Consolidated Statements Of Comprehensive Earnings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Consolidated Statements Of Comprehensive Earnings [Abstract]
Net earnings	$ 1,491,966	$ 1,338,147	$ 1,161,442
Other comprehensive (losses) earnings:
Unrealized gain on available-for-sale (AFS) securities, net of tax effect of $6,324, $8,251 and $33,777 in 2011, 2010 and 2009, respectively	10,041	13,102	53,637
Reclassification adjustment for net realized (gain) loss on AFS securities, net of tax effect of ($7,684), ($9,473) and $2,628 in 2011, 2010 and 2009, respectively	(12,202)	(15,043)	4,173
Adjustment to postretirement benefit plan obligation, net of tax effect of ($3,655), ($1,913) and ($1,246) in 2011, 2010 and 2009, respectively	(5,804)	(3,038)	(1,979)
Comprehensive earnings	$ 1,484,001	$ 1,333,168	$ 1,217,273