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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 2018
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
 
March 31,
 
2018
 
2017
Net earnings attributable to W.W. Grainger, Inc. as reported
$
231,535

 
$
174,744

Distributed earnings available to participating securities
(612
)
 
(546
)
Undistributed earnings available to participating securities
(1,386
)
 
(932
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
229,537

 
173,266

Undistributed earnings allocated to participating securities
1,386

 
932

Undistributed earnings reallocated to participating securities
(1,378
)
 
(924
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
229,545

 
$
173,274

Denominator for basic earnings per share – weighted average shares
56,062,607

 
58,720,066

Effect of dilutive securities
340,639

 
482,816

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
56,403,246

 
59,202,882

Earnings per share two-class method
 

 
 

Basic
$
4.09

 
$
2.95

Diluted
$
4.07

 
$
2.93