CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Oct. 01, 2018
Statements of Changes in Capital
Total capital at beginning of period	$ 188,727	$ 351,798	$ 270,794	$ 309,169
Cumulative-effect adjustment for the adoption of ASC 606 Revenue from Contracts with Customers					$ (41,575)
Net income (loss)	19,877	34,815	18,301	91,924
Foreign currency translation adjustment	(4,041)	(6,750)	(8,346)	9,457
Share redemption related to Project Inspire		(106,702)		(112,849)
Distributions to Mohegan Tribe	(15,000)	(15,000)	(39,000)	(39,000)
Distributions to Mohegan Tribe related to the Cowlitz Project		(5,956)	(730)	(6,496)
Redemption of Mohegan Tribe membership interest in the Cowlitz Project			(10,000)
Redemption of membership interest related to the New England Black Wolves franchise			75
Other	0	0	44	0
Total capital at end of period	189,563	252,205	189,563	252,205
Retained Earnings
Statements of Changes in Capital
Total capital at beginning of period	174,053	229,922	250,707	196,645
Cumulative-effect adjustment for the adoption of ASC 606 Revenue from Contracts with Customers					(41,575)
Net income (loss)	19,839	35,008	18,103	92,825
Share redemption related to Project Inspire		(9,996)		(9,996)
Distributions to Mohegan Tribe	(15,000)	(15,000)	(39,000)	(39,000)
Distributions to Mohegan Tribe related to the Cowlitz Project		(5,956)	(730)	(6,496)
Redemption of Mohegan Tribe membership interest in the Cowlitz Project			(4,114)
Redemption of membership interest related to the New England Black Wolves franchise			(4,499)
Total capital at end of period	178,892	233,978	178,892	233,978
Accumulated Other Comprehensive Income (Loss)
Statements of Changes in Capital
Total capital at beginning of period	7,016	8,306	11,062	1,125
Foreign currency translation adjustment	(3,810)	(5,093)	(7,900)	2,088
Share redemption related to Project Inspire		7,949		7,949
Other			44
Total capital at end of period	3,206	11,162	3,206	11,162
Total Capital Attributable to Mohegan Tribal Gaming Authority
Statements of Changes in Capital
Total capital at beginning of period	181,069	238,228	261,769	197,770
Cumulative-effect adjustment for the adoption of ASC 606 Revenue from Contracts with Customers					$ (41,575)
Net income (loss)	19,839	35,008	18,103	92,825
Foreign currency translation adjustment	(3,810)	(5,093)	(7,900)	2,088
Share redemption related to Project Inspire		(2,047)		(2,047)
Distributions to Mohegan Tribe	(15,000)	(15,000)	(39,000)	(39,000)
Distributions to Mohegan Tribe related to the Cowlitz Project		(5,956)	(730)	(6,496)
Redemption of Mohegan Tribe membership interest in the Cowlitz Project			(4,114)
Redemption of membership interest related to the New England Black Wolves franchise			(4,499)
Other			44
Total capital at end of period	182,098	245,140	182,098	245,140
Non-controlling Interests
Statements of Changes in Capital
Total capital at beginning of period	7,658	113,570	9,025	111,399
Net income (loss)	38	(193)	198	(901)
Foreign currency translation adjustment	(231)	(1,657)	(446)	7,369
Share redemption related to Project Inspire		(104,655)		(110,802)
Redemption of Mohegan Tribe membership interest in the Cowlitz Project			(5,886)
Redemption of membership interest related to the New England Black Wolves franchise			4,574
Total capital at end of period	$ 7,465	$ 7,065	$ 7,465	$ 7,065