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Property, Plant And Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 158,142 $ 148,088  
Accumulated depreciation (88,750) (83,674)  
Total operating property, plant and equipment, net 69,392 64,414  
Machines 5,769 4,395  
Barriers 17,687 17,213  
Total property held for lease 23,456 21,608  
Accumulated depreciation (14,192) (13,565)  
Total property held for lease, net 9,264 8,043  
Property, plant and equipment, net 78,656 72,457  
Depreciation expense 11,700 10,800 $ 9,800
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 4,721 3,315  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 44,032 38,573  
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 100,254 91,254  
Other [Member]      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 9,135 $ 14,946