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Joint Ventures and Variable Interest Entities - Equity in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Financial Information
Equity in (losses) earnings of joint ventures			$ 2,124	$ (279,352)	$ 53,640
Impairment loss	$ 35,900	$ 307,000
Unconsolidated joint ventures
Financial Information
Equity in (losses) earnings of joint ventures			2,100	(279,400)	53,600
Unconsolidated joint ventures | Pass-through joint ventures
Financial Information
Equity in (losses) earnings of joint ventures			29,000	24,500	29,200
Unconsolidated joint ventures | Other joint ventures
Financial Information
Equity in (losses) earnings of joint ventures			$ (26,900)	$ (303,900)	$ 24,400

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