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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 13,850	$ 10,169	$ 33,592	$ 46,980
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustment	514	11,943	(9,143)	14,778
Reclassification for translation loss realized upon liquidation of investment in foreign entity	936	0	837	0
Foreign currency translation adjustment	1,450	11,943	(8,306)	14,778
Net unrealized gain (loss) on derivatives:
Unrealized holding gain (loss)	(86)	14	(121)	25
Reclassification for gain included in net earnings	(42)	(74)	(84)	(180)
Net unrealized loss on derivatives	(128)	(60)	(205)	(155)
Defined benefit obligation:
Amortization of prior services	(8)	(7)	(15)	(13)
Reclassification for settlement losses	0	0	1,316	437
Defined benefit obligation	(8)	(7)	1,301	424
Other comprehensive income (loss)	1,314	11,876	(7,210)	15,047
Comprehensive income	$ 15,164	$ 22,045	$ 26,382	$ 62,027

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