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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2015
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,
 
2015
 
2014
 
2013
 
 
 
 
 
 
Net earnings attributable to W.W. Grainger, Inc. as reported
$
768,996

 
$
801,729

 
$
797,036

   Distributed earnings available to participating securities
(2,823
)
 
(3,154
)
 
(3,304
)
   Undistributed earnings available to participating securities
(4,735
)
 
(6,370
)
 
(8,348
)
Numerator for basic earnings per share - Undistributed and distributed earnings available to common shareholders
761,438

 
792,205

 
785,384

   Undistributed earnings allocated to participating securities
4,735

 
6,370

 
8,348

   Undistributed earnings reallocated to participating securities
(4,692
)
 
(6,290
)
 
(8,218
)
Numerator for diluted earnings per share - Undistributed and distributed earnings available to common shareholders
$
761,481

 
$
792,285

 
$
785,514

 
 
 
 
 
 
Denominator for basic earnings per share – weighted average shares
65,156,864

 
68,334,322

 
69,455,507

Effect of dilutive securities
608,257

 
871,422

 
1,120,925

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
65,765,121

 
69,205,744

 
70,576,432

Earnings per share two-class method
 

 
 

 
 
Basic
$
11.69

 
$
11.59

 
$
11.31

Diluted
$
11.58

 
$
11.45

 
$
11.13