MOHEGAN VENTURES-NORTHWEST, LLC (COWLITZ PROJECT) - Reconciliation of Development Fees (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2017 USD ($)
Development Fees [Roll Forward]
Beginning balance	$ 3,508
Fees earned, including interest receivable	1,119
Payments received	(2,000)
Ending balance	$ 2,627