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Consolidated Statements Of Comprehensive Earnings (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Consolidated Statements Of Comprehensive Earnings [Abstract]
Unrealized gain on available-for-sale (AFS) securities, tax effect	$ 6,324	$ 8,251	$ 33,777
Reclassification adjustment for net realized (gain) loss on AFS securities, tax effect	(7,684)	(9,473)	2,628
Adjustment to postretirement benefit plan obligation, tax effect	$ (3,655)	$ (1,913)	$ (1,246)

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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