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Segment Information (Operations By Lines Of Business) (Details) (USD $)
3 Months Ended 9 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Sep. 28, 2013
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers $ 978,262,000 $ 934,015,000 $ 2,871,147,000 $ 2,789,687,000  
Total income from operations 33,360,362 32,902,957 87,365,349 94,105,763  
Total assets 1,654,305,604   1,654,305,604   1,669,327,737
Elimination Of Intercompany Receivable [Member]
         
Segment Reporting Information By Segment [Line Items]          
Total assets (2,182,000)   (2,182,000)   (2,392,000)
Grocery Sales [Member]
         
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 938,386,000 899,535,000 2,756,920,000 2,685,705,000  
Total income from operations 30,229,000 29,960,000 78,678,000 85,215,000  
Total assets 1,285,696,000   1,285,696,000   1,528,483,000
Other Segment [Member]
         
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 39,876,000 34,480,000 114,227,000 103,982,000  
Total income from operations 3,131,000 2,943,000 8,687,000 8,891,000  
Total assets $ 370,790,000   $ 370,790,000   $ 143,237,000