Intangible Assets - Schedule of Other Current Assets and Other Current Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 318,635	$ 334,925
Accumulated amortization	(7,109)	(7,670)
Intangible assets, net	311,526	327,255
Mohegan Sun trademark
Finite-Lived Intangible Assets [Line Items]
Other indefinite-lived intangible assets	119,692	119,692
Mohegan Pennsylvania gaming licenses
Finite-Lived Intangible Assets [Line Items]
Other indefinite-lived intangible assets	171,904	171,904
Niagara Resorts Casino Operating and Services Agreement rights
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 16,291	17,612
Useful life	21 years
Other
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 10,748	$ 25,717