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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 191,644	$ 214,146
Foreign currency translation adjustments:
Foreign currency translation adjustments, net of tax benefit of $0 and $0, respectively	51,490	(76,015)
Defined postretirement benefit plan:
Reclassification adjustments related to amortization, net of tax expense of $631 and $509, respectively	(1,009)	(813)
Derivative instrument change in fair value of cash flow hedge	304	482
Comprehensive earnings, net of tax	242,429	137,800
Less: Comprehensive earnings (losses) attributable to noncontrolling interest
Net earnings	4,931	3,131
Foreign currency translation adjustments	5,704	(294)
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 231,794	$ 134,963

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