Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Aug. 31, 2017
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Allowance for doubtful accounts	$ 947	$ 2,084
Deferred Tax Assets, Accrued expenses	8,142	12,459
Deferred Tax Assets, Warranty	1,648	2,957
Deferred Tax Assets, Defined benefit pension plan	1,528	2,666
Deferred Tax Assets, Inventory	1,935	1,923
Deferred Tax Assets, Share-based compensation	925	1,578
Deferred Tax Assets, Vacation	797	1,422
Deferred Tax Assets, Net operating loss and capital loss carryforwards	2,868	1,420
Deferred Tax Assets, Deferred revenue	536	793
Deferred Tax Assets, Other	665	964
Gross deferred tax assets	19,991	28,266
Deferred Tax Assets, Valuation allowance	(3,562)	(2,804)
Net deferred tax assets	16,429	25,462
Deferred Tax Liabilities, Intangible assets	(6,648)	(15,422)
Deferred Tax Liabilities, Property, plant and equipment	(4,219)	(5,920)
Total deferred tax liabilities	(10,867)	(21,342)
Net deferred tax assets	$ 5,562	$ 4,120