Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenues	$ 7,726.0	$ 7,257.8
Cost of sales	5,719.8	5,291.3
Selling, general and administrative expense	835.0	737.0
Other (income) expense	(76.3)	(37.7)
Income before income taxes	1,247.5	1,267.2
Income tax expense	291.8	298.9
Net income	955.7	968.3
Net income attributable to noncontrolling interests	8.3	9.6
Net income attributable to D.R. Horton, Inc.	$ 947.4	$ 958.7
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 2.84	$ 2.79
Weighted average number of common shares	333.3	344.2
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 2.82	$ 2.76
Adjusted weighted average number of common shares	335.7	346.9