Financial Instruments (Tables)

6 Months Ended

Jun. 26, 2011

Financial Instruments (Thousands of Dollars) [Abstract]

Schedule of long-term debt instruments

	June 26, 2011		June 27, 2010		Dec. 26, 2010
	--------------------		--------------------		---------------------------
	Carrying Cost	Fair Value	Carrying Cost	Fair Value	Carrying Cost	Fair Value
	-------	------	-------	------	-------	------
6.125% Notes Due 2014	$   443,136	469,625	437,085	451,606	437,786	462,698
6.30% Notes Due 2017	350,000	399,420	350,000	365,773	350,000	382,830
6.60% Debentures    Due 2028	109,895	115,675	109,895	109,002	109,895	110,038
6.35% Notes Due 2040	500,000	523,650	500,000	507,887	500,000	499,900
	-------------	-----------	-------------	-----------	-------------	-----------
Total long-term debt	$1,403,031	1,508,370	1,396,980	1,434,268	1,397,681	1,455,466
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