Costs of sales	21,662us-gaap_CostOfRevenue	20,052us-gaap_CostOfRevenue
Restaurant operating expenses	34,947us-gaap_OperatingCostsAndExpenses	30,570us-gaap_OperatingCostsAndExpenses
Marketing and advertising costs	1,371us-gaap_MarketingAndAdvertisingExpense	1,221us-gaap_MarketingAndAdvertisingExpense
Pre-opening costs	267us-gaap_PreOpeningCosts	384us-gaap_PreOpeningCosts
General and administrative costs	5,478us-gaap_GeneralAndAdministrativeExpense	4,686us-gaap_GeneralAndAdministrativeExpense
Secondary public offering costs		5dfrg_CommonStockIssuanceCost
Depreciation and amortization	3,577us-gaap_DepreciationAndAmortization	2,955us-gaap_DepreciationAndAmortization
Operating income	7,800us-gaap_OperatingIncomeLoss	6,749us-gaap_OperatingIncomeLoss
Other income (expense), net:
Interest expense	(25)us-gaap_InterestExpense	(15)us-gaap_InterestExpense
Other	(89)us-gaap_OtherNonoperatingIncomeExpense	(17)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	7,686	6,717
Income tax expense	2,292us-gaap_IncomeTaxExpenseBenefit	2,195us-gaap_IncomeTaxExpenseBenefit
Net income	5,394us-gaap_NetIncomeLoss	4,522us-gaap_NetIncomeLoss
Basic income (loss) per common share:
Basic earnings per common share	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic
Diluted income (loss) per common share:
Diluted earnings per common share	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted
Shares used in computing earnings per common share:
Basic	23,443,046	23,627,386
Diluted	23,596,091	23,855,814
Comprehensive income	$ 5,394us-gaap_ComprehensiveIncomeNetOfTax	$ 4,522us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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