CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 39,266	$ 19,328	$ 75,873	$ 54,893
Foreign currency translation adjustment:
Foreign currency translation adjustment during the period	27,109	3,817	15,129	(13,967)
Other comprehensive income before reclassifications	27,477	3,801	16,055	(13,424)
Reclassification for translation loss realized upon liquidation of investment in foreign entity	968	0	968	0
Foreign currency translation adjustment during the period	28,077	3,817	16,097	(13,967)
Net unrealized gain (loss) on derivatives:
Unrealized holding gain (loss)	254	(16)	696	469
Reclassification for (gain) loss included in net earnings	(333)	32	(853)	(142)
Net unrealized gain (loss) on derivatives	(79)	16	(157)	327
Defined benefit obligation:
Amortization of prior services	(9)	(2)	(27)	(5)
Defined benefit obligation	(9)	(2)	(27)	(5)
Other comprehensive income (loss)	27,989	3,831	15,913	(13,645)
Comprehensive income	$ 67,255	$ 23,159	$ 91,786	$ 41,248