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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Net earnings attributable to W.W. Grainger, Inc. as reported | $ | 585,730 |  |  | $ | 605,928 |  |  | $ | 768,996 |
Distributed earnings available to participating securities | (2,005 | ) |  | (2,383 | ) |  | (2,823 | )
Undistributed earnings available to participating securities | (2,678 | ) |  | (3,044 | ) |  | (4,735 | )
Numerator for basic earnings per share - Undistributed and distributed earnings available to common shareholders | 581,047 |  |  | 600,501 |  |  | 761,438 |
Undistributed earnings allocated to participating securities | 2,678 |  |  | 3,044 |  |  | 4,735 |
Undistributed earnings reallocated to participating securities | (2,663 | ) |  | (3,023 | ) |  | (4,692 | )
Numerator for diluted earnings per share - Undistributed and distributed earnings available to common shareholders | $ | 581,062 |  |  | $ | 600,522 |  |  | $ | 761,481 |
Denominator for basic earnings per share – weighted average shares | 57,674,977 |  |  | 60,430,892 |  |  | 65,156,864 |
Effect of dilutive securities | 308,190 |  |  | 409,038 |  |  | 608,257 |
Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities | 57,983,167 |  |  | 60,839,930 |  |  | 65,765,121 |
Earnings per share two-class method |  |  |  |  |  |  |
Basic | $ | 10.07 |  |  | $ | 9.94 |  |  | $ | 11.69 |
Diluted | $ | 10.02 |  |  | $ | 9.87 |  |  | $ | 11.58 |

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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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