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Stock-Based Compensation - Summary of Nucor's Restricted Stock Activity under AIP and LTIP (Detail) - Jul. 04, 2015 - Restricted Stock And Restricted Stock Units [Member] - AIP and LTIP [Member] - $ / shares
shares in Thousands
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at beginning of year, Shares 65
Granted, Shares 136
Vested, Shares (134)
Canceled, Shares 0
Unvested at end of period, Shares 67
Shares reserved for future grants 975
Unvested at beginning of year, Grant Date Fair Value $ 48.20
Granted, Grant Date Fair Value 47.07
Vested, Grant Date Fair Value 47.11
Canceled, Grant Date Fair Value 0
Unvested at end of period, Grant Date Fair Value $ 48.08