Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues	$ 3,332.7		$ 2,904.2
Cost of sales	2,580.1		2,267.9
Selling, general and administrative expense	384.2		325.9
Equity in earnings of unconsolidated entities	(2.3)		0.0
Other (income) expense	(20.5)		(7.7)
Income before income taxes	391.2		318.1
Income tax expense	202.4		111.2
Net income	188.8		206.9
Net loss attributable to noncontrolling interests	(0.5)		0.0
Net income attributable to D.R. Horton, Inc.	$ 189.3		$ 206.9
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 0.50		$ 0.55
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	0.49		0.55
Cash dividends declared per common share (in dollars per share)	$ 0.125	$ 0.10	$ 0.10