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Property, Plant And Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 132,134 $ 115,293  
Accumulated depreciation (76,508) (70,596)  
Total operating property, plant and equipment, net 55,626 44,697  
Machines 3,965 3,945  
Barriers 17,323 17,457  
Total property held for lease 21,288 21,402  
Accumulated depreciation (11,850) (9,919)  
Total property held for lease, net 9,438 11,483  
Property, plant and equipment, net 65,064 56,180  
Depreciation expense 9,800 9,600 9,000
Land [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 3,342 2,541  
Building [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 34,066 28,652  
Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 85,689 75,097  
Other [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 9,037 $ 9,003