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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value Disclosures [Abstract] |  |  |  |
Impairment of projects in process | $ 0 |  | $ 0 |
Impairment charges on land held for sale | $ 0 | $ 1,257,000 | $ 0 | $ 1,257,000

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