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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per share under the two-class method (in thousands of dollars, except for share and per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net earnings attributable to W.W. Grainger, Inc. as reported | $ | 162,006 |  |  | $ | 185,873 |  |  | $ | 434,671 |  |  | $ | 545,262 |
Distributed earnings available to participating securities | (603 | ) |  | (547 | ) |  | (1,576 | ) |  | (1,749 | )
Undistributed earnings available to participating securities | (806 | ) |  | (1,085 | ) |  | (1,966 | ) |  | (3,179 | )
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders | 160,597 |  |  | 184,241 |  |  | 431,129 |  |  | 540,334 |
Undistributed earnings allocated to participating securities | 806 |  |  | 1,085 |  |  | 1,966 |  |  | 3,179 |
Undistributed earnings reallocated to participating securities | (803 | ) |  | (1,078 | ) |  | (1,956 | ) |  | (3,157 | )
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders | $ | 160,600 |  |  | $ | 184,248 |  |  | $ | 431,139 |  |  | $ | 540,356 |
Denominator for basic earnings per share – weighted average shares | 57,316,532 |  |  | 60,016,550 |  |  | 58,010,222 |  |  | 60,854,548 |
Effect of dilutive securities | 204,816 |  |  | 399,601 |  |  | 319,703 |  |  | 413,571 |
Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities | 57,521,348 |  |  | 60,416,151 |  |  | 58,329,925 |  |  | 61,268,119 |
Earnings per share two-class method |  |  |  |  |  |  |  |  |
Basic | $ | 2.80 |  |  | $ | 3.07 |  |  | $ | 7.43 |  |  | $ | 8.88 |
Diluted | $ | 2.79 |  |  | $ | 3.05 |  |  | $ | 7.39 |  |  | $ | 8.82 |

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