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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 115,045	$ 170,816	$ 603,573	$ 460,628
Other comprehensive (losses) earnings:
Foreign currency translation adjustments	213	24,563	(25,142)	100,409
Postretirement benefit plan re-measurement, net of tax expense $29,172 (see note 8)	0	46,543	0	46,543
Postretirement benefit plan reclassification, net of tax benefit of $825, $962, $2,475 and $2,720, respectively	(2,440)	(1,540)	(7,317)	(4,338)
Other	1	1	23	(11)
Total other comprehensive (losses) earnings	(2,226)	69,567	(32,436)	142,603
Comprehensive earnings, net of tax	112,819	240,383	571,137	603,231
Less: Comprehensive earnings (losses) attributable to noncontrolling interest
Net earnings	10,668	8,810	30,680	25,957
Foreign currency translation adjustments	(4,472)	(8)	(2,248)	4,338
Comprehensive earnings attributable to noncontrolling interest	6,196	8,802	28,432	30,295
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 106,623	$ 231,581	$ 542,705	$ 572,936

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