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Valuation And Qualifying Accounts
 12 Months Ended
Aug. 31, 2012
Valuation And Qualifying Accounts [Abstract]  
Valuation And Qualifying Accounts

Sonic Corp.

Schedule II – Valuation and Qualifying Accounts

Description Balance at
Beginning of
Year		 Additions
Charged to
Costs and
Expenses		 Amounts
Written Off
Against the
Allowance		 (Transfer)
Recoveries		 Balance
at End
of Year
  (In Thousands)
 
Allowance for doubtful
accounts and notes
receivable		                  
Years ended:                  
August 31, 2012 $ 3,366 764 (1,152 ) 14   $ 2,992
August 31, 2011   3,210 1,462 (1,337 ) 31     3,366
August 31, 2010 $ 879 2,460 (139 ) 10   $ 3,210
 
Accrued carrying costs
for drive-in closings
and disposals		                  
Years ended:                  
August 31, 2012 $ 421 366 (219 ) –   $ 568
August 31, 2011   47 575 (150 ) (51 )   421
August 31, 2010 $ 46 – –   1   $ 47