Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2021	Nov. 11, 2021	Mar. 31, 2021
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2021
Current Fiscal Year End Date	--09-30
Document Transition Report	false
Entity File Number	1-14122
Entity Registrant Name	D.R. Horton, Inc.
Entity Incorporation, State or Country Code	DE
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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 32.0
Entity Common Stock, Shares Outstanding		356,529,507
Entity Central Index Key	0000882184
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
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