Schedule Of Provisions For Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Income Tax Disclosure [Line Items]
Federal, Current									$ 65,307	$ 53,413	$ 46,164
State, Current									2,387	3,247	2,199
Canadian, Current									1,013	1,023	878
Total current									68,707	57,683	49,241
Federal, Deferred									4,117	9,056	801
State, Deferred									144	449	(276)
Total deferred									4,261	9,505	525
Income taxes	$ 14,765	$ 20,460	$ 22,164	$ 15,579	$ 17,546	$ 18,640	$ 18,295	$ 12,707	$ 72,968	$ 67,188	$ 49,766