Fair Value Measurements - Significant Unobservable Inputs For Level 3 Assets and Liabilities (Details) - Level 3 - Discount rate - Discounted cash flow	Sep. 30, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other long-term obligation, measurement input	0.270
Plainridge Park Casino
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input	0.034

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

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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant