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Inventory - Schedule of Impairment Charges Taken on Projects in Progress (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
lot
community
Jun. 30, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
# of Communities Impaired | community     1  
# of Lots Impaired | lot     37  
Impairment Charge $ 0 $ 8,642,000 $ 1,295,000 $ 8,642,000
Level 3 | Estimated Fair Value of Impaired Inventory at Time of Impairment        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Estimated Fair Value of Impaired Inventory at Time of Impairment 5,597,000   $ 5,597,000  
Operating Segments | West        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
# of Communities Impaired | community     1  
# of Lots Impaired | lot     37  
Impairment Charge 0 2,236,000 $ 1,174,000 2,236,000
Operating Segments | West | Level 3 | Estimated Fair Value of Impaired Inventory at Time of Impairment        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Estimated Fair Value of Impaired Inventory at Time of Impairment 5,072,000   $ 5,072,000  
Corporate and unallocated        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
# of Communities Impaired | community     0  
# of Lots Impaired | lot     0  
Impairment Charge 0 $ 1,002,000 $ 121,000 $ 1,002,000
Corporate and unallocated | Level 3 | Estimated Fair Value of Impaired Inventory at Time of Impairment        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Estimated Fair Value of Impaired Inventory at Time of Impairment $ 525,000   $ 525,000