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Joint Ventures and Variable Interest Entities - Schedule of Equity in Earnings of Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Joint Ventures and Variable Interest Entities [Line Items]
Total	$ 5,290	$ 7,647	$ 21,707	$ (1,835)
Unconsolidated Joint Ventures
Joint Ventures and Variable Interest Entities [Line Items]
Total			21,700	(1,800)
Unconsolidated Joint Ventures | Pass-through joint ventures
Joint Ventures and Variable Interest Entities [Line Items]
Total			21,600	24,700
Unconsolidated Joint Ventures | Other joint ventures
Joint Ventures and Variable Interest Entities [Line Items]
Total			$ 100	$ (26,500)

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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