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EARNINGS PER SHARE (Tables)
 12 Months Ended
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