Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Taxes [Abstract]
Deferred Tax Assets, Accrued expenses and allowances	$ 12,459	$ 13,053
Deferred Tax Assets, Warranty	2,957	2,708
Deferred Tax Assets, Defined benefit pension plan	2,666	2,917
Deferred Tax Assets, Inventory	2,101	1,898
Deferred Tax Assets, Share-based compensation	1,578	1,845
Deferred Tax Assets, Vacation	1,422	1,365
Deferred Tax Assets, Net operating loss carry forwards	1,420	1,174
Deferred Tax Assets, Deferred revenue	793	1,501
Deferred Tax Assets, Other	2,834	2,603
Gross deferred tax assets	28,230	29,064
Deferred Tax Assets, Valuation allowance	(2,804)	(2,825)	$ (2,900)
Net deferred tax assets	25,426	26,239
Deferred Tax Liabilities, Intangible assets	(15,422)	(16,426)
Deferred Tax Liabilities, Property, plant and equipment	(5,706)	(6,609)
Deferred Tax Liabilities, Inventory	(178)	(203)
Total deferred tax liabilities	(21,306)	(23,238)
Net deferred tax assets	$ 4,120	$ 3,001