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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 247,743	$ 106,959	$ 488,528	$ 289,812
Other comprehensive (losses) earnings:
Foreign currency translation adjustments (see Note 6)	(48,471)	46,543	(25,355)	75,846
Postretirement benefit plan reclassification, net of tax benefit of $825, $878, $1,650 and $1,757, respectively	(2,438)	(1,400)	(4,877)	(2,798)
Other	17	0	22	(12)
Total other comprehensive (losses) earnings	(50,892)	45,143	(30,210)	73,036
Comprehensive earnings, net of tax	196,851	152,102	458,318	362,848
Less: Comprehensive (losses) earnings attributable to noncontrolling interest
Net earnings	10,762	9,038	20,012	17,147
Foreign currency translation adjustments	(6,136)	(1,186)	2,224	4,346
Comprehensive earnings attributable to noncontrolling interest	4,626	7,852	22,236	21,493
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 192,225	$ 144,250	$ 436,082	$ 341,355

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