MOHEGAN VENTURES-NORTHWEST, LLC (COWLITZ PROJECT) - Reconciliation of Development Fees (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Development Fees [Roll Forward]
Beginning balance	$ 2,627	$ 3,508
Fees earned, including interest receivable	(230)	889
Payments received	(1,000)	(3,000)
Ending balance	$ 1,397	$ 1,397