Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2016	Apr. 20, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	HORTON D R INC /DE/
Entity Central Index Key	0000882184
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		370,925,400