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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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