The subsidiary's percentage of ownership of common stock or equity participation in a company.

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The equity method investments available credit facilities.

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The equity method investments available credit facilities subject to guarantee.

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Guarantor obligation percentage of exposure in case of default.

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Interest rate per year in excess of Euribor as of date of the note.

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Number of sheet processing facilities operated by equity investment.

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Period used for lag basis.

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Step-up to fair value of equity method investment, portion related to identification of goodwill.

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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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Date the credit facility terminates, in CCYY-MM-DD format.

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The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

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Date of maturity or expiration of arrangements with a related party (for example, but not limited to, leasing and debt arrangements between related parties), in CCYY-MM-DD format.

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Equity Investments - Additional Information (Detail) € in Millions		3 Months Ended		9 Months Ended
	Jul. 26, 2019 USD ($)	Sep. 28, 2019 USD ($)	Sep. 29, 2018 USD ($)	Sep. 28, 2019 USD ($) Sheet	Sep. 29, 2018 USD ($)	Sep. 28, 2019 EUR (€)	Jan. 16, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Schedule Of Equity Method Investments [Line Items]
Equity method investments		$ 826,100,000		$ 826,100,000				$ 869,900,000
Amortization				64,655,000	$ 66,684,000
NuMit LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investments		$ 323,900,000		$ 323,900,000				337,200,000
Equity method investment, ownership percentage		50.00%		50.00%		50.00%
Period used for lag basis, in months				1 month
Distributions from affiliates				$ 27,400,000	28,300,000
Steel Technologies LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		100.00%		100.00%		100.00%
Number of sheet processing facilities operated by Steel Technologies \| Sheet				26
Duferdofin Nucor S.r.l. [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investments		$ 256,000,000.0		$ 256,000,000.0				269,100,000
Equity method investment, ownership percentage		50.00%		50.00%		50.00%
Period used for lag basis, in months				1 month
Equity method investments, share of net assets		$ 107,000,000.0		$ 107,000,000.0
Basis difference due to the step-up to fair value of certain assets and liabilities		149,000,000.0		149,000,000.0
Step-up to fair value of equity method investment, portion related to identification of goodwill				84,300,000
Amortization		2,200,000	$ 2,300,000	6,700,000	$ 7,100,000
Due from related parties, noncurrent		38,300,000		$ 38,300,000		€ 35.0		40,200,000	€ 35.0
Interest rate per year in excess of Euribor as of date of the notes				0.75%
Equity method investments notes payable with parent company, maturity date				Jan. 31, 2022
Duferdofin Nucor S.r.l. [Member] \| Facility A [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investments credit facilities subject to guarantee, amount		175,100,000		$ 175,100,000		160.0
Total amount outstanding under equity method investments credit facilities		$ 168,500,000		$ 168,500,000		€ 154.0		178,000,000.0	€ 155.0
Guarantor obligation percentage of exposure in case of default		50.00%		50.00%		50.00%
Line of credit facility, maturity period				Apr. 16, 2021
Nucor-JFE [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investments		$ 150,100,000		$ 150,100,000				$ 135,700,000
Equity method investment, ownership percentage		50.00%		50.00%		50.00%	50.00%
Nucor-JFE [Member] \| General Financing Agreement and Promissory Note [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investments credit facilities subject to guarantee, amount							$ 65,000,000.0
Total amount outstanding under equity method investments credit facilities		$ 30,000,000.0		$ 30,000,000.0
Guarantor obligation percentage of exposure in case of default		50.00%		50.00%		50.00%
Nucor-JFE [Member] \| Uncommitted Loan Facility and Promissory Note [Member]
Schedule Of Equity Method Investments [Line Items]
Guarantee of debt	$ 17,500,000
Guarantee of debt, plus interest and fees	$ 20,000,000.0
Equity method investments credit facilities, maturity date	Jul. 31, 2024
Equity method investments credit facilities, amount	$ 35,000,000.0