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Property And Equipment (Schedule Of Property And Equipment, Net) (Details) - USD ($)
$ in Thousands
Nov. 30, 2018
Aug. 31, 2018
Property Plant And Equipment [Line Items]    
Subtotal $ 63,681 $ 62,790
Less: accumulated depreciation and amortization (27,269) (26,433)
Total 36,412 36,357
Machinery, Equipment and Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 17,902 17,848
Buildings And Improvements [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 17,038 17,100
Computer And Office Equipment [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 5,108 5,046
Software [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 9,674 9,481
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 1,777 1,820
Capital In Progress [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 8,731 8,042
Land [Member]    
Property Plant And Equipment [Line Items]    
Subtotal $ 3,451 $ 3,453