Supplemental Guarantor Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Homebuilding:
Interest expense	$ 0		$ 0		$ 0		$ 7.1
Financial Services [Abstract]
Interest expense	0		0		0		7.1
Income (loss) before income taxes	171.8	[1]	205.1	[1]	563.4	[1]	455.1	[1]
Income tax expense (benefit)	58.7		59.1		196.1		131.9
Net income	113.1		146.0		367.3		323.2
Comprehensive income	113.1		147.9		367.6		324.9
Homebuilding [Member]
Homebuilding:
Revenues	2,102.9		1,644.5		5,435.1		4,268.1
Cost of sales	1,725.5		1,295.4		4,318.9		3,407.0
Gross profit	377.4		349.1		1,116.2		861.1
Selling, general and administrative expense	221.9		167.5		593.2		463.3
Equity in (income) of subsidiaries	0		0		0		0
Interest expense	0		0		0		5.1
Other (income)	(3.1)		(3.8)		(9.2)		(10.3)
Financial Services [Abstract]
Interest expense	0		0		0		5.1
Income (loss) before income taxes	158.6	[1]	185.4	[1]	532.2	[1]	403.0	[1]
Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	44.1		48.3		117.4		131.3
General and administrative expense	33.8		31.3		93.7		84.9
Interest and other (income)	(2.9)		(2.7)		(7.5)		(5.7)
Income (loss) before income taxes	13.2	[1]	19.7	[1]	31.2	[1]	52.1	[1]
D.R. Horton, Inc. [Member]
Financial Services [Abstract]
Income (loss) before income taxes	171.8		205.1		563.4		455.1
Income tax expense (benefit)	58.7		59.1		196.1		131.9
Net income	113.1		146.0		367.3		323.2
Comprehensive income	113.1		146.0		367.3		323.0
D.R. Horton, Inc. [Member] | Homebuilding [Member]
Homebuilding:
Revenues	653.8		534.1		1,780.0		1,381.7
Cost of sales	523.2		412.7		1,406.1		1,094.3
Gross profit	130.6		121.4		373.9		287.4
Selling, general and administrative expense	102.3		78.3		279.4		217.8
Equity in (income) of subsidiaries	(143.2)		(161.4)		(467.8)		(388.6)
Interest expense							5.1
Other (income)	(0.3)		(0.6)		(1.1)		(2.0)
Financial Services [Abstract]
Interest expense							5.1
Income (loss) before income taxes	171.8		205.1		563.4		455.1
D.R. Horton, Inc. [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	0		0		0		0
General and administrative expense	0		0		0		0
Interest and other (income)	0		0		0		0
Income (loss) before income taxes	0		0		0		0
Guarantor Subsidiaries [Member]
Financial Services [Abstract]
Income (loss) before income taxes	131.6		143.3		438.9		341.0
Income tax expense (benefit)	44.9		38.7		152.8		86.3
Net income	86.7		104.6		286.1		254.7
Comprehensive income	86.7		106.5		286.4		256.6
Guarantor Subsidiaries [Member] | Homebuilding [Member]
Homebuilding:
Revenues	1,445.5		1,107.6		3,645.4		2,878.2
Cost of sales	1,198.8		878.4		2,903.3		2,300.3
Gross profit	246.7		229.2		742.1		577.9
Selling, general and administrative expense	116.0		87.4		306.0		240.7
Equity in (income) of subsidiaries	0		0		0		0
Interest expense							0
Other (income)	(0.9)		(1.5)		(2.8)		(3.8)
Financial Services [Abstract]
Interest expense							0
Income (loss) before income taxes	131.6		143.3		438.9		341.0
Guarantor Subsidiaries [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	0		0		0		0
General and administrative expense	0		0		0		0
Interest and other (income)	0		0		0		0
Income (loss) before income taxes	0		0		0		0
Non-Guarantor Subsidiaries [Member]
Financial Services [Abstract]
Income (loss) before income taxes	11.6		18.1		28.9		47.6
Income tax expense (benefit)	4.1		1.9		10.1		4.2
Net income	7.5		16.2		18.8		43.4
Comprehensive income	7.5		16.2		18.8		43.4
Non-Guarantor Subsidiaries [Member] | Homebuilding [Member]
Homebuilding:
Revenues	3.6		2.8		9.7		8.2
Cost of sales	3.5		4.3		9.5		12.4
Gross profit	0.1		(1.5)		0.2		(4.2)
Selling, general and administrative expense	3.6		1.8		7.8		4.8
Equity in (income) of subsidiaries	0		0		0		0
Interest expense							0
Other (income)	(1.9)		(1.7)		(5.3)		(4.5)
Financial Services [Abstract]
Interest expense							0
Income (loss) before income taxes	(1.6)		(1.6)		(2.3)		(4.5)
Non-Guarantor Subsidiaries [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	44.1		48.3		117.4		131.3
General and administrative expense	33.8		31.3		93.7		84.9
Interest and other (income)	(2.9)		(2.7)		(7.5)		(5.7)
Income (loss) before income taxes	13.2		19.7		31.2		52.1
Eliminations [Member]
Financial Services [Abstract]
Income (loss) before income taxes	(143.2)		(161.4)		(467.8)		(388.6)
Income tax expense (benefit)	(49.0)		(40.6)		(162.9)		(90.5)
Net income	(94.2)		(120.8)		(304.9)		(298.1)
Comprehensive income	(94.2)		(120.8)		(304.9)		(298.1)
Eliminations [Member] | Homebuilding [Member]
Homebuilding:
Revenues	0		0		0		0
Cost of sales	0		0		0		0
Gross profit	0		0		0		0
Selling, general and administrative expense	0		0		0		0
Equity in (income) of subsidiaries	143.2		161.4		467.8		388.6
Interest expense							0
Other (income)	0		0		0		0
Financial Services [Abstract]
Interest expense							0
Income (loss) before income taxes	(143.2)		(161.4)		(467.8)		(388.6)
Eliminations [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	0		0		0		0
General and administrative expense	0		0		0		0
Interest and other (income)	0		0		0		0
Income (loss) before income taxes	$ 0		$ 0		$ 0		$ 0

[1] Expenses maintained at the corporate level consist primarily of interest and property taxes, which are capitalized and amortized to cost of sales or expensed directly, and the expenses related to operating the Company’s corporate office. The amortization of capitalized interest and property taxes is allocated to each segment based on the segment’s revenue, while those expenses associated with the corporate office are allocated to each segment based on the segment’s inventory balances.