Fair Value Measurements - Significant Unobservable Inputs for Fair Value Measurements (Details) $ in Millions	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Gaming licenses \| Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, fair value	$ 74.0	$ 101.0
Level 3 \| Gaming licenses \| Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, fair value	$ 74.0	$ 101.0
Level 3 \| Discounted cash flow \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other long-term obligation	0.270
Level 3 \| Discounted cash flow \| Discount rate \| Plainridge Park Casino
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent purchase price - Plainridge Park Casino	0.078
Level 3 \| Discounted cash flow \| Discount rate \| Gaming licenses
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.130	0.130
Level 3 \| Discounted cash flow \| Long-term revenue growth rate \| Trademarks
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.020	0.020

Indefinite-Lived Intangible Asset, Measurement Input

No definition available.

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- Definition

Value of input used to measure contingent consideration liability from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Value of input used to measure long-term debt.

+ References

+ Details

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