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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
Sep. 24, 2016
Sep. 26, 2015
Property, Plant and Equipment [Line Items]    
Total $ 2,414,375,798 $ 2,300,700,843
Less accumulated depreciation and amortization 1,166,494,025 1,089,242,450
Property and equipment - net 1,247,881,773 1,211,458,393
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total 332,093,281 319,247,363
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Total 34,977,869 15,289,568
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Total 1,058,126,030 1,027,716,672
Store, Office and Warehouse Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 864,032,096 815,624,122
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 71,052,757 68,920,594
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 54,093,765 $ 53,902,524