Note 6 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss - Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Foreign currency translation adjustments		$ 9,400	$ 861	$ 17,866	$ (10,636)
Foreign currency translation adjustments		9,400	861	17,866	(10,636)
Realized loss (gain) on cash flow hedges reclassified to earnings, pre-tax	[1]	(824)	1,030	(1,589)	2,387
Realized loss (gain) on cash flow hedges reclassified to earnings	[1]	(582)	651	(1,058)	1,508
Unrealized gain (loss) on cash flow hedges recognized in AOCL, pre-tax		(1,346)	1,188	(1,345)	539
Unrealized (loss) gain on cash flow hedges recognized in AOCL		(686)	750	(686)	340
Other comprehensive income (loss), pre-tax		7,230	3,079	14,932	(7,710)
Other comprehensive income (loss)		$ 8,132	$ 2,262	$ 16,122	$ (8,788)

[1] Reclassified to Selling, General and Administrative Expenses