Financial Instruments (Tables)

6 Months Ended

Jun. 26, 2016

Financial Instruments (Thousands of Dollars) [Abstract]

Schedule of Long-term Debt Instruments

	June 26, 2016				June 28, 2015				December 27, 2015
	Carrying		Fair		Carrying		Fair		Carrying		Fair
	Cost		Value		Cost		Value		Cost		Value
6.35% Notes Due 2040	$	500,000		608,600		500,000		557,450		500,000		556,300
6.30% Notes Due 2017		350,000		370,125		350,000		382,235		350,000		374,045
5.10% Notes Due 2044		300,000		317,490		300,000		287,010		300,000		286,710
3.15% Notes Due 2021		300,000		308,640		300,000		301,800		300,000		300,060
6.60% Debentures Due 2028		109,895		133,006		109,895		121,115		109,895		121,269
Total long-term debt	$	1,559,895		1,737,861		1,559,895		1,649,610		1,559,895		1,638,384
Less: Deferred debt expenses		12,142		-		13,418		-		12,780		-
Long-term debt	$	1,547,753		1,737,861		1,546,477		1,649,610		1,547,115		1,638,384