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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
Sep. 30, 2017
Sep. 24, 2016
Property, Plant and Equipment [Line Items]    
Total $ 2,506,813,903 $ 2,414,375,798
Less accumulated depreciation and amortization 1,241,701,553 1,166,494,025
Property and equipment - net 1,265,112,350 1,247,881,773
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total 339,983,697 332,093,281
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Total 26,684,306 34,977,869
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Total 1,110,482,379 1,058,126,030
Store, Office and Warehouse Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 900,160,007 864,032,096
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 72,942,078 71,052,757
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 56,561,436 $ 54,093,765