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Property, Plant And Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 148,088 $ 132,134  
Accumulated depreciation (83,674) (76,508)  
Total operating property, plant and equipment, net 64,414 55,626  
Machines 4,395 3,965  
Barriers 17,213 17,323  
Total property held for lease 21,608 21,288  
Accumulated depreciation (13,565) (11,850)  
Total property held for lease, net 8,043 9,438  
Property, plant and equipment, net 72,457 65,064  
Depreciation expense 10,800 9,800 9,600
Land [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 3,315 3,342  
Building [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 38,573 34,066  
Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment 91,254 85,689  
Other [Member]
      
Property, Plant and Equipment [Line Items]      
Total operating property, plant and equipment $ 14,946 $ 9,037