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Property And Equipment (Schedule Of Property And Equipment, Net) (Details) - USD ($)
$ in Thousands
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Property Plant And Equipment [Line Items]      
Subtotal $ 32,469 $ 29,355  
Less: accumulated depreciation and amortization (21,093) (19,653)  
Total [1] 11,376 9,702 $ 8,535
Machinery, Equipment And Vehicles [Member]      
Property Plant And Equipment [Line Items]      
Subtotal 15,585 13,459  
Buildings And Improvements [Member]      
Property Plant And Equipment [Line Items]      
Subtotal 4,264 4,044  
Computer And Office Equipment [Member]      
Property Plant And Equipment [Line Items]      
Subtotal 3,895 3,312  
Software [Member]      
Property Plant And Equipment [Line Items]      
Subtotal 7,029 6,824  
Furniture And Fixtures [Member]      
Property Plant And Equipment [Line Items]      
Subtotal 1,414 1,421  
Land [Member]      
Property Plant And Equipment [Line Items]      
Subtotal $ 282 $ 295  
[1] Includes tangible assets and property and equipment, net, attributed to the geographic location in which such assets are located.