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v3.25.3

Related Party Disclosures (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 USD ($) Lot | Sep. 30, 2024 USD ($) Lot | Sep. 30, 2023 USD ($) Lot
Related Party Transaction [Line Items] |  |  |
Selling, general and administrative expense | $ 154.4 | $ 118.5 | $ 97.7
Number of Units in Real Estate Property | Lot | 65,100 | 57,800 |
Revenues | $ 1,662.4 | $ 1,509.4 | 1,436.9
Tract sales and other | 118.1 | 42.0 | 132.2
Contract assets | 0.0 | 8.9 |
D.R. Horton, Inc. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Selling, general and administrative expense | 7.3 | 5.6 | 3.8
Employee Benefits and Share-Based Compensation | 14.4 | 9.6 | 8.5
Costs and Expenses, Related Party | 1.6 | 3.1 | 2.9
Deferred Revenue, Period Increase (Decrease) | 1.1 | 2.9 | 0.0
Related Party Transaction, Purchases from Related Party | 0.4 | 0.9 | 0.8
Accrued Liabilities and Other Liabilities | 2.2 | 5.2 |
Contract assets | 6.5 |  |
D.R. Horton, Inc. [Member] | Reimbursement To Parent [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 0.9 | 2.2 | 1.7
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] | Deposits [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 20.6 | 27.5 | 10.9
D.R. Horton, Inc. [Member] | Other Expense [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | 26.5 | 22.9 | $ 21.8
D.R. Horton, Inc. [Member] | Use Rights |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 2.1 |  |
Ryan Horton and Reagan Horton |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party |  | $ 11.3 |
D.R. Horton, Inc. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of Lots Sold | Lot | 11,751 | 13,267 | 12,249
Revenues | $ 1,277.6 | $ 1,271.4 | $ 1,094.7
D.R. Horton, Inc. [Member] | Land held for future development |  |  |
Related Party Transaction [Line Items] |  |  |
Tract sales and other | $ 99.5 | $ 23.7 | $ 115.1
D.R. Horton, Inc. [Member] | Under Contract [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of Units in Real Estate Property | Lot | 22,800 | 20,500 |
Related Party Deposit Liabilities | $ 179.7 | $ 168.4 |
Related Party Transaction, Purchase Obligation from Parent | $ 2,000.0 | $ 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 | 17,600 | 17,200 |

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=for_RightofFirstOfferMember
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Data Type: | na
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