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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Net sales $ 2,635,999 $ 2,596,288 $ 7,792,397 $ 7,666,494
Cost of merchandise sold 1,618,819 1,556,536 4,716,069 4,541,629
Gross profit 1,017,180 1,039,752 3,076,328 3,124,865
Warehousing, marketing and administrative expenses 736,010 717,165 2,267,605 2,179,596
Operating earnings 281,170 322,587 808,723 945,269
Other income (expense):        
Interest income 707 147 1,365 474
Interest expense (21,765) (18,024) (58,649) (48,556)
Loss from equity method investment (10,635) (10,333) (25,130) (22,147)
Other non-operating income and (expense) 521 (1,192) 1,558 (1,291)
Total other expense (31,172) (29,402) (80,856) (71,520)
Earnings before income taxes 249,998 293,185 727,867 873,749
Income taxes 79,182 99,776 267,239 309,251
Net earnings 170,816 193,409 460,628 564,498
Less: Net earnings attributable to noncontrolling interest 8,810 7,536 25,957 19,236
Net earnings attributable to W.W. Grainger, Inc. $ 162,006 $ 185,873 $ 434,671 $ 545,262
Earnings per share:        
Basic (in dollars per share) $ 2.80 $ 3.07 $ 7.43 $ 8.88
Diluted (in dollars per share) $ 2.79 $ 3.05 $ 7.39 $ 8.82
Weighted average number of shares outstanding:        
Basic (in shares) 57,316,532 60,016,550 58,010,222 60,854,548
Diluted (in shares) 57,521,348 60,416,151 58,329,925 61,268,119
Cash dividends paid per share (in dollars per share) $ 1.28 $ 1.22 $ 3.78 $ 3.61