Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 15, 2014	Jun. 16, 2013	Jun. 15, 2014	Jun. 16, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 38,462	$ 33,270	$ 78,936	$ 67,690
Other comprehensive income (loss), before tax:
Currency translation adjustment	241	(112)	(785)	(90)
Tax attributes of items in other comprehensive income (loss):
Currency translation adjustment	(31)	156	411	83
Other comprehensive income (loss), net of tax	210	44	(374)	(7)
Comprehensive income	$ 38,672	$ 33,314	$ 78,562	$ 67,683