Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 82,511	$ 75,584	$ 68,291
Other comprehensive income by component, net of tax:
Unrealized holding (losses) gains arising during period (Net of deferred taxes of $0, $923 and $288, respectively)	(9)	1,391	405
Reclassification adjustment for gains included in net income (Net of deferred taxes of $293, $601 and $93, respectively)	(420)	(846)	(130)
Other comprehensive income, net of tax	(429)	545	275
Comprehensive income, net of tax	$ 82,082	$ 76,129	$ 68,566