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Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Oct. 31, 2017
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Business Information [Line Items]          
Land purchase contract deposits $ 23.4   $ 34.5 $ 23.4  
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 10.9   13.2 10.9  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (3.8)   (5.1) (3.8)  
Property and equipment, net 7.1   8.1 7.1  
Depreciation     $ 1.3 1.1 $ 1.0
Restricted Stock Units (RSUs) [Member]          
Business Information [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     4 years 1 month 6 days    
Performance Shares          
Business Information [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     2 years    
Building and Building Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 1.8   $ 2.2 1.8  
Property, Plant and Equipment, Other Types [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross $ 9.1   $ 11.0 $ 9.1  
Minimum | Building and Building Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Useful Life     5 years    
Minimum | Property, Plant and Equipment, Other Types [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Useful Life     2 years    
Maximum | Building and Building Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Useful Life     10 years    
Maximum | Property, Plant and Equipment, Other Types [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Useful Life     10 years    
D.R. Horton, Inc. [Member] | Majority Shareholder [Member]          
Business Information [Line Items]          
Sale of Stock, Percentage of Ownership after Transaction 62.00% 75.00%