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Stock-Based Compensation - Summary of Nucor's Restricted Stock Activity under AIP and LTIP (Detail) - Restricted Stock Units and Restricted Stock Awards [Member]
shares in Thousands
 9 Months Ended
Oct. 04, 2025
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at beginning of year, Shares | shares 248
Granted, Shares | shares 267
Vested, Shares | shares (288)
Canceled, Shares | shares 0
Unvested at October 4, 2025, Shares | shares 227
Unvested at beginning of year, Grant Date Fair Value Per Share | $ / shares $ 169.36
Granted, Grant Date Fair Value Per Share | $ / shares 133.46
Vested, Grant Date Fair Value Per Share | $ / shares 147.34
Canceled, Grant Date Fair Value Per Share | $ / shares 0
Unvested at October 4, 2025, Grant Date Fair Value Per Share | $ / shares $ 155.11