SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL STATEMENT INFORMATION - STATEMENTS OF INCOME (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended				12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2015		Mar. 31, 2014		Sep. 30, 2014	Sep. 30, 2010
Revenues:
Gaming	$ 275,016		$ 278,400		$ 552,750		$ 553,153
Food and beverage	21,119		22,613		43,790		45,332
Hotel	12,273		11,911		24,499		22,603
Retail, entertainment and other	24,107		26,018		52,406		55,523
Gross revenues	332,515		338,942		673,445		676,611
Less-Promotional allowances	(22,092)		(22,259)		(46,290)		(47,105)
Net revenues	310,423		316,683		627,155		629,506
Operating costs and expenses:
Gaming	155,666		165,739		321,765		342,041
Food and beverage	10,229		10,749		21,040		20,848
Hotel	3,476		4,074		6,979		7,794
Retail, entertainment and other	9,577		11,352		21,821		24,128
Advertising, general and administrative	48,609		47,869		94,424		94,811
Corporate	8,642		10,860		16,281		20,292
Depreciation and amortization	19,564		20,879		39,617		39,997
Loss on disposition of assets	80		53		819		52
Severance	3,370		0		3,370		0
Impairment of Project Horizon	2,502		0		2,502		0		5,000	58,100
Relinquishment liability reassessment	(299)		0		(243)		0
Pre-opening	0		25		0		1,187
Total operating costs and expenses	261,416		271,600		528,375		551,150
Income from operations	49,007		45,083		98,780		78,356
Other income (expense):
Accretion of discount to the relinquishment liability	0		(551)		(227)		(1,102)
Interest income	1,814		1,602		3,648		3,246
Interest expense, net of capitalized interest	(35,777)		(36,297)		(72,032)		(75,266)
Loss on early extinguishment of debt	0		(192)		0		(62,275)
Loss on interests in subsidiaries	0		0		0		0
Other expense, net	(482)		(174)		(1,210)		(878)
Total other expense	(34,445)		(35,612)		(69,821)		(136,275)
Net income (loss)	14,562		9,471		28,959		(57,919)
Loss attributable to non-controlling interests	470		155		839		291
Net income (loss) attributable to Mohegan Tribal Gaming Authority	15,032		9,626		29,798		(57,628)
Authority
Revenues:
Gaming	210,035		210,530		422,578		419,004
Food and beverage	14,504		15,445		30,330		31,369
Hotel	10,930		10,764		21,919		21,015
Retail, entertainment and other	21,245		23,688		46,613		50,947
Gross revenues	256,714		260,427		521,440		522,335
Less-Promotional allowances	(16,947)		(16,960)		(36,150)		(37,227)
Net revenues	239,767		243,467		485,290		485,108
Operating costs and expenses:
Gaming	109,633		116,506		228,060		244,622
Food and beverage	8,481		8,735		17,210		16,739
Hotel	3,313		3,969		6,731		7,626
Retail, entertainment and other	8,063		10,256		18,847		22,188
Advertising, general and administrative	40,653		39,815		78,741		78,318
Corporate	5,711		3,045		9,202		6,473
Depreciation and amortization	15,962		17,162		32,243		32,694
Loss on disposition of assets	80		52		817		51
Severance	3,244				3,244
Impairment of Project Horizon	2,502				2,502
Relinquishment liability reassessment	(299)				(243)
Pre-opening			0				0
Total operating costs and expenses	197,343		199,540		397,354		408,711
Income from operations	42,424		43,927		87,936		76,397
Other income (expense):
Accretion of discount to the relinquishment liability			(551)		(227)		(1,102)
Interest income	10		20		22		45
Interest expense, net of capitalized interest	(23,671)		(23,293)		(47,697)		(49,289)
Loss on early extinguishment of debt			(192)				(62,275)
Loss on interests in subsidiaries	(3,775)		(10,402)		(10,247)		(21,519)
Other expense, net	44		117		11		115
Total other expense	(27,392)		(34,301)		(58,138)		(134,025)
Net income (loss)	15,032		9,626		29,798		(57,628)
Loss attributable to non-controlling interests	0		0		0		0
Net income (loss) attributable to Mohegan Tribal Gaming Authority	15,032		9,626		29,798		(57,628)
Total Guarantor Subsidiaries
Revenues:
Gaming	64,981	[1]	67,870	[1]	130,172	[1]	134,149	[1]
Food and beverage	6,523	[1]	7,168	[1]	13,368	[1]	13,963	[1]
Hotel	1,343	[1]	1,147	[1]	2,580	[1]	1,588	[1]
Retail, entertainment and other	2,089	[1]	2,099	[1]	4,451	[1]	4,125	[1]
Gross revenues	74,936	[1]	78,284	[1]	150,571	[1]	153,825	[1]
Less-Promotional allowances	(4,807)	[1]	(5,292)	[1]	(9,797)	[1]	(9,867)	[1]
Net revenues	70,129	[1]	72,992	[1]	140,774	[1]	143,958	[1]
Operating costs and expenses:
Gaming	46,033	[1]	49,233	[1]	93,705	[1]	97,419	[1]
Food and beverage	1,748	[1]	2,014	[1]	3,830	[1]	4,109	[1]
Hotel	1,376	[1]	1,318	[1]	2,674	[1]	1,853	[1]
Retail, entertainment and other	666	[1]	1,097	[1]	1,626	[1]	1,942	[1]
Advertising, general and administrative	8,118	[1]	8,073	[1]	15,889	[1]	16,531	[1]
Corporate	0	[1]	0	[1]	0	[1]	0	[1]
Depreciation and amortization	3,280	[1]	3,477	[1]	6,807	[1]	6,898	[1]
Loss on disposition of assets	0	[1]	1	[1]	2	[1]	1	[1]
Severance	126	[1]			126	[1]
Impairment of Project Horizon	0	[1]			0	[1]
Relinquishment liability reassessment	0	[1]			0	[1]
Pre-opening			25	[1]			1,187	[1]
Total operating costs and expenses	61,347	[1]	65,238	[1]	124,659	[1]	129,940	[1]
Income from operations	8,782	[1]	7,754	[1]	16,115	[1]	14,018	[1]
Other income (expense):
Accretion of discount to the relinquishment liability			0	[1]	0	[1]	0	[1]
Interest income	1,530	[1]	1,113	[1]	2,973	[1]	2,097	[1]
Interest expense, net of capitalized interest	(9,993)	[1]	(10,888)	[1]	(20,099)	[1]	(22,205)	[1]
Loss on early extinguishment of debt			0	[1]			0	[1]
Loss on interests in subsidiaries	(1,778)	[1]	(7,110)	[1]	(4,941)	[1]	(12,417)	[1]
Other expense, net	0	[1]	0	[1]	0	[1]	0	[1]
Total other expense	(10,241)	[1]	(16,885)	[1]	(22,067)	[1]	(32,525)	[1]
Net income (loss)	(1,459)	[1]	(9,131)	[1]	(5,952)	[1]	(18,507)	[1]
Loss attributable to non-controlling interests	0	[1]	0	[1]	0	[1]	0	[1]
Net income (loss) attributable to Mohegan Tribal Gaming Authority	(1,459)	[1]	(9,131)	[1]	(5,952)	[1]	(18,507)	[1]
Total Non-Guarantor Subsidiaries and Entities
Revenues:
Gaming	0	[2]	0	[3]	0	[2]	0	[3]
Food and beverage	92	[2]	0	[3]	92	[2]	0	[3]
Hotel	0	[2]	0	[3]	0	[2]	0	[3]
Retail, entertainment and other	2,046	[2]	1,504	[3]	3,888	[2]	2,256	[3]
Gross revenues	2,138	[2]	1,504	[3]	3,980	[2]	2,256	[3]
Less-Promotional allowances	0	[2]	(6)	[3]	(3)	[2]	(9)	[3]
Net revenues	2,138	[2]	1,498	[3]	3,977	[2]	2,247	[3]
Operating costs and expenses:
Gaming	0	[2]	0	[3]	0	[2]	0	[3]
Food and beverage	0	[2]	0	[3]	0	[2]	0	[3]
Hotel	0	[2]	0	[3]	0	[2]	0	[3]
Retail, entertainment and other	1,186	[2]	0	[3]	1,688	[2]	0	[3]
Advertising, general and administrative	2,829	[2]	7,856	[3]	6,993	[2]	13,901	[3]
Corporate	0	[2]	0	[3]	0	[2]	0	[3]
Depreciation and amortization	322	[2]	240	[3]	567	[2]	405	[3]
Loss on disposition of assets	0	[2]	0	[3]	0	[2]	0	[3]
Severance	0	[2]			0	[2]
Impairment of Project Horizon	0	[2]			0
Relinquishment liability reassessment	0	[2]			0
Pre-opening			0	[3]			0	[3]
Total operating costs and expenses	4,337	[2]	8,096	[3]	9,248	[2]	14,306	[3]
Income from operations	(2,199)	[2]	(6,598)	[3]	(5,271)	[2]	(12,059)	[3]
Other income (expense):
Accretion of discount to the relinquishment liability			0	[3]	0	[2]	0	[3]
Interest income	1,923	[2]	1,688	[3]	3,852	[2]	3,337	[3]
Interest expense, net of capitalized interest	(3,762)	[2]	(3,335)	[3]	(7,435)	[2]	(6,005)	[3]
Loss on early extinguishment of debt			0	[3]			0	[3]
Loss on interests in subsidiaries	0	[2]	0	[3]	0	[2]	0	[3]
Other expense, net	(526)	[2]	(291)	[3]	(1,221)	[2]	(993)	[3]
Total other expense	(2,365)	[2]	(1,938)	[3]	(4,804)	[2]	(3,661)	[3]
Net income (loss)	(4,564)	[2]	(8,536)	[3]	(10,075)	[2]	(15,720)	[3]
Loss attributable to non-controlling interests	209	[2]	0	[3]	460	[2]	0	[3]
Net income (loss) attributable to Mohegan Tribal Gaming Authority	(4,355)	[2]	(8,536)	[3]	(9,615)	[2]	(15,720)	[3]
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)		(2,546)		(1,805)
Gross revenues	(1,273)		(1,273)		(2,546)		(1,805)
Less-Promotional allowances	(338)		(1)		(340)		(2)
Net revenues	(1,611)		(1,274)		(2,886)		(1,807)
Operating costs and expenses:
Gaming	0		0		0		0
Food and beverage	0		0		0		0
Hotel	(1,213)		(1,213)		(2,426)		(1,685)
Retail, entertainment and other	(338)		(1)		(340)		(2)
Advertising, general and administrative	(2,991)		(7,875)		(7,199)		(13,939)
Corporate	2,931		7,815		7,079		13,819
Depreciation and amortization	0		0		0		0
Loss on disposition of assets	0		0		0		0
Severance	0				0
Impairment of Project Horizon	0				0
Relinquishment liability reassessment	0				0
Pre-opening			0				0
Total operating costs and expenses	(1,611)		(1,274)		(2,886)		(1,807)
Income from operations	0		0		0		0
Other income (expense):
Accretion of discount to the relinquishment liability			0		0		0
Interest income	(1,649)		(1,219)		(3,199)		(2,233)
Interest expense, net of capitalized interest	1,649		1,219		3,199		2,233
Loss on early extinguishment of debt			0				0
Loss on interests in subsidiaries	5,553		17,512		15,188		33,936
Other expense, net	0		0		0		0
Total other expense	5,553		17,512		15,188		33,936
Net income (loss)	5,553		17,512		15,188		33,936
Loss attributable to non-controlling interests	261		155		379		291
Net income (loss) attributable to Mohegan Tribal Gaming Authority	$ 5,814		$ 17,667		$ 15,567		$ 34,227

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

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

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