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Leases (Narrative) (Details)	3 Months Ended	6 Months Ended
	Mar. 26, 2022 USD ($)	Mar. 26, 2022 USD ($) item	Sep. 25, 2021 USD ($)
Operating Leased Assets [Line Items]
Initial terms of leases	20 years	20 years
Operating lease cost	$ 3,000,000.0	$ 5,600,000
Number of shopping centers owned and operated | item		83
Lessor non-cancelable operating lease agreements	20 years	20 years
Weighted average remaining lease term	12 years 8 months 12 days	12 years 8 months 12 days
Weighted average discount rate	3.51%	3.51%
Operating Lease, Liability, Noncurrent	$ 35,461,720	$ 35,461,720	$ 33,887,935
Lease Extensions [Member]
Operating Leased Assets [Line Items]
Operating Lease, Liability, Noncurrent	$ 5,000,000.0	$ 5,000,000.0

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- Definition

Number Of Shopping Centers Owned And Operated

+ References

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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