Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 5,390.0	$ 4,906.3	$ 13,910.8	$ 12,554.0
Cost of Revenue	4,084.7	3,831.6	10,619.7	9,839.4
Selling, general and administrative expense	527.5	480.0	1,450.1	1,327.0
Gain on sale of assets	0.0	(22.6)	(59.5)	(53.9)
Other (income) expense	(4.6)	(9.4)	(26.4)	(23.7)
Income before income taxes	782.4	626.7	1,926.9	1,465.2
Income tax expense	149.5	153.1	377.6	350.5
Net income	632.9	473.6	1,549.3	1,114.7
Net income (loss) attributable to noncontrolling interests	2.2	(1.2)	4.6	1.5
Net income attributable to D.R. Horton, Inc.	$ 630.7	$ 474.8	$ 1,544.7	$ 1,113.2
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 1.73	$ 1.28	$ 4.22	$ 2.98
Weighted average number of common shares	363.8	372.3	366.0	373.5
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 1.72	$ 1.26	$ 4.17	$ 2.94
Adjusted weighted average number of common shares	367.7	376.9	370.4	378.2