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Property, Plant, and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Aug. 31, 2011
Property, Plant And Equipment [Abstract]      
Property, plant, and equipment, net $ 56,975 $ 56,794 $ 58,465
Total operating property, plant, and equipment, net 43,810 42,894 44,611
Total operating property, plant and equipment 109,819 103,143 109,694
Land 2,587 2,777 2,859
Buildings 28,760 28,521 29,372
Equipment 72,242 67,226 71,942
Other 6,230 4,619 5,521
Accumulated depreciation (66,009) (60,249) (65,083)
Total property held for lease, net 13,165 13,900 13,854
Accumulated depreciation (8,571) (6,585) (8,251)
Total property held for lease 21,736 20,485 22,105
Barriers 17,833 16,633 18,198
Machines 3,903 3,852 3,907
Depreciation expense $ 2,400 $ 2,200