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EARNINGS PER SHARE - Schedule of Computation of Basic and Diluted Earnings per Share under Two-Class Method (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net earnings attributable to W.W. Grainger, Inc. as reported $ 185,873 $ 192,201 $ 545,262 $ 623,764
Distributed earnings available to participating securities (547) (676) (1,749) (2,187)
Undistributed earnings available to participating securities (1,085) (1,138) (3,179) (4,012)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders 184,241 190,387 540,334 617,565
Undistributed earnings allocated to participating securities 1,085 1,138 3,179 4,012
Undistributed earnings reallocated to participating securities (1,078) (1,129) (3,157) (3,972)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders $ 184,248 $ 190,396 $ 540,356 $ 617,605
Denominator for basic earnings per share - weighted average shares (in shares) 60,016,550 64,720,037 60,854,548 66,188,236
Effect of dilutive securities (in shares) 399,601 569,107 413,571 661,530
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares) 60,416,151 65,289,144 61,268,119 66,849,766
Basic (in dollars per share) $ 3.07 $ 2.94 $ 8.88 $ 9.33
Diluted (in dollars per share) $ 3.05 $ 2.92 $ 8.82 $ 9.24