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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Net sales $ 2,831,429 $ 2,635,999 $ 8,458,042 $ 7,792,397
Cost of goods sold 1,752,194 1,618,819 5,176,107 4,716,069
Gross profit 1,079,235 1,017,180 3,281,935 3,076,328
Selling, general and administrative expenses 890,113 739,442 2,413,997 2,277,009
Operating earnings 189,122 277,738 867,938 799,319
Other income (expense):        
Interest income 2,003 707 3,645 1,365
Interest expense (22,353) (23,790) (69,942) (64,971)
Losses from equity method investment (3,731) (10,635) (18,271) (25,130)
Other, net 5,976 5,978 18,001 17,284
Total other expense, net (18,105) (27,740) (66,567) (71,452)
Earnings before income taxes 171,017 249,998 801,371 727,867
Income taxes 55,972 79,182 197,798 267,239
Net earnings 115,045 170,816 603,573 460,628
Less: Net earnings attributable to noncontrolling interest 10,668 8,810 30,680 25,957
Net earnings attributable to W.W. Grainger, Inc. $ 104,377 $ 162,006 $ 572,893 $ 434,671
Earnings per share:        
Basic (in dollars per share) $ 1.84 $ 2.80 $ 10.12 $ 7.43
Diluted (in dollars per share) $ 1.82 $ 2.79 $ 10.04 $ 7.39
Weighted average number of shares outstanding:        
Basic (in shares) 56,339,630 57,316,532 56,172,277 58,010,222
Diluted (in shares) 56,803,857 57,521,348 56,588,530 58,329,925
Cash dividends paid per share (in dollars per share) $ 1.36 $ 1.28 $ 4.00 $ 3.78