Consolidated Statements of Comprehensive Earnings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,653,954	$ 1,552,255	$ 1,491,966
Other comprehensive earnings:
Unrealized gain on available-for-sale (AFS) securities, net of tax effect of $41,474, $12,567 and $6,324 in 2013, 2012 and 2011, respectively	65,861	19,956	10,041
Reclassification adjustment for net realized gain on AFS securities, net of tax effect of ($18,458), ($4,013) and ($7,684) in 2013, 2012 and 2011, respectively	(29,311)	(6,373)	(12,202)
Adjustment to postretirement benefit plan obligation, net of tax effect of $7,658, ($3,498) and ($3,655) in 2013, 2012 and 2011, respectively	12,160	(5,555)	(5,804)
Comprehensive earnings	$ 1,702,664	$ 1,560,283	$ 1,484,001