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CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Net sales $ 10,137,204 $ 9,973,384 $ 9,964,953
Cost of merchandise sold 6,022,647 5,741,956 5,650,711
Gross profit 4,114,557 4,231,428 4,314,242
Warehousing, marketing and administrative expenses 2,995,060 2,931,108 2,967,125
Operating earnings 1,119,497 1,300,320 1,347,117
Other income and (expense):      
Interest income 717 1,166 2,068
Interest expense (66,332) (33,571) (10,093)
Loss from equity method investment (31,193) (11,740) 0
Other non-operating income 1,300 1,102 483
Other non-operating expense (4,931) (6,572) (5,189)
Total other expense (100,439) (49,615) (12,731)
Earnings before income taxes 1,019,058 1,250,705 1,334,386
Income taxes 386,220 465,531 522,090
Net earnings 632,838 785,174 812,296
Less: Net earnings attributable to noncontrolling interest 26,910 16,178 10,567
Net earnings attributable to W.W. Grainger, Inc. $ 605,928 $ 768,996 $ 801,729
Earnings per share:      
Basic (in dollars per share) $ 9.94 $ 11.69 $ 11.59
Diluted (in dollars per share) $ 9.87 $ 11.58 $ 11.45
Weighted average number of shares outstanding:      
Basic (in shares) 60,430,892 65,156,864 68,334,322
Diluted (in shares) 60,839,930 65,765,121 69,205,744