Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Financial Instruments (Thousands of Dollars) [Abstract]

Schedule of Long-term Debt Instruments

	March 31, 2019				April 1, 2018				December 30, 2018
	Carrying		Fair		Carrying		Fair		Carrying		Fair
	Cost		Value		Cost		Value		Cost		Value
6.35% Notes Due 2040	$	500,000		548,200		500,000		585,400		500,000		535,000
3.50% Notes Due 2027		500,000		479,450		500,000		468,000		500,000		457,350
5.10% Notes Due 2044		300,000		285,990		300,000		299,460		300,000		272,640
3.15% Notes Due 2021		300,000		301,440		300,000		300,480		300,000		297,600
6.60% Debentures Due 2028		109,895		129,445		109,895		128,006		109,895		123,346
Total long-term debt	$	1,709,895		1,744,525		1,709,895		1,781,346		1,709,895		1,685,936
Less: Deferred debt expenses		14,433		-		15,918		-		14,803		-
Long-term debt	$	1,695,462		1,744,525		1,693,977		1,781,346		1,695,092		1,685,936