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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, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Financial Information
Equity in earnings of joint ventures	$ 16,800	$ 8,600	$ 13,500	$ 9,900	$ 16,900	$ 9,200	$ 16,600	$ 6,600	$ 48,781	$ 49,320	$ 49,357
Pass through joint ventures
Financial Information
Equity in earnings of joint ventures									34,100	31,600	34,200
Other joint ventures
Financial Information
Equity in earnings of joint ventures									$ 14,700	$ 17,700	$ 15,200

X

- Definition

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

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