Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2019	Jan. 22, 2020
Entity Information [Line Items]
Entity Registrant Name	HORTON D R INC /DE/
Entity Filer Category	Large Accelerated Filer
Entity Incorporation, State or Country Code	DE
Document Transition Report	false
Document Quarterly Report	true
Document Type	10-Q
Document Period End Date	Dec. 31, 2019
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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		366,363,723
Entity Central Index Key	0000882184
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--09-30
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