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Property And Equipment (Schedule Of Property And Equipment, Net) (Details) - USD ($)
$ in Thousands
May. 31, 2015
Aug. 31, 2014
Property Plant And Equipment [Line Items]    
Subtotal $ 32,380 $ 29,355
Less: accumulated depreciation and amortization (21,166) (19,653)
Total 11,214 9,702
Machinery, Equipment and Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 15,396 13,459
Buildings and Improvements [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 4,182 4,044
Computer And Office Equipment [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 4,001 3,312
Software [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 7,061 6,824
Furniture and Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 1,458 1,421
Land [Member]    
Property Plant And Equipment [Line Items]    
Subtotal $ 282 $ 295