CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Statement of Comprehensive Income [Abstract]
Net earnings	$ 493,706	$ 471,253
Other comprehensive earnings:
Unrealized gain on available-for-sale (AFS) securities, net of tax effect	11,913	33,695
Reclassification adjustment for net realized gain on AFS securities, net of tax effect	(3,437)	(1,632)
Adjustment to postretirement benefit plan obligation, net of tax effect	84	806
Comprehensive earnings	$ 502,266	$ 504,122