Leases - Cost and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Lessee, Lease, Description [Line Items]
Property and equipment, at cost	$ 3,206,660	$ 3,015,669
Accumulated depreciation	(1,562,870)	(1,484,050)
Property and equipment, net	1,643,790	1,531,619
Mohegan Sun
Lessee, Lease, Description [Line Items]
Property and equipment, at cost	487,180	491,673
Accumulated depreciation	(233,344)	(218,873)
Property and equipment, net	$ 253,836	$ 272,800