ORGANIZATION (Details)	12 Months Ended
	Sep. 30, 2020 a segment
Entity Information [Line Items]
Number of seats | segment	5,000
MGE Niagara
Entity Information [Line Items]
Ownership percentage	10.00%
Mohegan Sun
Entity Information [Line Items]
Size of gaming and entertainment complex (in acres)	196
Mohegan Sun Pocono
Entity Information [Line Items]
Size of gaming and entertainment complex (in acres)	400