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Joint Ventures and Variable Interest Entities - Equity in Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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