Income taxes (Tables)

9 Months Ended

Sep. 24, 2013

Income taxes

Schedule of reconciliation of the statutory federal income tax rate to the entity's effective tax rate

	13 Weeks Ended				39 Weeks Ended
	September 24, 2013		September 25, 2012		September 24, 2013		September 25, 2012
Tax at statutory federal rate	35.0	%	35.0	%	35.0	%	35.0	%
State and local tax, net of federal benefit	3.7		3.8		3.7		3.8
FICA tip tax credit	(7.5	)	(6.4	)	(6.3	)	(5.8	)
Work opportunity tax credit	(1.1	)	(0.9	)	(2.2	)	(0.8	)
Incentive stock options	(1.2	)	(0.2	)	(0.8	)	(0.3	)
Nondeductible officer compensation	0.5		1.4		0.4		1.1
Other	1.0		—		(0.2	)	(0.3	)
Total	30.4	%	32.7	%	29.6	%	32.7	%