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Summary Of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
12 Months Ended
Aug. 31, 2015
USD ($)
segment
Aug. 31, 2014
USD ($)
Aug. 31, 2013
USD ($)
Summary Of Significant Accounting Policies [Abstract]      
Number of Operating Segments | segment 1    
Number of Reportable Segments | segment 1    
Total restricted cash $ 19,800    
Restricted cash (current) 13,246 $ 13,208  
Restricted cash (noncurrent) 6,524 6,652  
Goodwill impairment 0 0  
Advertising and promotion costs $ 24,500 22,400 $ 22,400
Reimbursed administration costs, percent 15.00%    
Reimbursed administration costs $ 5,000 $ 4,400 $ 4,200