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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Net earnings attributable to W.W. Grainger, Inc. as reported
$
236,981

 
$
97,921

 
$
468,516

 
$
272,665

Distributed earnings available to participating securities
(345
)
 
(427
)
 
(956
)
 
(973
)
Undistributed earnings available to participating securities
(1,473
)
 
(217
)
 
(2,861
)
 
(1,159
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
235,163

 
97,277

 
464,699

 
270,533

Undistributed earnings allocated to participating securities
1,473

 
217

 
2,861

 
1,159

Undistributed earnings reallocated to participating securities
(1,462
)
 
(216
)
 
(2,841
)
 
(1,152
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
235,174

 
$
97,278

 
$
464,719

 
$
270,540

Denominator for basic earnings per share – weighted average shares
56,109,809

 
58,012,731

 
56,086,592

 
58,363,416

Effect of dilutive securities
442,835

 
274,581

 
392,053

 
377,846

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
56,552,644

 
58,287,312

 
56,478,645

 
58,741,262

Earnings per share two-class method
 

 
 

 
 
 
 
Basic
$
4.19

 
$
1.68

 
$
8.29

 
$
4.64

Diluted
$
4.16

 
$
1.67

 
$
8.23

 
$
4.61