SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 319,500	$ 331,484
Income (loss) from operations	43,370	55,000
Capital expenditures incurred	13,049	47,757
Total assets	2,299,319	2,312,119	$ 2,312,119
Mohegan Sun
Segment Reporting Information [Line Items]
Income (loss) from operations	44,063	56,393
Capital expenditures incurred	5,123	30,932
Total assets	1,354,193	1,364,169
Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Income (loss) from operations	7,192	7,675
Capital expenditures incurred	377	2,610
Total assets	573,976	581,079
Corporate and other
Segment Reporting Information [Line Items]
Net revenues	6,090	3,803
Income (loss) from operations	(7,885)	(9,068)
Capital expenditures incurred	7,549	14,215
Total assets	371,150	366,871
Operating segments | Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues	252,679	262,937
Operating segments | Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Net revenues	60,791	64,804
Inter-segment revenues
Segment Reporting Information [Line Items]
Net revenues	$ (60)	$ (60)