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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 28, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Plans Activity | A summary of activity under Nucor’s stock option plans for the first nine months of 2019 is as follows (in thousands, except years and per share amounts):
|  |  |  |  |  | Weighted- |  |  | Weighted- |  |  |  |
|  |  |  |  |  | Average |  |  | Average |  | Aggregate |
|  |  |  |  |  | Exercise |  |  | Remaining |  | Intrinsic |
|  | Shares |  |  | Price |  |  | Contractual Life |  | Value |
Number of shares under stock options: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year |  |  | 3,828 |  |  | $ | 49.71 |  |  |  |  |  |  |
Granted |  |  | 489 |  |  | $ | 48.00 |  |  |  |  |  |  |
Exercised |  |  | (153 | ) |  | $ | 38.56 |  |  |  |  | $ | 3,058 |
Canceled |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Outstanding at September 28, 2019 |  |  | 4,164 |  |  | $ | 49.92 |  |  | 5.9 years |  | $ | 11,151 |
Stock options exercisable at September 28, 2019 |  |  | 2,914 |  |  | $ | 47.13 |  |  | 4.7 years |  | $ | 10,283 |
Summary of Nucor's RSU Activity | The fair value of an RSU is determined based on the closing price of Nucor’s common stock on the date of the grant. A summary of Nucor’s RSU activity for the first nine months of 2019 is as follows (shares in thousands):
|  | Shares |  |  | Grant Date Fair Value |
Restricted stock units: |  |  |  |  |  |  |  |
Unvested at beginning of year |  |  | 1,246 |  |  | $ | 59.09 |
Granted |  |  | 1,770 |  |  | $ | 48.00 |
Vested |  |  | (1,177 | ) |  | $ | 52.39 |
Canceled |  |  | (29 | ) |  | $ | 57.53 |
Unvested at September 28, 2019 |  |  | 1,810 |  |  | $ | 52.62 |
Summary of Nucor's Restricted Stock Activity under AIP and LTIP | A summary of Nucor’s restricted stock activity under the AIP and the LTIP for the first nine months of 2019 is as follows (shares in thousands):
|  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Restricted stock units and restricted stock awards: |  |  |  |  |  |  |  |
Unvested at beginning of year |  |  | 130 |  |  | $ | 62.97 |
Granted |  |  | 316 |  |  | $ | 58.04 |
Vested |  |  | (296 | ) |  | $ | 58.78 |
Canceled |  |  | - |  |  | $ | - |
Unvested at September 28, 2019 |  |  | 150 |  |  | $ | 60.84 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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