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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 240,785	$ 182,853
Other comprehensive earnings:
Foreign currency translation adjustments	23,116	29,303
Postretirement benefit plan reclassification, net of tax benefit of $825 and $879, respectively	(2,439)	(1,398)
Other	5	(12)
Comprehensive earnings, net of tax	261,467	210,746
Less: Comprehensive earnings attributable to noncontrolling interest
Net earnings	9,250	8,109
Foreign currency translation adjustments	8,360	5,532
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 243,857	$ 197,105

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