Stockholders' Equity And Comprehensive Income (Stockholders' Equity And Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Stockholders' equity, beginning of period			$ 7,330,694	$ 7,584,289
Net earnings	200,111	50,024	702,811	197,436
Net unrealized loss on hedging derivatives, net of income taxes	(4,531)	(6,702)	(7,230)	(29,967)
Reclassification adjustment for loss on settlement of hedging derivatives included in net income, net of income taxes	9,023	9,420	27,282	25,619
Foreign currency translation gain (loss)	(86,521)	58,273	(13,878)	8,055
Total comprehensive income	118,082	111,015	708,985	201,143
Stock options			16,224	4,040
Issuance of stock under award plans, net of forfeitures			24,117	24,889
Amortization of unearned compensation			1,300	1,800
Dividends declared			(346,284)	(343,089)
Distributions to noncontrolling interests			(55,855)	(42,723)
Stockholders' equity, end of period	7,679,181	7,430,349	7,679,181	7,430,349
Noncontrolling Interests [Member]
Stockholders' equity, beginning of period			210,624	193,763
Net earnings			61,679	51,985
Foreign currency translation gain (loss)			(3)	7
Total comprehensive income			61,676	51,992
Distributions to noncontrolling interests			(55,855)	(42,723)
Stockholders' equity, end of period	216,445	203,032	216,445	203,032
Nucor-Yamato Steel Company [Member]
Noncontrolling interest, ownership percentage by parent	51.00%		51.00%
Nucor Trading S.A. [Member]
Noncontrolling interest, ownership percentage by parent	75.00%		75.00%
Barker Steel Company, Inc. [Member]
Noncontrolling interest, ownership percentage by parent	90.00%		90.00%
Nucor [Member]
Stockholders' equity, beginning of period			7,120,070	7,390,526
Net earnings			641,132	145,451
Net unrealized loss on hedging derivatives, net of income taxes			(7,230)	(29,967)
Reclassification adjustment for loss on settlement of hedging derivatives included in net income, net of income taxes			27,282	25,619
Foreign currency translation gain (loss)			(13,875)	8,048
Total comprehensive income			647,309	149,151
Stock options			16,224	4,040
Issuance of stock under award plans, net of forfeitures			24,117	24,889
Amortization of unearned compensation			1,300	1,800
Dividends declared			(346,284)	(343,089)
Stockholders' equity, end of period	$ 7,462,736	$ 7,227,317	$ 7,462,736	$ 7,227,317

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