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Segment Information (Operations By Lines Of Business) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 25, 2017
Mar. 26, 2016
Mar. 25, 2017
Mar. 26, 2016
Sep. 24, 2016
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers $ 946,151,967 $ 924,312,049 $ 1,928,910,306 $ 1,875,425,912  
Total income from operations 25,051,912 33,127,646 57,218,295 64,758,423  
Total assets 1,703,193,011   1,703,193,011   $ 1,686,478,299
Elimination of intercompany receivable          
Segment Reporting Information By Segment [Line Items]          
Total assets (1,669,000)   (1,669,000)   (2,415,000)
Grocery          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 342,188,000 351,123,000 703,089,000 709,585,000  
Non-foods          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 201,258,000 198,158,000 413,568,000 401,026,000  
Perishables          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 248,673,000 248,343,000 504,522,000 495,227,000  
Gasoline          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 118,083,000 92,187,000 236,606,000 200,704,000  
Retail          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 910,202,000 889,811,000 1,857,785,000 1,806,542,000  
Total income from operations 20,606,000 28,869,000 49,597,000 56,638,000  
Total assets 1,570,727,000   1,570,727,000   1,555,319,000
Other Segment [Member]          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 35,950,000 34,501,000 71,125,000 68,884,000  
Total income from operations 4,446,000 $ 4,259,000 7,621,000 $ 8,120,000  
Total assets $ 134,135,000   $ 134,135,000   $ 133,574,000