Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Net revenues	$ 358,476	$ 278,628	$ 760,439	$ 509,409
Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	215,484	189,022	467,056	354,913
Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	62,164	52,376	126,379	90,461
Canada
Disaggregation of Revenue [Line Items]
Net revenues	52,260	13,816	115,092	26,813
Other
Disaggregation of Revenue [Line Items]
Net revenues	28,568	22,866	51,912	36,411
Gaming
Disaggregation of Revenue [Line Items]
Net revenues	261,494	209,184	547,223	382,385
Gaming | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	152,023	145,965	321,364	270,990
Gaming | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	55,804	49,019	113,279	84,661
Gaming | Canada
Disaggregation of Revenue [Line Items]
Net revenues	41,762	12,685	92,010	25,219
Gaming | Other
Disaggregation of Revenue [Line Items]
Net revenues	11,905	1,515	20,570	1,515
Food and beverage
Disaggregation of Revenue [Line Items]
Net revenues	28,916	13,343	60,535	24,383
Food and beverage | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	20,877	12,047	43,654	22,252
Food and beverage | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	3,376	1,132	7,014	1,973
Food and beverage | Canada
Disaggregation of Revenue [Line Items]
Net revenues	3,634	0	7,722	0
Food and beverage | Other
Disaggregation of Revenue [Line Items]
Net revenues	1,029	164	2,145	158
Hotel
Disaggregation of Revenue [Line Items]
Net revenues	24,860	17,170	54,733	33,694
Hotel | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	20,553	16,088	45,444	31,808
Hotel | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	1,367	1,093	2,930	1,897
Hotel | Canada
Disaggregation of Revenue [Line Items]
Net revenues	2,941	0	6,362	0
Hotel | Other
Disaggregation of Revenue [Line Items]
Net revenues	(1)	(11)	(3)	(11)
Retail, entertainment and other
Disaggregation of Revenue [Line Items]
Net revenues	43,206	38,931	97,948	68,947
Retail, entertainment and other | Connecticut
Disaggregation of Revenue [Line Items]
Net revenues	22,031	14,922	56,594	29,863
Retail, entertainment and other | Pennsylvania
Disaggregation of Revenue [Line Items]
Net revenues	1,617	1,132	3,156	1,930
Retail, entertainment and other | Canada
Disaggregation of Revenue [Line Items]
Net revenues	3,923	1,131	8,998	1,594
Retail, entertainment and other | Other
Disaggregation of Revenue [Line Items]
Net revenues	$ 15,635	$ 21,198	$ 29,200	$ 34,749