Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Tax Credit Carryforward [Line Items]
Net operating income	$ 75,196	$ 7,353	$ (162,016)
Operating loss carryforwards	117,800
Valuation allowance	19,919	$ 0
Niagara Resorts
Tax Credit Carryforward [Line Items]
Net operating income	$ 66,700