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Property, Plant And Equipment (Details) (USD $)
 3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Aug. 31, 2011
Property, Plant And Equipment [Abstract]          
Land $ 2,596,000 $ 2,830,000 $ 2,596,000 $ 2,830,000 $ 2,859,000
Buildings 28,951,000 28,962,000 28,951,000 28,962,000 29,372,000
Equipment 74,006,000 68,305,000 74,006,000 68,305,000 71,942,000
Other 7,094,000 6,573,000 7,094,000 6,573,000 5,521,000
Total operating property, plant and equipment 112,647,000 106,670,000 112,647,000 106,670,000 109,694,000
Accumulated depreciation (68,085,000) (62,363,000) (68,085,000) (62,363,000) (65,083,000)
Total operating property, plant and equipment, net 44,562,000 44,307,000 44,562,000 44,307,000 44,611,000
Machines 3,962,000 3,890,000 3,962,000 3,890,000 3,907,000
Barriers 17,804,000 17,123,000 17,804,000 17,123,000 18,198,000
Total property held for lease 21,766,000 21,013,000 21,766,000 21,013,000 22,105,000
Accumulated depreciation (9,092,000) (7,179,000) (9,092,000) (7,179,000) (8,251,000)
Total property held for lease, net 12,674,000 13,834,000 12,674,000 13,834,000 13,854,000
Property, plant and equipment, net 57,236,000 58,141,000 57,236,000 58,141,000 58,465,000
Depreciation expense $ 2,400,000 $ 2,300,000 $ 4,800,000 $ 4,500,000