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Fair Value Measurements - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Fair Value Disclosures [Abstract]      
Impairment of projects in process $ 0 $ 0 $ 0
Impairment of land held for sale $ 0 $ 1,868,000 $ 0