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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
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