SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL STATEMENT INFORMATION - STATEMENTS OF INCOME (Details) - USD ($) $ in Thousands		3 Months Ended					9 Months Ended				12 Months Ended
		Jun. 30, 2015		Mar. 31, 2015	Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Sep. 30, 2014	Sep. 30, 2010
Revenues:
Gaming		$ 284,713			$ 284,801		$ 837,463		$ 837,954
Food and beverage		23,021			23,273		66,811		68,605
Hotel		12,700			12,160		37,199		34,763
Retail, entertainment and other		29,825			31,542		82,231		87,065
Gross revenues		350,259			351,776		1,023,704		1,028,387
Less-Promotional allowances		(25,220)			(25,440)		(71,510)		(72,545)
Net revenues		325,039			326,336		952,194		955,842
Operating costs and expenses:
Gaming		164,229			171,533		485,994		513,574
Food and beverage		10,323			10,359		31,363		31,207
Hotel		3,788			3,950		10,767		11,744
Retail, entertainment and other		12,447			13,318		34,268		37,446
Advertising, general and administrative		46,522			48,929		140,946		143,740
Corporate		7,119			9,259		23,400		29,551
Depreciation and amortization		19,086			20,070		58,703		60,067
(Gain) loss on disposition of assets		26			(64)		845		(12)
Severance		0			0		3,370		0
Impairment of Project Horizon		0		$ 2,500	0		2,502		0		$ 5,000	$ 58,100
Relinquishment liability reassessment		0			0		(243)		0
Pre-opening		0			0		0		1,187
Total operating costs and expenses		263,540			277,354		791,915		828,504
Income from operations		61,499			48,982		160,279		127,338
Other income (expense):
Accretion of discount to the relinquishment liability		0			(552)		(227)		(1,654)
Interest income		1,906			1,701		5,554		4,947
Interest expense, net of capitalized interest		(35,660)			(36,426)		(107,692)		(111,692)
Loss on early extinguishment of debt		0			(2)		0		(62,277)
Loss on interests in subsidiaries		0			0		0		0
Other income (expense), net		(50)			59		(1,260)		(819)
Total other expense		(33,804)			(35,220)		(103,625)		(171,495)
Net income (loss)		27,695			13,762		56,654		(44,157)
Loss attributable to non-controlling interests		439			130		1,278		421
Net income (loss) attributable to Mohegan Tribal Gaming Authority		28,134			13,892		57,932		(43,736)
Authority
Revenues:
Gaming		213,199			213,600		635,777		632,604
Food and beverage		15,378			15,512		45,708		46,881
Hotel		11,222			10,855		33,141		31,870
Retail, entertainment and other		24,556			24,888		71,169		75,835
Gross revenues		264,355			264,855		785,795		787,190
Less-Promotional allowances		(19,386)			(18,959)		(55,536)		(56,186)
Net revenues		244,969			245,896		730,259		731,004
Operating costs and expenses:
Gaming		113,712			120,236		341,772		364,858
Food and beverage		7,981			7,921		25,191		24,660
Hotel		3,517			3,809		10,248		11,435
Retail, entertainment and other		10,475			11,961		29,322		34,149
Advertising, general and administrative		37,970			39,261		116,711		117,579
Corporate		3,269			3,598		12,471		10,071
Depreciation and amortization		15,496			16,397		47,739		49,091
(Gain) loss on disposition of assets		26			(66)		843		(15)
Severance							3,244
Impairment of Project Horizon							2,502
Relinquishment liability reassessment							(243)
Pre-opening									0
Total operating costs and expenses		192,446			203,117		589,800		611,828
Income from operations		52,523			42,779		140,459		119,176
Other income (expense):
Accretion of discount to the relinquishment liability					(552)		(227)		(1,654)
Interest income		10			20		32		65
Interest expense, net of capitalized interest		(23,563)			(23,953)		(71,260)		(73,242)
Loss on early extinguishment of debt					(2)				(62,277)
Loss on interests in subsidiaries		(832)			(4,426)		(11,079)		(25,945)
Other income (expense), net		(4)			26		7		141
Total other expense		(24,389)			(28,887)		(82,527)		(162,912)
Net income (loss)		28,134			13,892		57,932		(43,736)
Loss attributable to non-controlling interests		0			0		0		0
Net income (loss) attributable to Mohegan Tribal Gaming Authority		28,134			13,892		57,932		(43,736)
Total Guarantor Subsidiaries
Revenues:
Gaming		71,514	[1]		71,201	[2]	201,686	[3]	205,350	[4]
Food and beverage		7,615	[1]		7,761	[2]	20,983	[3]	21,724	[4]
Hotel		1,478	[1]		1,305	[2]	4,058	[3]	2,893	[4]
Retail, entertainment and other		4,716	[1]		6,359	[2]	9,167	[3]	10,484	[4]
Gross revenues		85,323	[1]		86,626	[2]	235,894	[3]	240,451	[4]
Less-Promotional allowances		(5,095)	[1]		(5,500)	[2]	(14,892)	[3]	(15,367)	[4]
Net revenues		80,228	[1]		81,126	[2]	221,002	[3]	225,084	[4]
Operating costs and expenses:
Gaming		50,517	[1]		51,297	[2]	144,222	[3]	148,716	[4]
Food and beverage		2,342	[1]		2,438	[2]	6,172	[3]	6,547	[4]
Hotel		1,484	[1]		1,354	[2]	4,158	[3]	3,207	[4]
Retail, entertainment and other		2,027	[1]		2,309	[2]	3,653	[3]	4,251	[4]
Advertising, general and administrative		8,809	[1]		9,709	[2]	24,698	[3]	26,240	[4]
Corporate		0	[1]		0	[2]	0	[3]	0	[4]
Depreciation and amortization		3,306	[1]		3,420	[2]	10,113	[3],[5]	10,318	[4],[6]
(Gain) loss on disposition of assets		0	[1]		2	[2]	2	[3]	3	[4]
Severance	[3]						126
Impairment of Project Horizon	[3]						0
Relinquishment liability reassessment	[3]						0
Pre-opening	[4]								1,187
Total operating costs and expenses		68,485	[1]		70,529	[2]	193,144	[3]	200,469	[4]
Income from operations		11,743	[1]		10,597	[2]	27,858	[3]	24,615	[4]
Other income (expense):
Accretion of discount to the relinquishment liability					0	[2]	0	[3],[5]	0	[4],[6]
Interest income		1,663	[1]		1,300	[2]	4,636	[3]	3,397	[4]
Interest expense, net of capitalized interest		(9,956)	[1]		(10,392)	[2]	(30,055)	[3]	(32,597)	[4]
Loss on early extinguishment of debt					0	[2]			0	[4]
Loss on interests in subsidiaries		(1,819)	[1]		(5,022)	[2]	(6,760)	[3]	(17,439)	[4]
Other income (expense), net		0	[1]		0	[2]	0	[3]	0	[4]
Total other expense		(10,112)	[1]		(14,114)	[2]	(32,179)	[3]	(46,639)	[4]
Net income (loss)		1,631	[1]		(3,517)	[2]	(4,321)	[3],[5]	(22,024)	[4],[6]
Loss attributable to non-controlling interests		0	[1]		0	[2]	0	[3]	0	[4]
Net income (loss) attributable to Mohegan Tribal Gaming Authority		1,631	[1]		(3,517)	[2]	(4,321)	[3]	(22,024)	[4]
Total Non-Guarantor Subsidiaries and Entities
Revenues:
Gaming		0	[7]		0	[8]	0	[9]	0	[10]
Food and beverage		28	[7]		0	[8]	120	[9]	0	[10]
Hotel		0	[7]		0	[8]	0	[9]	0	[10]
Retail, entertainment and other		1,826	[7]		1,568	[8]	5,714	[9]	3,824	[10]
Gross revenues		1,854	[7]		1,568	[8]	5,834	[9]	3,824	[10]
Less-Promotional allowances		(6)	[7]		(6)	[8]	(9)	[9]	(15)	[10]
Net revenues		1,848	[7]		1,562	[8]	5,825	[9]	3,809	[10]
Operating costs and expenses:
Gaming		0	[7]		0	[8]	0	[9]	0	[10]
Food and beverage		0	[7]		0	[8]	0	[9]	0	[10]
Hotel		0	[7]		0	[8]	0	[9]	0	[10]
Retail, entertainment and other		678	[7]		0	[8]	2,366	[9]	0	[10]
Advertising, general and administrative		3,653	[7]		5,703	[8]	10,646	[9]	19,604	[10]
Corporate		0	[7]		0	[8]	0	[9]	0	[10]
Depreciation and amortization		284	[7]		253	[8]	851	[9],[11]	658	[10],[12]
(Gain) loss on disposition of assets		0	[7]		0	[8]	0	[9]	0	[10]
Severance	[9]						0
Impairment of Project Horizon							0
Relinquishment liability reassessment	[11]						0
Pre-opening	[10]								0
Total operating costs and expenses		4,615	[7]		5,956	[8]	13,863	[9]	20,262	[10]
Income from operations		(2,767)	[7]		(4,394)	[8]	(8,038)	[9]	(16,453)	[10]
Other income (expense):
Accretion of discount to the relinquishment liability					0	[8]	0	[9],[11]	0	[10],[12]
Interest income		1,961	[7]		1,763	[8]	5,813	[9]	5,100	[10]
Interest expense, net of capitalized interest		(3,869)	[7]		(3,463)	[8]	(11,304)	[9]	(9,468)	[10]
Loss on early extinguishment of debt					0	[8]			0	[10]
Loss on interests in subsidiaries		0	[7]		0	[8]	0	[9]	0	[10]
Other income (expense), net		(46)	[7]		33	[8]	(1,267)	[9]	(960)	[10]
Total other expense		(1,954)	[7]		(1,667)	[8]	(6,758)	[9]	(5,328)	[10]
Net income (loss)		(4,721)	[7]		(6,061)	[8]	(14,796)	[9],[11]	(21,781)	[10],[12]
Loss attributable to non-controlling interests		217	[7]		0	[8]	677	[9]	0	[10]
Net income (loss) attributable to Mohegan Tribal Gaming Authority		(4,504)	[7]		(6,061)	[8]	(14,119)	[9]	(21,781)	[10]
Consolidating/Eliminating Adjustments
Revenues:
Gaming		0			0		0		0
Food and beverage		0			0		0		0
Hotel		0			0		0		0
Retail, entertainment and other		(1,273)			(1,273)		(3,819)		(3,078)
Gross revenues		(1,273)			(1,273)		(3,819)		(3,078)
Less-Promotional allowances		(733)			(975)		(1,073)		(977)
Net revenues		(2,006)			(2,248)		(4,892)		(4,055)
Operating costs and expenses:
Gaming		0			0		0		0
Food and beverage		0			0		0		0
Hotel		(1,213)			(1,213)		(3,639)		(2,898)
Retail, entertainment and other		(733)			(952)		(1,073)		(954)
Advertising, general and administrative		(3,910)			(5,744)		(11,109)		(19,683)
Corporate		3,850			$ 5,661		10,929		19,480
Depreciation and amortization		0					0		0
(Gain) loss on disposition of assets		0					0		0
Severance							0
Impairment of Project Horizon							0
Relinquishment liability reassessment							0
Pre-opening									0
Total operating costs and expenses		(2,006)			$ (2,248)		(4,892)		(4,055)
Income from operations		0			0		0		0
Other income (expense):
Accretion of discount to the relinquishment liability					0		0		0
Interest income		(1,728)			(1,382)		(4,927)		(3,615)
Interest expense, net of capitalized interest		1,728			1,382		4,927		3,615
Loss on early extinguishment of debt					0				0
Loss on interests in subsidiaries		2,651			9,448		17,839		43,384
Other income (expense), net		0			0		0		0
Total other expense		2,651			9,448		17,839		43,384
Net income (loss)		2,651			9,448		17,839		43,384
Loss attributable to non-controlling interests		222			130		601		421
Net income (loss) attributable to Mohegan Tribal Gaming Authority		$ 2,873			$ 9,578		$ 18,440		$ 43,805

[1] Includes the Pocono Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.

[2] Includes the Pocono Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.

[3] Includes the Pocono Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.

[4] Includes the Pocono Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.

[5] Includes the Pocono Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.

[6] Includes the Pocono Subsidiaries, MBC, Mohegan Golf, Mohegan Ventures-NW, MVW, WTG and MTGA Gaming.

[7] Includes Mohegan Lacrosse, MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.

[8] Includes MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.

[9] Includes Mohegan Lacrosse, MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.

[10] Includes MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.

[11] Includes Mohegan Lacrosse, MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.

[12] Includes MGA and subsidiaries, Downs Lodging, Salishan-Mohegan, MG&H and Mohegan Resorts and subsidiaries.