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Segment Information (Operations By Lines Of Business) (Details) - USD ($)
 3 Months Ended
Dec. 24, 2016
Dec. 26, 2015
Sep. 24, 2016
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers $ 982,758,339 $ 951,113,863  
Total income from operations 32,166,383 31,630,776  
Total assets 1,724,690,441   $ 1,686,478,299
Elimination of intercompany receivable      
Segment Reporting Information By Segment [Line Items]      
Total assets (1,997,000)   (2,415,000)
Grocery      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 360,901,000 358,463,000  
Non-foods      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 212,311,000 202,868,000  
Perishables      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 255,849,000 246,885,000  
Gasoline      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 118,523,000 108,515,000  
Retail      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 947,584,000 916,731,000  
Total income from operations 28,991,000 27,769,000  
Total assets 1,591,322,000   1,555,319,000
Other [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 35,174,000 34,383,000  
Total income from operations 3,175,000 $ 3,862,000  
Total assets $ 135,365,000   $ 133,574,000