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Income Taxes - Text (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 0.7 | $ 0.9 |
Deferred Tax Assets, Valuation Allowance | (0.6) | (0.8) |
Unrecognized Tax Benefits | 0.0 | 0.0 | $ 0.0
Corporate AMT credit carryforwards | 16.5 | 0.0 |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 0.7 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 0.3 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 0.4 |  |
D.R. Horton, Inc. [Member] | Reimbursement To Parent [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 0.9 | $ 2.2 | $ 1.7

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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