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

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Total amount outstanding under equity method investments applicable credit facilities.

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The equity method investments available credit facilities subject to guarantee.

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Equity method investments principal amount subject to guarantee for other credit facilities.

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The expense associated with reserving a related party note receivable.

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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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity Investments - Additional Information (Detail) € in Millions	3 Months Ended		12 Months Ended
	Apr. 04, 2020 USD ($) Sheet	Mar. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Apr. 04, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Jan. 16, 2019
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 533,900,000		$ 793,200,000
Amortization	21,508,000	$ 21,500,000
NuMit LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 323,200,000		319,800,000
Equity method investment, ownership percentage	50.00%			50.00%
Period used for lag basis, in months	1 month
Distributions from affiliates	$ 2,000,000.0	26,000,000.0
Steel Technologies LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	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	$ 2,300,000		263,000,000.0
Equity method investment, ownership percentage	50.00%			50.00%
Period used for lag basis, in months	1 month
Equity method investments, share of net assets	$ 110,900,000
Equity method investments impairment charges	250,000,000.0
Basis difference due to the step-up to fair value of certain assets and liabilities	(108,600,000)
Step-up to fair value of equity method investment, portion related to identification of goodwill			86,500,000
Amortization	2,200,000	$ 2,200,000
Due from related parties, noncurrent	$ 37,800,000		39,300,000	€ 35.0	€ 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
Due from related parties	$ 37,800,000			35.0
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	173,000,000.0			160.0
Total amount outstanding under equity method investments credit facilities	$ 159,000,000.0		164,900,000	€ 147.0	€ 147.0
Guarantor obligation percentage of exposure in case of default	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	$ 160,400,000		163,200,000
Equity method investment, ownership percentage	50.00%			50.00%		50.00%
Principal amount subject to guarantee for other credit facilities	$ 25,000,000.0		25,000,000.0
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	$ 20,000,000.0		$ 0
Guarantor obligation percentage of exposure in case of default	50.00%			50.00%