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Investments in Unconsolidated Entities - Narrative (Details) - USD ($)
9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
May 19, 2022
Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]        
Impairment of unconsolidated entity investments $ 0 $ 0    
Imagine Homes        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage     33.00%  
Financial Guarantee        
Schedule of Equity Method Investments [Line Items]        
Outstanding guarantees $ 0     $ 0