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Schedule Of Valuation And Qualifying Accounts (Allowance For Uncollectible Trade Accounts Receivables) (Details) (USD $)
In Thousands
12 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Balance at end of period$ 4,788$ 13,939 
Allowance For Uncollectible Trade Accounts Receivables [Member]
   
Balance at beginning of period13,93915,51010,116
Additions and adjustments charged to costs and expenses5,179(881)8,450
Additions/(Reductions) charged to other accounts(6,428)  
Write-offs(7,902)(690)(3,056)
Balance at end of period$ 4,788$ 13,939$ 15,510