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Segment Information (Operations By Lines Of Business) (Details) - USD ($)
 3 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Sep. 25, 2021
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers $ 1,391,529,510 $ 1,190,443,141  
Total income from operations 90,402,834 76,440,784  
Total assets 2,077,997,703   $ 2,018,343,955
Elimination of intercompany receivable [Member]      
Segment Reporting Information By Segment [Line Items]      
Total assets (2,041,000)   (2,578,000)
Grocery [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 488,407,000 442,121,000  
Non-foods [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 304,672,000 279,688,000  
Perishables [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 364,350,000 321,263,000  
Gasoline [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 190,832,000 110,469,000  
Retail Segment [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 1,348,261,000 1,153,541,000  
Total income from operations 85,499,000 71,519,000  
Total assets 1,847,898,000   1,794,160,000
Other Segment [Member]      
Segment Reporting Information By Segment [Line Items]      
Total revenues from unaffiliated customers 43,269,000 36,902,000  
Total income from operations 4,904,000 $ 4,922,000  
Total assets $ 232,141,000   $ 226,762,000