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EARNINGS PER SHARE (Tables)
 9 Months Ended
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