Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2020	Nov. 12, 2020	Mar. 31, 2020
Entity Information [Line Items]
Entity Incorporation, State or Country Code	DE
Document Transition Report	false
Document Annual Report	true
Entity Registrant Name	D.R. Horton, Inc.
Entity Central Index Key	0000882184
Document Type	10-K
Entity File Number	1-14122
Document Period End Date	Sep. 30, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 11.5
Entity Common Stock, Shares Outstanding		364,390,995
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
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Common Stock [Member]
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 due 2023 [Member]
Entity Information [Line Items]
Title of 12(b) Security	5.750% Senior Notes due 2023
Trading Symbol	DHI 23A
Security Exchange Name	NYSE