CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 30,332	$ 10,502	$ 36,607	$ 35,565
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustment	9,551	4,211	(11,980)	(17,784)
Net unrealized gain (loss) on derivatives:
Unrealized holding gain, net of income taxes of $106, $221, $116 and $74	310	494	442	485
Reclassification for gain included in net earnings, net of income taxes of $(64), $(28), $(111) and $(77)	(330)	(56)	(520)	(174)
Net unrealized gain (loss) on derivatives, net of income taxes of $42, $193, $5 and $(3)	(20)	438	(78)	311
Defined benefit obligation:
Amortization of prior services, net of income taxes of $(2), $0, $(4) and $(1)	(9)	(2)	(18)	(3)
Defined benefit obligation, net of income taxes of $(2), $0, $(4) and $(1)	(9)	(2)	(18)	(3)
Other comprehensive income (loss)	9,522	4,647	(12,076)	(17,476)
Comprehensive income	$ 39,854	$ 15,149	$ 24,531	$ 18,089