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Document And Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2017
Dec. 04, 2017
Mar. 25, 2017
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Trading Symbol IMKTA    
Entity Registrant Name INGLES MARKETS INC    
Entity Central Index Key 0000050493    
Current Fiscal Year End Date --09-30    
Entity Filer Category Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 619,000,000
Class A Common Stock [Member]      
Entity Common Stock, Shares Outstanding   14,114,044  
Class B Common Stock [Member]      
Entity Common Stock, Shares Outstanding   6,145,732