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Impairment Of Long-Lived Assets And Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
Aug. 31, 2012
Goodwill [Line Items]    
Goodwill $ 77,100 $ 76,997
Company Drive-Ins [Member]
   
Goodwill [Line Items]    
Goodwill 71,100  
Franchise Operations [Member]
   
Goodwill [Line Items]    
Goodwill $ 6,000