Financial Instruments (Tables)

9 Months Ended

Sep. 25, 2011

Financial Instruments (Thousands of Dollars) [Abstract]

Schedule of long-term debt instruments

	Sept. 25, 2011		Sept. 26, 2010		Dec. 26, 2010
	--------------------		--------------------		----------------------------
	Carrying Cost	Fair Value	Carrying Cost	Fair Value	Carrying Cost	Fair Value
	-------	------	-------	------	-------	------
6.125% Notes Due 2014	$   445,176	467,245	444,661	466,225	437,786	462,698
6.30% Notes Due 2017	350,000	402,780	350,000	388,290	350,000	382,830
6.60% Debentures Due 2028	109,895	120,775	109,895	114,148	109,895	110,038
6.35% Notes Due 2040	500,000	547,200	500,000	511,000	500,000	499,900
	-------------	-----------	-------------	-----------	------------	-----------
Total long-term debt	$1,405,071	1,538,000	1,404,556	1,479,663	1,397,681	1,455,466
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