| Document and Entity Information Document | Nov. 10, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 10, 2020 |
| Entity Registrant Name | D.R. Horton, Inc. |
| Entity Central Index Key | 0000882184 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-14122 |
| Entity Tax Identification Number | 75-2386963 |
| Entity Address, Address Line One | 1341 Horton Circle |
| Entity Address, City or Town | Arlington |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 76011 |
| City Area Code | 817 |
| Local Phone Number | 390-8200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock, par value $.01 per share | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $.01 per share |
| Trading Symbol | DHI |
| Security Exchange Name | NYSE |
| Senior Notes [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 5.750% Senior Notes due 2023 |
| Trading Symbol | DHI 23A |
| Security Exchange Name | NYSE |
