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Property, Plant And Equipment (Details) (USD $)
 3 Months Ended 9 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Aug. 31, 2011
Property, Plant And Equipment [Abstract]          
Land $ 2,534,000 $ 2,858,000 $ 2,534,000 $ 2,858,000 $ 2,859,000
Buildings 28,496,000 29,292,000 28,496,000 29,292,000 29,372,000
Equipment 73,321,000 69,346,000 73,321,000 69,346,000 71,942,000
Other 8,834,000 6,018,000 8,834,000 6,018,000 5,521,000
Total operating property, plant and equipment 113,185,000 107,514,000 113,185,000 107,514,000 109,694,000
Accumulated depreciation (68,944,000) (64,374,000) (68,944,000) (64,374,000) (65,083,000)
Total operating property, plant and equipment, net 44,241,000 43,140,000 44,241,000 43,140,000 44,611,000
Machines 3,925,000 3,905,000 3,925,000 3,905,000 3,907,000
Barriers 17,398,000 17,997,000 17,398,000 17,997,000 18,198,000
Total property held for lease 21,323,000 21,902,000 21,323,000 21,902,000 22,105,000
Accumulated depreciation (9,421,000) (7,763,000) (9,421,000) (7,763,000) (8,251,000)
Total property held for lease, net 11,902,000 14,139,000 11,902,000 14,139,000 13,854,000
Property, plant and equipment, net 56,143,000 57,279,000 56,143,000 57,279,000 58,465,000
Depreciation expense $ 2,400,000 $ 2,200,000 $ 7,200,000 $ 6,700,000