Segment Reporting (Reconciliation Of Restaurant-Level EBITDA To Operating Income) (Details) - USD ($) $ in Thousands	3 Months Ended		8 Months Ended
	Sep. 08, 2015	Sep. 09, 2014	Sep. 08, 2015	Sep. 09, 2014
Segment Reporting [Abstract]
Restaurant-level EBITDA	$ 12,338	$ 11,800	$ 45,954	$ 42,248
Less: Pre-opening costs	2,044	1,577	3,790	2,867
Less: General and administrative	5,225	4,673	16,611	14,202
Less: Public offering costs				5
Less: Non-cash impairment charges	3,338		3,338
Less: Depreciation and amortization	3,811	3,098	11,001	9,053
Operating income (loss)	$ (2,080)	$ 2,452	$ 11,214	$ 16,121