CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statements of Changes in Capital
Total capital at beginning of period	$ (93,602)	$ 145,961	$ (67,989)	$ 137,433
Net income (loss)	(15,973)	(140,031)	(42,734)	(130,607)
Foreign currency translation adjustment	(10,533)	(18,581)	10,444	(7,164)
Distributions to Mohegan Tribe	(12,000)	(12,000)	(24,000)	(24,000)
Distributions to Salishan Company, LLC related to the Cowlitz Project		(100)	(261)	(413)
Other			(7,568)
Total capital at end of period	(132,108)	(24,751)	(132,108)	(24,751)
Retained Earnings (Deficit)
Statements of Changes in Capital
Total capital at beginning of period	(114,574)	134,205	(75,692)	137,124
Net income (loss)	(15,989)	(140,094)	(42,610)	(130,700)
Distributions to Mohegan Tribe	(12,000)	(12,000)	(24,000)	(24,000)
Distributions to Salishan Company, LLC related to the Cowlitz Project		(100)	(261)	(413)
Total capital at end of period	(142,563)	(17,989)	(142,563)	(17,989)
Accumulated Other Comprehensive Income (Loss)
Statements of Changes in Capital
Total capital at beginning of period	19,824	4,253	223	(6,633)
Foreign currency translation adjustment	(10,533)	(17,842)	9,068	(6,956)
Total capital at end of period	9,291	(13,589)	9,291	(13,589)
Total Capital Attributable to Mohegan Tribal Gaming Authority
Statements of Changes in Capital
Total capital at beginning of period	(94,750)	138,458	(75,469)	130,491
Net income (loss)	(15,989)	(140,094)	(42,610)	(130,700)
Foreign currency translation adjustment	(10,533)	(17,842)	9,068	(6,956)
Distributions to Mohegan Tribe	(12,000)	(12,000)	(24,000)	(24,000)
Distributions to Salishan Company, LLC related to the Cowlitz Project		(100)	(261)	(413)
Total capital at end of period	(133,272)	(31,578)	(133,272)	(31,578)
Non-controlling Interests
Statements of Changes in Capital
Total capital at beginning of period	1,148	7,503	7,480	6,942
Net income (loss)	16	63	(124)	93
Foreign currency translation adjustment		(739)	1,376	(208)
Other			(7,568)
Total capital at end of period	$ 1,164	$ 6,827	$ 1,164	$ 6,827