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Leases (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2020
USD ($)
Jun. 27, 2020
USD ($)
Sep. 28, 2019
item
Leases [Line Items]      
Initial terms of leases 20 years 20 years  
Operating lease cost $ 2,400,000 $ 7,300,000  
Operating lease right of use assets 45,857,261 45,857,261  
Noncurrent operating lease liabilities $ 40,560,520 $ 40,560,520  
Weighted average remaining lease term 13 years 1 month 6 days 13 years 1 month 6 days  
Operating lease weighted average discount rate 3.51% 3.51%  
Lessor non-cancelable operating lease agreements     20 years
Number of shopping centers owned and operated | item     79
Lease Extensions [Member]      
Leases [Line Items]      
Operating lease right of use assets $ 8,000,000.0 $ 8,000,000.0  
Noncurrent operating lease liabilities $ 8,000,000.0 $ 8,000,000.0