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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 193,409	$ 196,622	$ 564,498	$ 636,003
Foreign currency translation adjustments:
Foreign currency translation gain (loss)	(12,866)	(53,062)	31,709	(120,016)
Defined postretirement benefit plan:
Reclassification adjustments related to amortization, net of tax benefit of $631, $510, and $1,893, $1,531, respectively	(1,008)	(813)	(3,026)	(2,436)
Derivative instrument change in fair value of cash flow hedge	188	256	844	983
Comprehensive earnings, net of tax	179,723	143,003	594,025	514,534
Less: Comprehensive earnings attributable to noncontrolling interest
Net earnings	7,536	4,421	19,236	12,239
Foreign currency translation adjustments	2,188	1,521	16,621	(281)
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 169,999	$ 137,061	$ 558,168	$ 502,576

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