Basis of Presentation (Policies)	9 Months Ended
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited, consolidated financial statements include the accounts of D.R. Horton, Inc. and all of its wholly-owned, majority-owned and controlled subsidiaries, which are collectively referred to as the Company, unless the context otherwise requires. Noncontrolling interests represent the proportionate equity interests in consolidated entities that are not 100% owned by the Company. As of June 30, 2023, the Company owned a 63% controlling interest in Forestar Group Inc. (Forestar) and therefore is required to consolidate 100% of Forestar within its consolidated financial statements, and the 37% interest the Company does not own is accounted for as noncontrolling interests. All intercompany accounts, transactions and balances have been eliminated in consolidation.The financial statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, these financial statements reflect all adjustments considered necessary to fairly state the results for the interim periods shown, including normal recurring accruals and other items. These financial statements, including the consolidated balance sheet as of September 30, 2022, which was derived from audited financial statements, do not include all of the information and notes required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s annual report on Form 10-K for the fiscal year ended September 30, 2022
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates.
Business Combinations Policy	Business Acquisitions In December 2022, the Company acquired the homebuilding operations of Riggins Custom Homes in Northwest Arkansas for approximately $107 million in cash. The assets acquired included approximately 170 homes in inventory, 3,000 lots and a sales order backlog of 100 homes. The purchase price was recorded to inventory and no goodwill was recorded as a result of this transaction. In June 2023, the Company acquired the homebuilding operations of Truland Homes for approximately $100 million in cash. Truland Homes operates in Baldwin County, Alabama and Northwest Florida. The assets acquired included approximately 155 homes in inventory, 620 lots and a sales order backlog of 55 homes. The Company also acquired control of approximately 660 additional lots through land purchase contracts. The Company expects to complete the purchase price allocation in the fourth quarter of fiscal 2023 and does not expect to record any goodwill associated with this acquisition.
Recent Accounting Pronouncements	Pending Accounting Standards In October 2021, the Financial Accounting Standards Board (FASB) issued ASU 2021-08, which requires application of ASC 606, “Revenue from Contracts with Customers,” to recognize and measure contract assets and liabilities from contracts with customers acquired in a business combination. ASU 2021-08 creates an exception to the general recognition and measurement principle in ASC 805 and will result in recognition of contract assets and contract liabilities consistent with those recorded by the acquiree immediately before the acquisition date. The guidance is effective for the Company beginning October 1, 2023, with early adoption permitted. The Company is currently evaluating the impact of this guidance, and it is not expected to have a material impact on its consolidated financial position, results of operations or cash flows.

Basis of Presentation (Policies)

9 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying unaudited, consolidated financial statements include the accounts of D.R. Horton, Inc. and all of its wholly-owned, majority-owned and controlled subsidiaries, which are collectively referred to as the Company, unless the context otherwise requires. Noncontrolling interests represent the proportionate equity interests in consolidated entities that are not 100% owned by the Company. As of June 30, 2023, the Company owned a 63% controlling interest in Forestar Group Inc. (Forestar) and therefore is required to consolidate 100% of Forestar within its consolidated financial statements, and the 37% interest the Company does not own is accounted for as noncontrolling interests. All intercompany accounts, transactions and balances have been eliminated in consolidation.The financial statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, these financial statements reflect all adjustments considered necessary to fairly state the results for the interim periods shown, including normal recurring accruals and other items. These financial statements, including the consolidated balance sheet as of September 30, 2022, which was derived from audited financial statements, do not include all of the information and notes required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s annual report on Form 10-K for the fiscal year ended September 30, 2022

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates.

Business Combinations Policy

Business Acquisitions

In December 2022, the Company acquired the homebuilding operations of Riggins Custom Homes in Northwest Arkansas for approximately $107 million in cash. The assets acquired included approximately 170 homes in inventory, 3,000 lots and a sales order backlog of 100 homes. The purchase price was recorded to inventory and no goodwill was recorded as a result of this transaction.

In June 2023, the Company acquired the homebuilding operations of Truland Homes for approximately $100 million in cash. Truland Homes operates in Baldwin County, Alabama and Northwest Florida. The assets acquired included approximately 155 homes in inventory, 620 lots and a sales order backlog of 55 homes. The Company also acquired control of approximately 660 additional lots through land purchase contracts. The Company expects to complete the purchase price allocation in the fourth quarter of fiscal 2023 and does not expect to record any goodwill associated with this acquisition.

Recent Accounting Pronouncements

Pending Accounting Standards

In October 2021, the Financial Accounting Standards Board (FASB) issued ASU 2021-08, which requires application of ASC 606, “Revenue from Contracts with Customers,” to recognize and measure contract assets and liabilities from contracts with customers acquired in a business combination. ASU 2021-08 creates an exception to the general recognition and measurement principle in ASC 805 and will result in recognition of contract assets and contract liabilities consistent with those recorded by the acquiree immediately before the acquisition date. The guidance is effective for the Company beginning October 1, 2023, with early adoption permitted. The Company is currently evaluating the impact of this guidance, and it is not expected to have a material impact on its consolidated financial position, results of operations or cash flows.