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Related Party Transactions (Details) $ in Millions	3 Months Ended		9 Months Ended
Related Party Transactions (Details) $ in Millions	Jun. 30, 2022 USD ($) Lot	Jun. 30, 2021 USD ($) Lot	Jun. 30, 2022 USD ($) Lot	Jun. 30, 2021 USD ($) Lot	Sep. 30, 2021 USD ($) Lot
Related Party Transaction [Line Items]
Number of Units in Real Estate Property \| Lot	65,300		65,300		64,400
Number of Lots Sold \| Lot	3,473	3,858	13,777	11,013
Revenue, Net (Deprecated 2018-01-31)	$ 308.5	$ 312.9	$ 1,137.7	$ 907.1
D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party			3.1	2.9
Related Party Transaction, Expenses from Transactions with Related Party			5.5	3.4
Costs and Expenses, Related Party			5.6	5.5
Deferred Revenue, Period Increase (Decrease)	0.5	(3.9)	2.1	(3.9)
Related Party Transaction, Purchases from Related Party	0.4	$ 1.3	2.0	$ 4.2
Payments for Commissions	0.2
Due to Related Parties, Current	$ 1.1		$ 1.1		$ 6.7
D.R. Horton, Inc. [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Rate			16.00%
D.R. Horton, Inc. [Member] \| Minimum [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Rate			12.00%
D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Number of Lots Sold \| Lot	3,038	3,719	11,823	10,466
Revenue from Related Parties	$ 257.6	$ 300.4	$ 975.7	$ 860.0
D.R. Horton, Inc. [Member] \| Other Income
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 0.0	2.4	$ 0.0	2.4
Under Contract [Member] \| D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Number of Units in Real Estate Property \| Lot	19,300		19,300		21,000
Related Party Transaction, Purchase Obligation from Parent	$ 1,496.5		$ 1,496.5		$ 1,582.7
Under Contract [Member] \| D.R. Horton, Inc. [Member] \| Notes Payable, Other Payables
Related Party Transaction [Line Items]
Related Party Deposit Liabilities	0.0		0.0		0.7
Under Contract [Member] \| D.R. Horton, Inc. [Member] \| Cash
Related Party Transaction [Line Items]
Related Party Deposit Liabilities	$ 139.2		$ 139.2		$ 143.1
Right of First Offer [Member] \| D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Number of Units in Real Estate Property \| Lot	19,100		19,100		18,200
Other Expense [Member] \| D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 18.3	14.9	$ 56.1	43.1
Deposits [Member] \| D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 4.2	$ 3.5	$ 9.6	$ 27.7
Land [Member] \| D.R. Horton, Inc. [Member]
Related Party Transaction [Line Items]
Number of Lots Sold \| Lot	0	7	0	21
Revenue from Related Parties	$ 0.0	$ 3.0	$ 0.0	$ 6.0
Real Estate [Member] \| Residential Real Estate [Member]
Related Party Transaction [Line Items]
Revenue, Net (Deprecated 2018-01-31)	$ 303.0	$ 307.4	$ 1,100.0	$ 894.5