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Segment Information (Tables)
12 Months Ended
Aug. 31, 2012
Segment Information [Abstract]  
Reconciliation Of Reported Revenue, Income From Operations From Segments And income Before Income Taxes
    2012     2011     2010  
Revenues:                  
Company Drive-Ins $ 404,443   $ 410,820   $ 414,369  
Franchise Operations   134,588     131,894     132,016  
Unallocated revenues   4,699     3,237     4,541  
  $ 543,730   $ 545,951   $ 550,926  
 
Income from Operations:                  
Company Drive-Ins $ 56,973   $ 54,584   $ 59,710  
Franchise Operations   134,588     131,894     132,016  
Unallocated income   5,230     3,822     3,778  
Unallocated expenses:                  
Selling, general and administrative   (65,173 )   (64,943 )   (66,847 )
Depreciation and amortization   (41,914 )   (41,225 )   (42,615 )
Provision for impairment of long-lived assets   (764 )   (824 )   (15,161 )
Income from operations   88,940     83,308     70,881  
Net interest expense   30,978     54,929     36,073  
Income before income taxes $ 57,962   $ 28,379   $ 34,808