Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2015	Nov. 10, 2015	Mar. 31, 2015	Sep. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	HORTON D R INC /DE/
Entity Central Index Key	0000882184
Document Type	10-K
Document Period End Date	Sep. 30, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
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 Filer Category	Large Accelerated Filer
Entity Public Float			$ 9,652,171,000
Common Stock, Shares, Issued	375,847,442			371,786,765
Entity Common Stock, Shares Outstanding		368,702,046