Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2015	Dec. 31, 2014	Dec. 25, 2013
Cash flows from operating activities
Net income (loss)	$ 24,054	$ 42,463	$ (16,873)
Adjustments to reconcile changes in net income (loss) to net cash provided by operating activities:
Depreciation and amortization	13,092	11,538	10,213
Loss on early extinguishment of debt		9,718	21,530
Stock-based compensation expense	539	1,093	822
Interest accretion		290	3,753
Income tax receivable agreement expense	156	41,382
Gain on disposition of restaurants		(2,658)	(400)
Loss on disposal of assets	471	646	868
Impairment of property and equipment	181	293	27
Close-store reserves	(89)	740	(128)
Amortization of deferred financing costs	304	1,302	2,007
Amortization of favorable and unfavorable leases, net	(156)	(227)	(213)
Excess income tax benefit related to share-based compensation plans	(5,420)	(3,965)
Deferred income taxes, net	15,249	(67,001)	1,371
Changes in operating assets and liabilities:
Accounts and other receivables, net	(427)	147	(1,319)
Inventories	1	(245)	33
Prepaid expenses and other current assets	2,452	(3,065)	(123)
Income taxes receivable/payable	5,589	3,836	5
Other assets	91	247	95
Accounts payable	2,317	(8,023)	1,294
Accrued salaries and vacation	(1,311)	(651)	595
Accrued insurance	1,203	221	444
Other accrued expenses and liabilities	(325)	(1,996)	(4,301)
Net cash provided by operating activities	57,971	26,085	19,700
Cash flows from investing activities
Proceeds from disposition of assets		5,435	35
Purchase of property and equipment	(30,835)	(26,836)	(13,822)
Net cash flows used in investing activities	(30,835)	(21,401)	(13,787)
Cash flows from financing activities
Proceeds from borrowings on revolver and term loans		165,000	288,050
Revolver loan payments	(42,000)
Proceeds from issuance of common stock for initial public offering, net of expenses		112,300
Proceeds from issuance of common stock upon exercise of stock options	4,254	2,070
Payment of call premium on notes		(1,526)	(7,913)
Payment of obligations under capital leases	(208)	(268)	(229)
Repayments on senior secured notes		(290,000)	(282,196)
Deferred financing costs for Revolver		(1,526)	(8,097)
Excess income tax benefit related to share-based compensation plans	5,420	3,965
Amendment fee		(215)
Net cash flows used in financing activities	(32,534)	(10,200)	(10,385)
Decrease in cash and cash equivalents	(5,398)	(5,516)	(4,472)
Cash and cash equivalents, beginning of year	11,499	17,015	21,487
Cash and cash equivalents, end of year	6,101	11,499	17,015
Supplemental cash flow information
Cash paid for interest, net of capitalized interest	3,487	20,224	34,427
Cash paid during the year for income taxes, net	18	156	26
Noncash investing and financing activity
Unpaid purchase of property and equipment	3,201	1,235	$ 1,139
Cashless stock option exercise	$ 34	$ 27