Income Taxes (Schedule Of Deferred Tax Assets And Liabilities)(Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Aug. 31, 2011
Income Taxes [Abstract]
Deferred Tax Assets, Deferred rental revenue	$ 382	$ 1,233
Deferred Tax Assets, Employee benefits liability	1,282	1,305
Deferred Tax Assets, Net operatig loss carryfowards	284	74
Deferred Tax Assets, Defined benefit pension plan	1,554	1,306
Deferred Tax Assets, Share-based compensation	2,284	1,614
Deferred Tax Assets, State tax credits	48	802
Deferred Tax Assets, Inventory	633	789
Deferred Tax Assets, Warranty	1,686	1,268
Deferred Tax Assets, Vacation	224	200
Deferred Tax Assets, Accrued expenses and allowances	6,610	5,039
Total deferred tax assets	14,987	13,630
Deferred Tax Liabilities, Intangible assets	(6,195)	(7,088)
Deferred Tax Liabilities, Property, Plant and Equipment	(8,210)	(9,054)
Deferred Tax Liabilities, Inventory	(115)	(113)
Deferred Tax Liabilities, Other	(296)	(1,058)
Total deferred tax liabilities	(14,816)	(17,313)
Net deferred tax liabilities	$ 171	$ (3,683)