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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2017
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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Net earnings attributable to W.W. Grainger, Inc. as reported
$
162,006

 
$
185,873

 
$
434,671

 
$
545,262

Distributed earnings available to participating securities
(603
)
 
(547
)
 
(1,576
)
 
(1,749
)
Undistributed earnings available to participating securities
(806
)
 
(1,085
)
 
(1,966
)
 
(3,179
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
160,597

 
184,241

 
431,129

 
540,334

Undistributed earnings allocated to participating securities
806

 
1,085

 
1,966

 
3,179

Undistributed earnings reallocated to participating securities
(803
)
 
(1,078
)
 
(1,956
)
 
(3,157
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
160,600

 
$
184,248

 
$
431,139

 
$
540,356

Denominator for basic earnings per share – weighted average shares
57,316,532

 
60,016,550

 
58,010,222

 
60,854,548

Effect of dilutive securities
204,816

 
399,601

 
319,703

 
413,571

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
57,521,348

 
60,416,151

 
58,329,925

 
61,268,119

Earnings per share two-class method
 

 
 

 
 
 
 
Basic
$
2.80

 
$
3.07

 
$
7.43

 
$
8.88

Diluted
$
2.79

 
$
3.05

 
$
7.39

 
$
8.82