COMMITMENTS AND CONTINGENCIES	3 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES: Slot Win and Free Promotional Slot Play Contributions In May 1994, the Tribe and the State of Connecticut entered into a Memorandum of Understanding (“MOU”), which sets forth certain matters regarding implementation of the Mohegan Compact. The MOU stipulates that a portion of revenues from slot machines must be paid to the State of Connecticut (“Slot Win Contribution”). Slot Win Contribution payments are not required if the State of Connecticut legalizes any other gaming operation with slot machines, video facsimiles of games of chance or other commercial casino games within the State of Connecticut, except those consented to by the Tribe and the MPT. For each 12-month period commencing July 1, 1995, Slot Win Contribution payments shall be the lesser of: (1) 30% of gross revenues from slot machines or (2) the greater of (a) 25% of gross revenues from slot machines or (b) $80.0 million. In September 2009, the Authority entered into a settlement agreement with the State of Connecticut regarding contribution payments on the Authority's free promotional slot play program. Under the terms of the settlement agreement, effective July 1, 2009, the State of Connecticut agreed that no value shall be attributed to free promotional slot plays utilized by patrons at Mohegan Sun for purposes of calculating monthly contribution payments, provided that the aggregate amount of free promotional slot plays during any month does not exceed a certain threshold of gross revenues from slot machines for such month. In the event free promotional slot plays granted by the Authority exceed such threshold, contribution payments are required on such excess face amount of free promotional slot plays at the same rate as Slot Win Contribution payments, or 25%. The threshold before contribution payments on free promotional slot plays are required is currently 11% of gross revenues from slot machines. The Authority reflected expenses associated with the combined Slot Win Contribution and free promotional slot play contribution totaling $37.0 million and $35.8 million for the three months ended December 31, 2016 and 2015, respectively. As of December 31, 2016 and September 30, 2016, the combined outstanding Slot Win Contribution and free promotional slot play contribution totaled $12.5 million and $12.3 million, respectively. Pennsylvania Slot Machine Tax Downs Racing holds a Category One slot machine license issued by the Pennsylvania Gaming Control Board (the “PGCB”) for the operation of slot machines at Mohegan Sun Pocono. This license permits Downs Racing to install and operate up to 3,000 slot machines at Mohegan Sun Pocono, expandable to up to a total of 5,000 slot machines upon request and approval of the PGCB. The Pennsylvania Race Horse Development and Gaming Act stipulates that holders of Category One slot machine licenses must pay a portion of revenues from slot machines to the PGCB on a daily basis (“Pennsylvania Slot Machine Tax”), which includes local share assessments to be paid to the cities and municipalities hosting Mohegan Sun Pocono and amounts to be paid to the Pennsylvania State Horse Racing Commission (the “PSHRC”). The Pennsylvania Slot Machine Tax is currently 55% of gross revenues from slot machines. By statute, 2% of the Pennsylvania Slot Machine Tax is subject to a $10.0 million minimum annual threshold to ensure that the host cities and municipalities receive an annual minimum of $10.0 million in local share assessments. However, on September 28, 2016, the Pennsylvania Supreme Court declared this provision to be unconstitutional and imposed a deadline of 120 days before its ruling will take effect. Downs Racing maintains a $1.5 million escrow deposit in the name of the Commonwealth of Pennsylvania for Pennsylvania Slot Machine Tax payments, which was included in other assets, net in the accompanying condensed consolidated balance sheets. The Authority reflected expenses associated with the Pennsylvania Slot Machine Tax totaling $27.7 million and $30.4 million for the three months ended December 31, 2016 and 2015, respectively. As of December 31, 2016 and September 30, 2016, outstanding Pennsylvania Slot Machine Tax payments totaled $7.1 million and $4.8 million, respectively. Pennsylvania Table Game Tax In January 2010, the Commonwealth of Pennsylvania amended the Pennsylvania Race Horse Development and Gaming Act to allow slot machine operators in the Commonwealth of Pennsylvania to obtain a table game operation certificate and operate certain table games, including poker. Under the amended law, holders of table game operation certificates must pay a portion of revenues from table games to the PGCB on a weekly basis (“Pennsylvania Table Game Tax”). The Pennsylvania Table Game Tax was 12%, plus 2% in local share assessments. Effective August 1, 2016, the Pennsylvania Table Game Tax was increased to 14%, plus the 2% local share assessments. The Authority reflected expenses associated with the Pennsylvania Table Game Tax totaling $1.8 million and $1.6 million for the three months ended December 31, 2016 and 2015, respectively. As of December 31, 2016 and September 30, 2016, outstanding Pennsylvania Table Game Tax payments totaled $161,000 and $93,000, respectively. Pennsylvania Regulatory Fee Slot machine licensees in the Commonwealth of Pennsylvania are required to reimburse state gaming regulatory agencies for various administrative and operating expenses (“Pennsylvania Regulatory Fee”). The Pennsylvania Regulatory Fee was 1.5% of gross revenues from slot machines and table games. Effective August 1, 2016, the Pennsylvania Regulatory Fee was increased to 1.7% of gross revenues from slot machines and table games. The Authority reflected expenses associated with the Pennsylvania Regulatory Fee totaling $1.2 million for each of the three months ended December 31, 2016 and 2015. As of December 31, 2016 and September 30, 2016, outstanding Pennsylvania Regulatory Fee payments to the PGCB totaled $157,000 and $112,000, respectively. Pennsylvania Gaming Control Board Loans The PGCB was initially granted $36.1 million in loans to fund start-up costs for gaming in the Commonwealth of Pennsylvania, which are to be repaid by slot machine licensees (the "Initial Loans"). The PGCB was subsequently granted an additional $63.8 million in loans to fund ongoing gaming oversight costs, which are also to be repaid by slot machine licensees (the "Subsequent Loans"). Repayment of the Initial Loans will commence when all 14 authorized gaming facilities are opened in the Commonwealth of Pennsylvania. Currently, 12 of the 14 authorized gaming facilities have commenced operations. As of December 31, 2016, the Authority has concluded that a repayment contingency for the Initial Loans is probable but not reasonably estimable since the PGCB has not yet established a method of assessment of repayment for the Initial Loans and, as such, the Authority has not recorded a related accrual for such repayment. In June 2011, the PGCB adopted a method of assessment of repayment for the Subsequent Loans pursuant to which repayment commenced on January 1, 2012 and will continue over a 10-year period in accordance with a formula based on a combination of a single fiscal year and cumulative gross revenues from slot machines for each operating slot machine licensee. The Authority reflected expenses associated with this repayment schedule totaling $152,000 and $157,000 for the three months ended December 31, 2016 and 2015, respectively. Horsemen’s Agreement Downs Racing and the PSHRC are parties to an agreement that governs all live harness racing and simulcasting and account wagering at the Pennsylvania Facilities through December 31, 2017. As of December 31, 2016 and September 30, 2016, outstanding payments to the PSHRC for purses earned by horsemen, but not yet paid, totaled $5.0 million. Priority Distribution Agreement In August 2001, the Authority and the Tribe entered into an agreement (the “Priority Distribution Agreement”), which stipulates that the Authority must make monthly payments to the Tribe to the extent of the Authority's Net Cash Flow as defined under the Priority Distribution Agreement. The Priority Distribution Agreement was amended as of December 31, 2014. As amended, the Priority Distribution Agreement, which has a perpetual term, limits the minimum aggregate priority distribution payments in each calendar year to $40.0 million. Payments under the Priority Distribution Agreement: (1) do not reduce the Authority's obligations to reimburse the Tribe for governmental and administrative services provided by the Tribe or to make payments under any other agreements with the Tribe, (2) are limited obligations of the Authority and are payable only to the extent of the Authority's Net Cash Flow as defined under the Priority Distribution Agreement and (3) are not secured by a lien or encumbrance on any of the Authority's assets or properties. The Authority reflected payments associated with the Priority Distribution Agreement totaling $10.0 million for each of the three months ended December 31, 2016 and 2015. Litigation and Legal Proceedings On February 2, 2017, the Authority was informed by a representative of the PGCB’s Office of Enforcement Counsel (“OEC”) that OEC is nearing completion of a review of possible operational control deficiencies at Mohegan Sun Pocono, and that based on OEC’s preliminary findings, OEC anticipates that Mohegan Sun Pocono will be subject to disciplinary action including a fine and undertakings to remediate the issues identified by OEC. The operational control deficiencies, which the Authority is presently in the process of remediating, relate to, among other things, its system of tracking and reporting the issuance of certain customer incentives such as free promotional slot play. On February 14, 2017, the Authority informed OEC that, in connection with the Authority’s ongoing review of Mohegan Sun Pocono’s operations, the Authority terminated in January 2017 Mohegan Sun Pocono’s business relationship with ReferLocal, a marketing and advertising company with which Mohegan Sun Pocono did business since 2011 and in which the Authority’s former President and Chief Executive Officer has a 5% equity interest, which equity interest had not previously been disclosed to the Authority’s Management Board. On February 3, 2017, the Authority received a letter from counsel to ReferLocal asserting, among other things, that ReferLocal had suffered damages in connection with the termination of this business relationship and may seek recovery of such damages from the Authority and its former President and Chief Executive Officer. ReferLocal is not registered with the PGCB as a gaming service provider, and the Authority cannot predict whether OEC will conclude that such registration was required or that one or more other aspects of Mohegan Sun Pocono’s prior business relationship with ReferLocal was not in compliance with applicable gaming regulations. The outcome of the foregoing matters is uncertain and the Authority cannot estimate the extent of materiality or the amount or range of reasonably possible loss that may result from them. The Authority is also a defendant in various claims and legal actions resulting from its normal course of business. Some of these matters relate to personal injuries to patrons and damages to patrons' personal assets. The Authority estimates guest claims expense and accrues for such liabilities based upon historical experience. In management's opinion, the aggregate liability, if any, arising from such litigations will not have a material impact on the Authority's financial position, results of operations or cash flows.

COMMITMENTS AND CONTINGENCIES:

Slot Win and Free Promotional Slot Play Contributions

In May 1994, the Tribe and the State of Connecticut entered into a Memorandum of Understanding (“MOU”), which sets forth certain matters regarding implementation of the Mohegan Compact. The MOU stipulates that a portion of revenues from slot machines must be paid to the State of Connecticut (“Slot Win Contribution”). Slot Win Contribution payments are not required if the State of Connecticut legalizes any other gaming operation with slot machines, video facsimiles of games of chance or other commercial casino games within the State of Connecticut, except those consented to by the Tribe and the MPT. For each 12-month period commencing July 1, 1995, Slot Win Contribution payments shall be the lesser of: (1) 30% of gross revenues from slot machines or (2) the greater of (a) 25% of gross revenues from slot machines or (b) $80.0 million.

In September 2009, the Authority entered into a settlement agreement with the State of Connecticut regarding contribution payments on the Authority's free promotional slot play program. Under the terms of the settlement agreement, effective July 1, 2009, the State of Connecticut agreed that no value shall be attributed to free promotional slot plays utilized by patrons at Mohegan Sun for purposes of calculating monthly contribution payments, provided that the aggregate amount of free promotional slot plays during any month does not exceed a certain threshold of gross revenues from slot machines for such month. In the event free promotional slot plays granted by the Authority exceed such threshold, contribution payments are required on such excess face amount of free promotional slot plays at the same rate as Slot Win Contribution payments, or 25%. The threshold before contribution payments on free promotional slot plays are required is currently 11% of gross revenues from slot machines.

The Authority reflected expenses associated with the combined Slot Win Contribution and free promotional slot play contribution totaling $37.0 million and $35.8 million for the three months ended December 31, 2016 and 2015, respectively. As of December 31, 2016 and September 30, 2016, the combined outstanding Slot Win Contribution and free promotional slot play contribution totaled $12.5 million and $12.3 million, respectively.

Pennsylvania Slot Machine Tax

Downs Racing holds a Category One slot machine license issued by the Pennsylvania Gaming Control Board (the “PGCB”) for the operation of slot machines at Mohegan Sun Pocono. This license permits Downs Racing to install and operate up to 3,000 slot machines at Mohegan Sun Pocono, expandable to up to a total of 5,000 slot machines upon request and approval of the PGCB.

The Pennsylvania Race Horse Development and Gaming Act stipulates that holders of Category One slot machine licenses must pay a portion of revenues from slot machines to the PGCB on a daily basis (“Pennsylvania Slot Machine Tax”), which includes local share assessments to be paid to the cities and municipalities hosting Mohegan Sun Pocono and amounts to be paid to the Pennsylvania State Horse Racing Commission (the “PSHRC”). The Pennsylvania Slot Machine Tax is currently 55% of gross revenues from slot machines. By statute, 2% of the Pennsylvania Slot Machine Tax is subject to a $10.0 million minimum annual threshold to ensure that the host cities and municipalities receive an annual minimum of $10.0 million in local share assessments. However, on September 28, 2016, the Pennsylvania Supreme Court declared this provision to be unconstitutional and imposed a deadline of 120 days before its ruling will take effect. Downs Racing maintains a $1.5 million escrow deposit in the name of the Commonwealth of Pennsylvania for Pennsylvania Slot Machine Tax payments, which was included in other assets, net in the accompanying condensed consolidated balance sheets.

The Authority reflected expenses associated with the Pennsylvania Slot Machine Tax totaling $27.7 million and $30.4 million for the three months ended December 31, 2016 and 2015, respectively. As of December 31, 2016 and September 30, 2016, outstanding Pennsylvania Slot Machine Tax payments totaled $7.1 million and $4.8 million, respectively.

Pennsylvania Table Game Tax

In January 2010, the Commonwealth of Pennsylvania amended the Pennsylvania Race Horse Development and Gaming Act to allow slot machine operators in the Commonwealth of Pennsylvania to obtain a table game operation certificate and operate certain table games, including poker. Under the amended law, holders of table game operation certificates must pay a portion of revenues from table games to the PGCB on a weekly basis (“Pennsylvania Table Game Tax”). The Pennsylvania Table Game Tax was 12%, plus 2% in local share assessments. Effective August 1, 2016, the Pennsylvania Table Game Tax was increased to 14%, plus the 2% local share assessments.

The Authority reflected expenses associated with the Pennsylvania Table Game Tax totaling $1.8 million and $1.6 million for the three months ended December 31, 2016 and 2015, respectively. As of December 31, 2016 and September 30, 2016, outstanding Pennsylvania Table Game Tax payments totaled $161,000 and $93,000, respectively.

Pennsylvania Regulatory Fee

Slot machine licensees in the Commonwealth of Pennsylvania are required to reimburse state gaming regulatory agencies for various administrative and operating expenses (“Pennsylvania Regulatory Fee”). The Pennsylvania Regulatory Fee was 1.5% of gross revenues from slot machines and table games. Effective August 1, 2016, the Pennsylvania Regulatory Fee was increased to 1.7% of gross revenues from slot machines and table games.

The Authority reflected expenses associated with the Pennsylvania Regulatory Fee totaling $1.2 million for each of the three months ended December 31, 2016 and 2015. As of December 31, 2016 and September 30, 2016, outstanding Pennsylvania Regulatory Fee payments to the PGCB totaled $157,000 and $112,000, respectively.

Pennsylvania Gaming Control Board Loans

The PGCB was initially granted $36.1 million in loans to fund start-up costs for gaming in the Commonwealth of Pennsylvania, which are to be repaid by slot machine licensees (the "Initial Loans"). The PGCB was subsequently granted an additional $63.8 million in loans to fund ongoing gaming oversight costs, which are also to be repaid by slot machine licensees (the "Subsequent Loans"). Repayment of the Initial Loans will commence when all 14 authorized gaming facilities are opened in the Commonwealth of Pennsylvania. Currently, 12 of the 14 authorized gaming facilities have commenced operations. As of December 31, 2016, the Authority has concluded that a repayment contingency for the Initial Loans is probable but not reasonably estimable since the PGCB has not yet established a method of assessment of repayment for the Initial Loans and, as such, the Authority has not recorded a related accrual for such repayment. In June 2011, the PGCB adopted a method of assessment of repayment for the Subsequent Loans pursuant to which repayment commenced on January 1, 2012 and will continue over a 10-year period in accordance with a formula based on a combination of a single fiscal year and cumulative gross revenues from slot machines for each operating slot machine licensee.

The Authority reflected expenses associated with this repayment schedule totaling $152,000 and $157,000 for the three months ended December 31, 2016 and 2015, respectively.

Horsemen’s Agreement

Downs Racing and the PSHRC are parties to an agreement that governs all live harness racing and simulcasting and account wagering at the Pennsylvania Facilities through December 31, 2017. As of December 31, 2016 and September 30, 2016, outstanding payments to the PSHRC for purses earned by horsemen, but not yet paid, totaled $5.0 million.

Priority Distribution Agreement

In August 2001, the Authority and the Tribe entered into an agreement (the “Priority Distribution Agreement”), which stipulates that the Authority must make monthly payments to the Tribe to the extent of the Authority's Net Cash Flow as defined under the Priority Distribution Agreement. The Priority Distribution Agreement was amended as of December 31, 2014. As amended, the Priority Distribution Agreement, which has a perpetual term, limits the minimum aggregate priority distribution payments in each calendar year to $40.0 million. Payments under the Priority Distribution Agreement: (1) do not reduce the Authority's obligations to reimburse the Tribe for governmental and administrative services provided by the Tribe or to make payments under any other agreements with the Tribe, (2) are limited obligations of the Authority and are payable only to the extent of the Authority's Net Cash Flow as defined under the Priority Distribution Agreement and (3) are not secured by a lien or encumbrance on any of the Authority's assets or properties.

The Authority reflected payments associated with the Priority Distribution Agreement totaling $10.0 million for each of the three months ended December 31, 2016 and 2015.

Litigation and Legal Proceedings

On February 2, 2017, the Authority was informed by a representative of the PGCB’s Office of Enforcement Counsel (“OEC”) that OEC is nearing completion of a review of possible operational control deficiencies at Mohegan Sun Pocono, and that based on OEC’s preliminary findings, OEC anticipates that Mohegan Sun Pocono will be subject to disciplinary action including a fine and undertakings to remediate the issues identified by OEC. The operational control deficiencies, which the Authority is presently in the process of remediating, relate to, among other things, its system of tracking and reporting the issuance of certain customer incentives such as free promotional slot play.

On February 14, 2017, the Authority informed OEC that, in connection with the Authority’s ongoing review of Mohegan Sun Pocono’s operations, the Authority terminated in January 2017 Mohegan Sun Pocono’s business relationship with ReferLocal, a marketing and advertising company with which Mohegan Sun Pocono did business since 2011 and in which the Authority’s former President and Chief Executive Officer has a 5% equity interest, which equity interest had not previously been disclosed to the Authority’s Management Board. On February 3, 2017, the Authority received a letter from counsel to ReferLocal asserting, among other things, that ReferLocal had suffered damages in connection with the termination of this business relationship and may seek recovery of such damages from the Authority and its former President and Chief Executive Officer. ReferLocal is not registered with the PGCB as a gaming service provider, and the Authority cannot predict whether OEC will conclude that such registration was required or that one or more other aspects of Mohegan Sun Pocono’s prior business relationship with ReferLocal was not in compliance with applicable gaming regulations.

The outcome of the foregoing matters is uncertain and the Authority cannot estimate the extent of materiality or the amount or range of reasonably possible loss that may result from them.

The Authority is also a defendant in various claims and legal actions resulting from its normal course of business. Some of these matters relate to personal injuries to patrons and damages to patrons' personal assets. The Authority estimates guest claims expense and accrues for such liabilities based upon historical experience. In management's opinion, the aggregate liability, if any, arising from such litigations will not have a material impact on the Authority's financial position, results of operations or cash flows.