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Property, Plant And Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 159,522 $ 158,142  
Accumulated depreciation (90,210) (88,750)  
Total operating property, plant and equipment, net 69,312 69,392  
Machines 6,868 5,769  
Barriers 16,306 17,687  
Total property held for lease 23,174 23,456  
Accumulated depreciation (14,859) (14,192)  
Total property held for lease, net 8,315 9,264  
Property, plant and equipment, net 77,627 78,656  
Depreciation expense 12,200 11,700 $ 10,800
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 4,817 4,721  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 48,417 44,032  
Machinery And Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 73,185 70,605  
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 24,787 29,649  
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 8,316 $ 9,135