Summary of Significant Accounting Policies - Goodwill (Details) $ in Millions		3 Months Ended	6 Months Ended
Apr. 02, 2021 reportingUnit	Mar. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Goodwill [Line Items]
Number of reporting units \| reportingUnit	2
Kansas Properties
Goodwill [Line Items]
Disposal group, fair value		$ 3.5	$ 3.5
Goodwill impairment		$ 18.5	$ 18.5

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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