Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenues	$ 9,725.6	$ 8,788.1	$ 24,956.4	$ 23,840.6
Cost of sales	7,141.8	5,879.3	18,429.3	16,214.9
Selling, general and administrative expense	852.1	740.6	2,362.6	2,101.6
Other (income) expense	(52.2)	(15.1)	(131.9)	(39.8)
Income before income taxes	1,783.9	2,183.3	4,296.4	5,563.9
Income tax expense	432.2	524.0	1,026.7	1,316.5
Net income	1,351.7	1,659.3	3,269.7	4,247.4
Net income attributable to noncontrolling interests	16.6	11.5	33.7	21.7
Net income attributable to D.R. Horton, Inc.	$ 1,335.1	$ 1,647.8	$ 3,236.0	$ 4,225.7
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 3.93	$ 4.70	$ 9.46	$ 11.96
Weighted average number of common shares	339.9	350.8	342.1	353.3
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 3.90	$ 4.67	$ 9.39	$ 11.85
Adjusted weighted average number of common shares	342.3	353.1	344.7	356.5