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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales $ 2,478,258 $ 2,532,900 $ 2,522,565 $ 2,439,661 $ 2,510,959 $ 2,562,263 $ 2,506,104 $ 2,385,627 $ 9,973,384 $ 9,964,953 $ 9,437,758
Cost of merchandise sold 1,475,884 1,471,021 1,449,133 1,345,918 1,456,158 1,459,479 1,425,418 1,309,656 5,741,956 5,650,711 5,301,275
Gross profit 1,002,374 1,061,879 1,073,432 1,093,743 1,054,801 1,102,784 1,080,686 1,075,971 4,231,428 4,314,242 4,136,483
Warehousing, marketing and administrative expenses 750,747 721,150 716,715 742,496 788,287 717,271 739,935 721,632 2,931,108 2,967,125 2,839,629
Operating earnings 251,627 340,729 356,717 351,247 266,514 385,513 340,751 354,339 1,300,320 1,347,117 1,296,854
Net earnings attributable to W.W. Grainger, Inc. $ 145,232 $ 192,201 $ 220,548 $ 211,015 $ 148,839 $ 230,322 $ 205,915 $ 216,653 $ 768,996 $ 801,729 $ 797,036
Earnings per share - basic $ 2.32 $ 2.94 $ 3.28 $ 3.11 $ 2.17 $ 3.33 $ 2.97 $ 3.11 $ 11.69 $ 11.59 $ 11.31
Earnings per share - diluted $ 2.30 $ 2.92 $ 3.25 $ 3.07 $ 2.14 $ 3.30 $ 2.94 $ 3.07 $ 11.58 $ 11.45 $ 11.13