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Equity Investments - Additional Information (Detail)
€ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 03, 2020
USD ($)
Jul. 04, 2020
USD ($)
Apr. 04, 2020
USD ($)
Sep. 28, 2019
USD ($)
Oct. 03, 2020
USD ($)
Sheet
Sep. 28, 2019
USD ($)
Dec. 31, 2019
USD ($)
Oct. 03, 2020
EUR (€)
Oct. 02, 2020
Apr. 04, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Jan. 16, 2019
Schedule Of Equity Method Investments [Line Items]                        
Equity method investments $ 521,200,000       $ 521,200,000   $ 793,200,000          
Amortization         62,877,000 $ 64,655,000            
NuMit LLC [Member]                        
Schedule Of Equity Method Investments [Line Items]                        
Equity method investments $ 322,500,000       $ 322,500,000   319,800,000          
Equity method investment, ownership percentage 50.00%       50.00%     50.00%        
Period used for lag basis, in months         1 month              
Distributions from affiliates         $ 2,000,000.0 27,400,000            
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 $ 100,000       $ 100,000   263,000,000.0          
Equity method investment, ownership percentage 50.00%       50.00%     50.00% 50.00%      
Period used for lag basis, in months         1 month              
Equity method investments, share of net assets $ 128,600,000       $ 128,600,000              
Equity method investments impairment charges 6,600,000 $ 5,000,000.0 $ 250,000,000.0   261,600,000              
Basis difference due to the step-up to fair value of certain assets and liabilities (128,500,000)       (128,500,000)              
Step-up to fair value of equity method investment, portion related to identification of goodwill             86,500,000          
Amortization (1,900,000)     $ 2,200,000 (1,600,000) $ 6,700,000            
Due from related parties, noncurrent 41,000,000.0       $ 41,000,000.0   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              
Equity method investment, remaining ownership percentage                 50.00%      
Due from related parties     $ 41,000,000.0             € 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 187,500,000       $ 187,500,000     160.0        
Total amount outstanding under equity method investments credit facilities $ 154,700,000       $ 154,700,000   164,900,000 € 132.0     € 147.0  
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 $ 150,300,000       $ 150,300,000   163,200,000          
Equity method investment, ownership percentage 50.00%       50.00%     50.00%       50.00%
Principal amount subject to guarantee for other credit facilities $ 25,000,000.0       $ 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       65,000,000.0              
Total amount outstanding under equity method investments credit facilities $ 45,000,000.0       $ 45,000,000.0   $ 0          
Guarantor obligation percentage of exposure in case of default 50.00%       50.00%     50.00%