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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
Sep. 29, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]    
Total $ 2,613,037,487 $ 2,506,813,903
Less accumulated depreciation and amortization 1,309,993,117 1,241,701,553
Property and equipment - net 1,303,044,370 1,265,112,350
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total 351,073,344 339,983,697
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Total 12,393,293 26,684,306
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Total 1,173,237,017 1,110,482,379
Store, Office and Warehouse Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 946,026,834 900,160,007
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 75,919,047 72,942,078
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 54,387,952 $ 56,561,436