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Document And Entity Information
6 Months Ended
Feb. 28, 2014
Mar. 31, 2014
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Feb. 28, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q2  
Entity Registrant Name SONIC CORP.  
Entity Central Index Key 0000868611  
Current Fiscal Year End Date --08-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   54,349,291
Entity Well-known Seasoned Issuer Yes  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No