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Joint Ventures and Variable Interest Entities - Equity in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Financial Information
Equity in earnings of joint ventures	$ 11,400	$ 8,200	$ 7,200	$ 8,200	$ 16,800	$ 8,600	$ 13,500	$ 9,900	$ 35,044	$ 48,781	$ 49,320
Pass through joint ventures
Financial Information
Equity in earnings of joint ventures									23,600	34,100	31,600
Other joint ventures
Financial Information
Equity in earnings of joint ventures									$ 11,400	$ 14,700	$ 17,700

X

- Definition

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

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