Accumulated Other Comprehensive Loss (Roll Forward Of Balances In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (12,108)	$ (14,172)
Current-period change	(5,980)	2,064	$ 1,136
Balance	(18,088)	(12,108)	(14,172)
Defined Benefit Pension Plan Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,450)	(2,781)
Current-period change	251	331
Balance	(2,199)	(2,450)	(2,781)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9,658)	(11,391)
Current-period change	(6,231)	1,733
Balance	$ (15,889)	$ (9,658)	$ (11,391)