CONSOLIDATED STATEMENTS OF CASH FLOWS	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Cash flows provided by (used in) operating activities:
Net income (loss)	$ (2,376,000)	$ 131,608,000	$ 76,417,000
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:
Depreciation and amortization	122,657,000	81,789,000	74,443,000
Accretion of discounts	1,188,000	2,163,000	3,840,000
Amortization of discounts and debt issuance costs	19,562,000	15,485,000	7,192,000
Provision for (recovery of) losses on receivables	976,000	(5,937,000)	(5,838,000)
Impairment of Mohegan Sun Pocono's goodwill	39,459,000	0	0
Deferred income taxes	637,000	0	0
Loss on modification and early extinguishment of debt	0	0	65,216,000
Share-based compensation	0	0	7,569,000
Other, net	(888,000)	609,000	1,567,000
Changes in operating assets and liabilities, net of effect of the MGE Niagara Resorts acquisition:
Accounts receivable	(6,558,000)	(4,859,000)	(429,000)
Accrued interest on notes receivable related to the Cowlitz Project	71,579,000	(12,857,000)	(10,496,000)
Inventories	461,000	(405,000)	360,000
Due from Ontario Lottery and Gaming Corporation	(10,943,000)	0	0
Casino Operating and Services Agreement customer contract asset	(53,191,000)	0	0
Other assets	(3,646,000)	(5,050,000)	(2,559,000)
Trade payables	1,992,000	725,000	1,606,000
Accrued interest	387,000	391,000	13,515,000
Due to Ontario Lottery and Gaming Corporation	29,122,000	0	0
Other liabilities	(10,019,000)	11,048,000	1,833,000
Net cash flows provided by operating activities	200,399,000	214,710,000	234,236,000
Cash flows used in investing activities:
Purchases of property and equipment	(77,613,000)	(136,551,000)	(85,499,000)
Acquisition of the MGE Niagara Resorts, net of cash acquired	(72,287,000)	0	0
Proceeds from notes receivable related to the Cowlitz Project	32,026,000	0	0
Investments related to Project Inspire	(18,601,000)	0	0
Other, net	(7,105,000)	(8,265,000)	(17,735,000)
Net cash flows used in investing activities	(143,580,000)	(144,816,000)	(103,234,000)
Cash flows provided by (used in) financing activities:
Proceeds from line of credit	30,088,000	0	0
Proceeds from senior unsecured notes, net of discount	0	0	496,355,000
Other borrowings	11,335,000	42,264,000	14,700,000
Repayments of other long-term debt	(9,419,000)	(269,000)	(34,851,000)
Payments on capital lease obligations	(292,000)	0	(1,521,000)
Payments of distributions to affiliates	(60,000,000)	(60,000,000)	(60,000,000)
Redemption of Mohegan Tribe membership interest in the Cowlitz Project	(10,000,000)	0	0
Redemption of membership interest in Project Inspire	0	(106,702,000)	0
Payments of tender offer and repurchase costs	0	0	(50,308,000)
Payments of financing fees	(3,263,000)	(10,996,000)	(25,811,000)
Other, net	(1,527,000)	(1,527,000)	0
Net cash flows provided by (used in) financing activities	2,041,000	(83,990,000)	(175,133,000)
Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents	58,860,000	(14,096,000)	(44,131,000)
Effect of exchange rate on cash, cash equivalents, restricted cash and restricted cash equivalents	(12,757,000)	9,666,000	(7,621,000)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year	234,626,000	239,056,000	290,808,000
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of year	280,729,000	234,626,000	239,056,000
Cash and cash equivalents	130,138,000	103,944,000	88,953,000
Restricted cash and cash equivalents, current	4,960,000	1,036,000	899,000
Restricted cash and cash equivalents, non-current	145,631,000	129,646,000	149,204,000
Supplemental disclosures:
Cash paid for interest	123,731,000	111,172,000	93,816,000
Non-cash transactions:
MGE Niagara Resorts - recognition of build-to-suit and parking license assets and liabilities	95,534,000	0	0
Capital lease obligations incurred	29,986,000	0	0
Payment by third-party for interactive gaming and sports wagering licenses	18,000,000	0	0
Construction payables	11,888,000	10,747,000	24,496,000
Initial redemption liability	0	0	68,511,000
Conversion of redemption liability to redemption note payable	0	74,084,000	0
Ownership rights settlement related to Project Inspire	0	6,335,000	0
Senior Secured Credit Facility, Term Loan A and Term Loan B
Cash flows provided by (used in) financing activities:
Repayments of line of credit	0		(29,900,000)
Repayments of other long-term debt	0	0	(100,190,000)
Credit Facility | Prior Senior Secured Credit Facility
Cash flows provided by (used in) financing activities:
Proceeds from line of credit	0	0	44,735,000
Repayments of line of credit	0	0	(57,735,000)
Credit Facility | Senior Secured Credit Facility
Cash flows provided by (used in) financing activities:
Proceeds from line of credit	1,258,939,000	1,382,631,000	1,049,366,000
Repayments of line of credit	(1,222,939,000)	(1,316,631,000)	(1,049,366,000)
Credit Facility | Senior Secured Credit Facility, Term Loan A and Term Loan B
Cash flows provided by (used in) financing activities:
Repayments of line of credit	0	0	(878,161,000)
Credit Facility | MGE Niagara Credit Facility
Cash flows provided by (used in) financing activities:
Proceeds from line of credit	75,220,000	0	0
Credit Facility | Senior Secured Credit Facility, New Term Loan A and New Term Loan B
Cash flows provided by (used in) financing activities:
Proceeds from line of credit	0	79,800,000	1,219,115,000
Repayments of line of credit	(64,307,000)	(86,064,000)	(55,949,000)
Non-cash transactions:
Senior secured credit facility reductions	13,295,000	18,858,000	0
Convertible Debenture | MGE Niagara Credit Facility
Cash flows provided by (used in) financing activities:
Repayments of line of credit	(944,000)	0	0
2016 7 7/8% Senior Unsecured Notes
Cash flows provided by (used in) financing activities:
Repayments of other long-term debt	0	0	(685,000,000)
Mohegan Tribe
Cash flows provided by (used in) financing activities:
Payments of distributions to affiliates	(730,000)	(6,496,000)	(512,000)
Salishan Company, LLC
Cash flows provided by (used in) financing activities:
Payments of distributions to affiliates	$ (120,000)	$ 0	$ 0