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Stock-Based Compensation - Summary of Nucor's Restricted Stock Unit ("RSU") Activity (Detail) - Restricted Stock Units [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 1,021
Granted, Shares | shares 624
Vested, Shares | shares (664)
Canceled, Shares | shares (25)
Unvested at October 4, 2025, Shares | shares 956
Unvested at beginning of year, Grant Date Fair Value Per Share | $ / shares $ 144.89
Granted, Grant Date Fair Value Per Share | $ / shares 109.36
Vested, Grant Date Fair Value Per Share | $ / shares 134.28
Canceled, Grant Date Fair Value Per Share | $ / shares 140.95
Unvested at October 4, 2025, Grant Date Fair Value Per Share | $ / shares $ 129.17