Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues	$ 4,020.7	$ 3,519.0
Cost of Revenue	3,084.2	2,751.1
Selling, general and administrative expense	455.8	402.8
Gain on sale of assets	(31.1)	(2.0)
Other (income) expense	(11.5)	(8.6)
Income before income taxes	523.3	375.7
Income tax expense	90.8	89.0
Net income	432.5	286.7
Net income (loss) attributable to noncontrolling interests	1.2	(0.5)
Net income attributable to D.R. Horton, Inc.	$ 431.3	$ 287.2
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 1.17	$ 0.77
Weighted average number of common shares	368.3	375.1
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 1.16	$ 0.76
Adjusted weighted average number of common shares	373.4	380.1