Unconsolidated Significant Subsidaries - Summary of Selected Key Financial Data of Unconsolidated Significant Subsidiaries (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Total expenses	$ (19,630)	$ (15,825)
RAM Energy Holdings LLC
Schedule of Equity Method Investments [Line Items]
Total revenue	16,437	12,734
Total expenses	(11,407)	(9,315)
Net income (loss)	$ 5,030	$ 3,419