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Property And Equipment (Schedule Of Property And Equipment, Net) (Details) - USD ($)
$ in Thousands
May 31, 2016
Aug. 31, 2015
Property Plant And Equipment [Line Items]    
Subtotal $ 34,501 $ 32,469
Less: accumulated depreciation and amortization (22,447) (21,093)
Total 12,054 11,376
Machinery, Equipment And Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 17,056 15,585
Buildings And Improvements [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 4,350 4,264
Computer And Office Equipment [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 3,972 3,895
Software [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 7,432 7,029
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 1,419 1,414
Land [Member]    
Property Plant And Equipment [Line Items]    
Subtotal $ 272 $ 282