Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues	$ 8,788.1	$ 7,284.6	$ 23,840.6	$ 19,664.9
Cost of sales	5,879.3	5,212.6	16,214.9	14,196.0
Selling, general and administrative expense	740.6	655.7	2,101.6	1,863.2
Gain on sale of assets	0.0	0.0	0.0	(14.0)
Loss on extinguishment of debt	0.0	(18.1)	0.0	(18.1)
Other (income) expense	(15.1)	(17.4)	(39.8)	(28.2)
Income before income taxes	2,183.3	1,415.6	5,563.9	3,629.8
Income tax expense	524.0	299.1	1,316.5	784.1
Net income	1,659.3	1,116.5	4,247.4	2,845.7
Net income attributable to noncontrolling interests	11.5	1.0	21.7	8.9
Net income attributable to D.R. Horton, Inc.	$ 1,647.8	$ 1,115.5	$ 4,225.7	$ 2,836.8
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 4.70	$ 3.10	$ 11.96	$ 7.83
Weighted average number of common shares	350.8	359.7	353.3	362.2
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 4.67	$ 3.06	$ 11.85	$ 7.73
Adjusted weighted average number of common shares	353.1	364.0	356.5	367.1