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Segment Information (Schedule Of EBITDA Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Segment Reporting Information [Line Items]      
Adjusted EBITDA $ (27,056) $ (21,157) $ (14,440)
Share-based compensation (3,835) (2,788) (1,099)
Severance costs   (150) (920)
Other     (954)
Depreciation (3,142) (3,567) (3,669)
Amortization (2,499) (3,540) (3,760)
Income from operations 17,580 11,112 4,038
Interest income 18 21 34
Interest expense (2,482) (2,687) (2,892)
Discount on related party note receivable (1,369)    
Income from continuing operations before income taxes 13,747 8,446 1,180
Reportable Unit Assets [Member]
      
Segment Reporting Information [Line Items]      
Adjusted EBITDA (32,018) (28,015) (18,412)
Depreciation (1,801) (2,158) (2,177)
Amortization (2,499) (3,540) (3,760)
Corporate And Eliminations [Member]
      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 4,962 6,858 3,972
Depreciation $ (1,341) $ (1,409) $ (1,492)