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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Earnings per Share under Two-Class Method | 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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net earnings attributable to W.W. Grainger, Inc. as reported | $ | 104,377 |  |  | $ | 162,006 |  |  | $ | 572,893 |  |  | $ | 434,671 |
Distributed earnings available to participating securities | (640 | ) |  | (603 | ) |  | (1,596 | ) |  | (1,576 | )
Undistributed earnings available to participating securities | (243 | ) |  | (806 | ) |  | (3,108 | ) |  | (1,966 | )
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders | 103,494 |  |  | 160,597 |  |  | 568,189 |  |  | 431,129 |
Undistributed earnings allocated to participating securities | 243 |  |  | 806 |  |  | 3,108 |  |  | 1,966 |
Undistributed earnings reallocated to participating securities | (242 | ) |  | (803 | ) |  | (3,086 | ) |  | (1,956 | )
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders | $ | 103,495 |  |  | $ | 160,600 |  |  | $ | 568,211 |  |  | $ | 431,139 |
Denominator for basic earnings per share – weighted average shares | 56,339,630 |  |  | 57,316,532 |  |  | 56,172,277 |  |  | 58,010,222 |
Effect of dilutive securities | 464,227 |  |  | 204,816 |  |  | 416,253 |  |  | 319,703 |
Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities | 56,803,857 |  |  | 57,521,348 |  |  | 56,588,530 |  |  | 58,329,925 |
Earnings per share two-class method |  |  |  |  |  |  |  |  |
Basic | $ | 1.84 |  |  | $ | 2.80 |  |  | $ | 10.12 |  |  | $ | 7.43 |
Diluted | $ | 1.82 |  |  | $ | 2.79 |  |  | $ | 10.04 |  |  | $ | 7.39 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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