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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Net sales $ 2,506,538 $ 2,439,661
Cost of merchandise sold 1,461,485 1,345,918
Gross profit 1,045,053 1,093,743
Warehousing, marketing and administrative expenses 727,961 742,496
Operating earnings 317,092 351,247
Other income and (expense):    
Interest income 165 192
Interest expense (13,725) (1,636)
Loss from equity method investment (6,388) 0
Other non-operating income 694 241
Other non-operating expense (254) (2,405)
Total other expense (19,508) (3,608)
Earnings before income taxes 297,584 347,639
Income taxes 105,940 133,493
Net earnings 191,644 214,146
Less: Net earnings attributable to noncontrolling interest 4,931 3,131
Net earnings attributable to W.W. Grainger, Inc. $ 186,713 $ 211,015
Earnings per share:    
Basic (in dollars per share) $ 3.00 $ 3.11
Diluted (in dollars per share) $ 2.98 $ 3.07
Weighted average number of shares outstanding:    
Basic (in shares) 61,668,682 67,229,653
Diluted (in shares) 62,099,801 67,982,362
Cash dividends paid per share (in dollars per share) $ 1.17 $ 1.08