Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 401,963	$ 230,781
Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	251,572	165,891
Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	64,215	38,085
Canada
Disaggregation of Revenue [Line Items]
Net revenues	62,832	12,997
Other
Disaggregation of Revenue [Line Items]
Net revenues	23,344	13,545
Gaming
Disaggregation of Revenue [Line Items]
Net revenues	285,729	173,201
Gaming | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	169,341	125,025
Gaming | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	57,475	35,642
Gaming | Canada
Disaggregation of Revenue [Line Items]
Net revenues	50,248	12,534
Gaming | Other
Disaggregation of Revenue [Line Items]
Net revenues	8,665	0
Food and beverage
Disaggregation of Revenue [Line Items]
Net revenues	31,619	11,040
Food and beverage | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	22,777	10,205
Food and beverage | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	3,638	841
Food and beverage | Canada
Disaggregation of Revenue [Line Items]
Net revenues	4,088	0
Food and beverage | Other
Disaggregation of Revenue [Line Items]
Net revenues	1,116	(6)
Hotel
Disaggregation of Revenue [Line Items]
Net revenues	29,873	16,524
Hotel | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	24,891	15,720
Hotel | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	1,563	804
Hotel | Canada
Disaggregation of Revenue [Line Items]
Net revenues	3,421	0
Hotel | Other
Disaggregation of Revenue [Line Items]
Net revenues	(2)	0
Retail, entertainment and other
Disaggregation of Revenue [Line Items]
Net revenues	54,742	30,016
Retail, entertainment and other | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	34,563	14,941
Retail, entertainment and other | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	1,539	798
Retail, entertainment and other | Canada
Disaggregation of Revenue [Line Items]
Net revenues	5,075	463
Retail, entertainment and other | Other
Disaggregation of Revenue [Line Items]
Net revenues	$ 13,565	$ 13,551