Financial Instruments (Tables)

3 Months Ended

Mar. 27, 2016

Financial Instruments (Thousands of Dollars) [Abstract]

Schedule of Long-term Debt Instruments

	March 27, 2016				March 29, 2015				December 27, 2015
	Carrying		Fair		Carrying		Fair		Carrying		Fair
	Cost		Value		Cost		Value		Cost		Value
6.35% Notes Due 2040	$	500,000		560,900		500,000		597,900		500,000		556,300
6.30% Notes Due 2017		350,000		370,965		350,000		389,305		350,000		374,045
5.10% Notes Due 2044		300,000		287,610		300,000		316,260		300,000		286,710
3.15% Notes Due 2021		300,000		302,880		300,000		308,970		300,000		300,060
6.60% Debentures Due 2028		109,895		122,456		109,895		131,039		109,895		121,269
Total long-term debt	$	1,559,895		1,644,811		1,559,895		1,743,474		1,559,895		1,638,384
Less: Deferred debt expenses		12,461		-		13,726		-		12,780		-
Long-term debt		1,547,434		1,644,811		1,546,169		1,743,474		1,547,115		1,638,384