Property And Equipment (Schedule Of Property And Equipment, Net) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 29,355	$ 26,770
Less: accumulated depreciation and amortization	(19,653)	(18,235)
Total	9,702	8,535	9,063
Machinery, Equipment and Vehicles [Member]
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	13,459	12,035
Building and Building Improvements [Member]
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	4,044	3,781
Computer And Office Equipment [Member]
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	3,312	3,389
Software and Software Development Costs [Member]
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	6,824	5,997
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	1,421	1,285
Land [Member]
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 295	$ 283