Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2018	Jan. 23, 2019
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	Dec. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		373,423,120