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Property and Equipment - Schedule of Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
Aug. 31, 2012
Property, Plant and Equipment [Line Items]    
Machinery, equipment and vehicles $ 12,562 $ 12,517
Buildings and improvements 3,597 3,574
Computer and office equipment 3,400 3,270
Software 5,665 5,530
Furniture and fixtures 1,215 1,229
Land 289 287
Subtotal 26,728 26,407
Less: accumulated depreciation and amortization (17,882) (17,344)
Total $ 8,846 $ 9,063