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Leases (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 28, 2020 USD ($)	Mar. 28, 2020 USD ($)	Sep. 28, 2019 item
Leases [Abstract]
Initial terms of leases	20 years	20 years
Operating lease cost	$ 2.3	$ 5.0
Operating sub-lease rental income		$ 0.2
Weighted average remaining lease term	14 years 3 months 18 days	14 years 3 months 18 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

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Number Of Shopping Centers Owned And Operated

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

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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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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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The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

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