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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 170,816	$ 193,409	$ 460,628	$ 564,498
Other comprehensive earnings:
Foreign currency translation adjustments, net of reclassification (see Note 5)	24,563	(12,866)	100,409	31,709
Postretirement benefit plan re-measurement, net of tax expense $29,172 (see Note 7)	46,543	0	46,543	0
Postretirement benefit plan reclassification, net of tax benefit of $962, $631, and $2,720, $1,893, respectively	(1,540)	(1,008)	(4,338)	(3,026)
Other	1	188	(11)	844
Comprehensive earnings, net of tax	240,383	179,723	603,231	594,025
Less: Comprehensive earnings attributable to noncontrolling interest
Net earnings	8,810	7,536	25,957	19,236
Foreign currency translation adjustments	(8)	2,188	4,338	16,621
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 231,581	$ 169,999	$ 572,936	$ 558,168

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