| Document and Entity Information | May 01, 2020 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | HORTON D R INC /DE/ |
| Amendment Flag | false |
| Entity Central Index Key | 0000882184 |
| Document Type | 8-K |
| Document Period End Date | May 1, 2020 |
| Entity Incorporation State 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 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, par value $.01 per share |
| Trading Symbol | DHI |
| Security Exchange Name | NYSE |
| Senior Notes [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 5.750% Senior Notes due 2023 |
| Trading Symbol | DHI 23A |
| Security Exchange Name | NYSE |
