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Segment Information (Operations By Lines Of Business) (Details) - USD ($)
 3 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Sep. 26, 2020
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers $ 1,190,443,141 $ 1,078,354,937  
Total income from operations 76,440,784 38,475,361  
Total assets 1,928,500,293   $ 1,899,298,902
Elimination of intercompany receivable      
Segment Reporting Information By Segment [Line Items]      
Total assets (2,133,000)   (2,511,000)
Grocery [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 442,121,000 378,329,000  
Non-foods [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 279,688,000 246,030,000  
Perishables [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 321,263,000 280,805,000  
Gasoline [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 110,469,000 139,112,000  
Retail [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 1,153,541,000 1,044,276,000  
Total income from operations 71,519,000 34,221,000  
Total assets 1,737,607,000   1,712,203,000
Other Segment [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 36,902,000 34,079,000  
Total income from operations 4,922,000 $ 4,254,000  
Total assets $ 193,026,000   $ 189,607,000