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Operations by Lines of Business (Detail) (USD $)
 3 Months Ended 6 Months Ended
Mar. 30, 2013
Mar. 24, 2012
Mar. 30, 2013
Mar. 24, 2012
Sep. 29, 2012
Revenues from unaffiliated customers:          
Net sales $ 918,638,125 $ 881,667,028 $ 1,851,429,558 $ 1,799,904,957  
Total revenues from unaffiliated customers 920,694,000 883,803,000 1,855,672,000 1,804,334,000  
Income from operations:          
Total income from operations 27,721,800 23,841,099 61,202,806 54,203,604  
Assets:          
Total assets 1,653,138,154   1,653,138,154   1,642,108,604
Grocery sales
          
Revenues from unaffiliated customers:          
Net sales 886,374,000 848,756,000 1,786,170,000 1,733,529,000  
Income from operations:          
Total income from operations 24,415,000 20,821,000 55,256,000 47,909,000  
Shopping center rentals
          
Revenues from unaffiliated customers:          
Net sales 2,056,000 2,136,000 4,242,000 4,429,000  
Income from operations:          
Total income from operations 318,000 368,000 634,000 796,000  
Assets:          
Total assets 116,050,000   116,050,000   119,393,000
Fluid dairy
          
Revenues from unaffiliated customers:          
Net sales 32,264,000 32,911,000 65,260,000 66,376,000  
Income from operations:          
Total income from operations 2,989,000 2,652,000 5,313,000 5,499,000  
Assets:          
Total assets 37,125,000   37,125,000   38,874,000
Grocery
          
Revenues from unaffiliated customers:          
Net sales 359,466,000 346,674,000 730,727,000 718,635,000  
Assets:          
Total assets 1,502,136,000   1,502,136,000   1,486,109,000
Elimination of intercompany receivable
          
Assets:          
Total assets $ (2,173,000)   $ (2,173,000)   $ (2,267,000)