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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Aug. 31, 2012
Schedule of Valuation And Qualifying Accounts
 Receivable reserve
  and billing adjustments*
 
Balance at
Beginning
 of Year
   
Charged to
Expense/
Against Revenue
   
Write-offs,
Net of
 Recoveries
   
Balance at
End of Year
 
2012
  $ 1,955     $ 1,863     $ 1,988     $ 1,830  
2011
  $ 1,862     $ 1,748     $ 1,655     $ 1,955  
2010
  $ 1,712     $ 2,903     $ 2,753     $ 1,862