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Property And Equipment (Schedule Of Property And Equipment, Net) (Details) - USD ($)
$ in Thousands
Feb. 28, 2019
Aug. 31, 2018
Property Plant And Equipment [Line Items]    
Subtotal $ 68,032 $ 62,790
Less: accumulated depreciation and amortization (28,557) (26,433)
Total 39,475 36,357
Machinery, Equipment and Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 18,378 17,848
Buildings And Improvements [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 17,140 17,100
Computer And Office Equipment [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 5,375 5,046
Software [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 10,170 9,481
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 1,914 1,820
Capital In Progress [Member]    
Property Plant And Equipment [Line Items]    
Subtotal 11,598 8,042
Land [Member]    
Property Plant And Equipment [Line Items]    
Subtotal $ 3,457 $ 3,453