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Related Party Disclosures (Details) $ in Millions	3 Months Ended
	Dec. 31, 2024 USD ($) Lot	Dec. 31, 2023 USD ($) Lot	Sep. 30, 2024 USD ($) Lot
Related Party Transaction [Line Items]
Selling, general and administrative expense	$ 36.0	$ 28.0
Number of Units in Real Estate Property | Lot	68,300		57,800
Revenue from Contract with Customer, Including Assessed Tax	$ 247.4	304.2
Tract sales and other	3.0	0.4
D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Selling, general and administrative expense	1.8	1.3
Employee Benefits and Share-Based Compensation	3.5	2.4
Costs and Expenses, Related Party	0.2	0.3
Related Party Transaction, Purchases from Related Party	0.1	0.5
Accrued Liabilities and Other Liabilities	2.1		$ 5.2
D.R. Horton, Inc. [Member] | Deposits [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	10.0	13.3
D.R. Horton, Inc. [Member] | Other Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	4.2	$ 4.6
D.R. Horton, Inc. [Member] | Use Rights
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 2.1
D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Number of Lots Sold | Lot	2,112	2,834
Revenue from Contract with Customer, Including Assessed Tax	$ 217.4	$ 272.8
Deferred Revenue, Period Increase (Decrease)	$ 1.2	0.7
D.R. Horton, Inc. [Member] | Minimum
Related Party Transaction [Line Items]
Related Party Transaction, Rate	12.00%
D.R. Horton, Inc. [Member] | Maximum
Related Party Transaction [Line Items]
Related Party Transaction, Rate	16.00%
D.R. Horton, Inc. [Member] | Land held for future development
Related Party Transaction [Line Items]
Tract sales and other	$ 2.0	$ 0.0
D.R. Horton, Inc. [Member] | Under Contract [Member]
Related Party Transaction [Line Items]
Number of Units in Real Estate Property | Lot	24,500		20,500
Related Party Deposit Liabilities	$ 202.9		$ 168.4
Related Party Transaction, Purchase Obligation from Parent	$ 2,136.7		$ 1,840.5
D.R. Horton, Inc. [Member] | Right of First Offer [Member]
Related Party Transaction [Line Items]
Number of Units in Real Estate Property | Lot	19,300		17,200

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