Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Nov. 04, 2021	Sep. 30, 2021	Sep. 30, 2016
Debt Schedule [Abstract]
Long-term debt, face value	$ 2,522,203
Less: current portion of long-term debt, face value	(47,402)
Long-term debt, net of current portion, face value	2,474,801
Long-term debt	2,351,953		$ 1,938,754
Current portion of long-term debt	(47,402)		(80,276)
Long-term debt, net of current portion	2,304,551		1,858,478
Fair value	2,178,852
Unamortized discounts and debt issuance costs	170,250		34,022
Senior Secured Credit Facility | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	0
Long-term debt	0		27,000
Line of Credit | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	18,000
Long-term debt	$ 18,000		20,227
2021 8% Senior Secured Notes | Senior Notes
Debt Schedule [Abstract]
Interest rate, stated	8.00%
Long-term debt, face value	$ 1,175,000
Long-term debt	1,161,164		1,157,731
2016 7 7/8% Senior Unsecured Notes | Senior Notes
Debt Schedule [Abstract]
Long-term debt, face value	500,000
Long-term debt	$ 495,531		493,599
2016 7 7/8% Senior Unsecured Notes | Senior Unsecured Notes
Debt Schedule [Abstract]
Interest rate, stated	7.875%			7.875%
Long-term debt, face value				$ 500,000
Niagara Credit Facility - Revolving | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	$ 0
Long-term debt	0		27,534
Niagara Credit Facility - Swingline | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	0
Long-term debt	0		4,333
Niagara Credit Facility - Term Loan | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	60,945
Long-term debt	60,453		68,965
Niagara Convertible Debenture | Convertible Debenture
Debt Schedule [Abstract]
Long-term debt, face value	29,108
Long-term debt	29,108		31,468
Inspire Korea Credit Facility | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	362,455
Long-term debt	315,475		0
Korea Term Loan
Debt Schedule [Abstract]
Interest rate, stated		17.00%
Korea Term Loan | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	311,998
Long-term debt	211,425		0
Mohegan Expo Credit Facility | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	0
Long-term debt	0		25,697
BIA Loan Guaranty Program (Guaranteed Credit Facility) | Credit Facility
Debt Schedule [Abstract]
Long-term debt, face value	25,156
Long-term debt	24,875		27,208
Redemption note payable | Redemption Note Payable
Debt Schedule [Abstract]
Long-term debt, face value	38,880
Long-term debt	35,261		53,130
Other | Senior Unsecured Notes
Debt Schedule [Abstract]
Long-term debt, face value	661
Long-term debt	$ 661		$ 1,862