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Leases (Narrative) (Details)
 3 Months Ended 9 Months Ended
Jun. 26, 2021
USD ($)
Jun. 26, 2021
USD ($)
item
Sep. 26, 2020
USD ($)
Leases [Line Items]      
Initial terms of leases 20 years 20 years  
Operating lease cost $ 2,700,000 $ 8,400,000  
Right of use assets 42,161,910 42,161,910 $ 46,590,718
Noncurrent operating lease liabilities $ 36,076,971 $ 36,076,971 $ 40,962,735
Weighted average remaining lease term 12 years 10 months 24 days 12 years 10 months 24 days  
Operating lease weighted average discount rate 3.51% 3.51%  
Lessor non-cancelable operating lease agreements 20 years 20 years  
Number of shopping centers owned and operated | item   84  
Lease Extensions [Member]      
Leases [Line Items]      
Right of use assets $ 1,600,000 $ 1,600,000  
Noncurrent operating lease liabilities $ 1,600,000 $ 1,600,000