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Joint Ventures and Variable Interest Entities - Equity in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Financial Information
Equity in (losses) earnings of joint ventures		$ (279,352)	$ 53,640	$ 35,044
Impairment loss	$ 307,000
Unconsolidated joint ventures
Financial Information
Equity in (losses) earnings of joint ventures		(279,400)	53,600	35,000
Unconsolidated joint ventures | Pass-through joint ventures
Financial Information
Equity in (losses) earnings of joint ventures		24,500	29,200	23,600
Unconsolidated joint ventures | Other joint ventures
Financial Information
Equity in (losses) earnings of joint ventures		$ (303,900)	$ 24,400	$ 11,400

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