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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]                      
Net sales $ 2,470,710 $ 2,596,288 $ 2,563,668 $ 2,506,538 $ 2,478,258 $ 2,532,900 $ 2,522,565 $ 2,439,661 $ 10,137,204 $ 9,973,384 $ 9,964,953
Cost of merchandise sold 1,481,017 1,556,536 1,523,609 1,461,485 1,475,884 1,471,021 1,449,133 1,345,918 6,022,647 5,741,956 5,650,711
Gross profit 989,693 1,039,752 1,040,059 1,045,053 1,002,374 1,061,879 1,073,432 1,093,743 4,114,557 4,231,428 4,314,242
Warehousing, marketing and administrative expenses 815,464 717,165 734,470 727,961 750,747 721,150 716,715 742,496 2,995,060 2,931,108 2,967,125
Operating earnings 174,229 322,587 305,589 317,092 251,627 340,729 356,717 351,247 1,119,497 1,300,320 1,347,117
Net earnings attributable to W.W. Grainger, Inc. $ 60,666 $ 185,873 $ 172,676 $ 186,713 $ 145,232 $ 192,201 $ 220,548 $ 211,015 $ 605,928 $ 768,996 $ 801,729
Earnings per share - basic (in dollars per share) $ 1.02 $ 3.07 $ 2.81 $ 3.00 $ 2.32 $ 2.94 $ 3.28 $ 3.11 $ 9.94 $ 11.69 $ 11.59
Earnings per share - diluted (in dollars per share) $ 1.01 $ 3.05 $ 2.79 $ 2.98 $ 2.30 $ 2.92 $ 3.25 $ 3.07 $ 9.87 $ 11.58 $ 11.45