CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statements of Changes in Capital
Total capital at beginning of period	$ (132,108)	$ (24,751)	$ (67,989)	$ 137,433
Net income (loss)	25,902	(49,929)	(16,832)	(180,536)
Foreign currency translation adjustment	216	6,088	10,660	(1,076)
Contribution from Mohegan Tribe	2,814		2,814
Distributions to Mohegan Tribe	(15,000)	(8,333)	(39,000)	(32,333)
Distributions to Salishan Company, LLC related to the Cowlitz Project	(159)	(248)	(420)	(661)
Other			(7,568)
Total capital at end of period	(118,335)	(77,173)	(118,335)	(77,173)
Retained Earnings (Deficit)
Statements of Changes in Capital
Total capital at beginning of period	(142,563)	(17,989)	(75,692)	137,124
Net income (loss)	25,367	(50,045)	(17,243)	(180,745)
Distributions to Mohegan Tribe	(12,186)	(8,333)	(36,186)	(32,333)
Distributions to Salishan Company, LLC related to the Cowlitz Project	(159)	(248)	(420)	(661)
Total capital at end of period	(129,541)	(76,615)	(129,541)	(76,615)
Additional Paid-in Capital
Statements of Changes in Capital
Total capital at beginning of period	0	0	0	0
Contribution from Mohegan Tribe	2,814		2,814
Distributions to Mohegan Tribe	(2,814)		(2,814)
Total capital at end of period	0	0	0	0
Accumulated Other Comprehensive Income (Loss)
Statements of Changes in Capital
Total capital at beginning of period	9,291	(13,589)	223	(6,633)
Foreign currency translation adjustment	216	5,859	9,284	(1,097)
Total capital at end of period	9,507	(7,730)	9,507	(7,730)
Total Capital Attributable to Mohegan Tribal Gaming Authority
Statements of Changes in Capital
Total capital at beginning of period	(133,272)	(31,578)	(75,469)	130,491
Net income (loss)	25,367	(50,045)	(17,243)	(180,745)
Foreign currency translation adjustment	216	5,859	9,284	(1,097)
Contribution from Mohegan Tribe	2,814		2,814
Distributions to Mohegan Tribe	(15,000)	(8,333)	(39,000)	(32,333)
Distributions to Salishan Company, LLC related to the Cowlitz Project	(159)	(248)	(420)	(661)
Total capital at end of period	(120,034)	(84,345)	(120,034)	(84,345)
Non-controlling Interests
Statements of Changes in Capital
Total capital at beginning of period	1,164	6,827	7,480	6,942
Net income (loss)	535	116	411	209
Foreign currency translation adjustment		229	1,376	21
Other			(7,568)
Total capital at end of period	$ 1,699	$ 7,172	$ 1,699	$ 7,172