Supplemental Guarantor Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Unaudited Supplemental Consolidating Statement of Operations
Interest expense									$ (7.1)		$ (26.9)		$ (51.9)
Loss (gain) on early retirement of debt, net									0		(0.1)		10.8
Income before income taxes	202.8	205.1	142.1	107.9	99.2	72.2	42.3	29.2	657.8	[1]	242.9	[1]	12.1	[1]
Income Tax Expense (Benefit)	63.3	59.1	31.1	41.6	(0.9)	(715.6)	1.7	1.5	195.1		(713.4)		(59.7)
Net income	139.5	146.0	111.0	66.3	100.1	787.8	40.6	27.7	462.7		956.3		71.8
Comprehensive income									464.4		956.4		71.6
Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									6,085.9		4,236.2		3,549.6
Cost of sales									4,853.5		3,492.4		3,023.3
Gross profit	371.4	349.1	281.2	230.9	232.5	198.3	164.4	148.6	1,232.4		743.8		526.3
Selling, general and administrative expense									649.9		528.7		480.0
Equity in (income) of subsidiaries									0		0		0
Interest expense									5.1		23.6		50.5
Loss (gain) on early retirement of debt, net									0		(0.1)		10.8
Other (income)									(14.9)		(12.1)		(8.0)
Income before income taxes									592.3	[1]	203.7	[1]	(7.0)	[1]
Financial Services [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues, net of recourse and reinsurance expense									173.4		117.8		87.2
General and administrative expense									116.4		85.5		76.3
Interest and other income									(8.5)		(6.9)		(8.2)
Income before income taxes									65.5	[1]	39.2	[1]	19.1	[1]
D.R Horton, Inc. [Member]
Unaudited Supplemental Consolidating Statement of Operations
Income before income taxes									657.8		242.9		12.1
Income Tax Expense (Benefit)									195.1		(713.4)		(59.7)
Net income									462.7		956.3		71.8
Comprehensive income									462.5		956.4		71.6
D.R Horton, Inc. [Member] | Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									1,981.6		1,400.3		1,021.4
Cost of sales									1,563.1		1,130.9		840.1
Gross profit									418.5		269.4		181.3
Selling, general and administrative expense									302.1		243.6		209.3
Equity in (income) of subsidiaries									(542.5)		(235.7)		(98.2)
Interest expense									5.1		23.6		50.5
Loss (gain) on early retirement of debt, net											(0.1)		10.8
Other (income)									(4.0)		(4.9)		(3.2)
Income before income taxes									657.8		242.9		12.1
D.R Horton, Inc. [Member] | Financial Services [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues, net of recourse and reinsurance expense									0		0		0
General and administrative expense									0		0		0
Interest and other income									0		0		0
Income before income taxes									0		0		0
Guarantor Subsidiaries [Member]
Unaudited Supplemental Consolidating Statement of Operations
Income before income taxes									476.8		211.2		78.1
Income Tax Expense (Benefit)									126.9		(463.4)		(41.4)
Net income									349.9		674.6		119.5
Comprehensive income									351.8		674.6		119.5
Guarantor Subsidiaries [Member] | Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									4,094.1		2,828.0		2,516.4
Cost of sales									3,279.9		2,341.5		2,169.3
Gross profit									814.2		486.5		347.1
Selling, general and administrative expense									341.1		277.5		270.1
Equity in (income) of subsidiaries									0		0		0
Interest expense									0		0		0
Loss (gain) on early retirement of debt, net											0		0
Other (income)									(3.7)		(2.2)		(1.1)
Income before income taxes									476.8		211.2		78.1
Guarantor Subsidiaries [Member] | Financial Services [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues, net of recourse and reinsurance expense									0		0		0
General and administrative expense									0		0		0
Interest and other income									0		0		0
Income before income taxes									0		0		0
Non-Guarantor Subsidiaries [Member]
Unaudited Supplemental Consolidating Statement of Operations
Income before income taxes									65.7		24.5		20.1
Income Tax Expense (Benefit)									18.7		(20.6)		(1.5)
Net income									47.0		45.1		21.6
Comprehensive income									47.0		45.1		21.6
Non-Guarantor Subsidiaries [Member] | Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									10.2		7.9		11.8
Cost of sales									10.5		20.0		13.9
Gross profit									(0.3)		(12.1)		(2.1)
Selling, general and administrative expense									6.7		7.6		0.6
Equity in (income) of subsidiaries									0		0		0
Interest expense									0		0		0
Loss (gain) on early retirement of debt, net											0		0
Other (income)									(7.2)		(5.0)		(3.7)
Income before income taxes									0.2		(14.7)		1.0
Non-Guarantor Subsidiaries [Member] | Financial Services [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues, net of recourse and reinsurance expense									173.4		117.8		87.2
General and administrative expense									116.4		85.5		76.3
Interest and other income									(8.5)		6.9		(8.2)
Income before income taxes									65.5		39.2		19.1
Eliminations [Member]
Unaudited Supplemental Consolidating Statement of Operations
Income before income taxes									(542.5)		(235.7)		(98.2)
Income Tax Expense (Benefit)									(145.6)		484.0		42.9
Net income									(396.9)		(719.7)		(141.1)
Comprehensive income									(396.9)		(719.7)		(141.1)
Eliminations [Member] | Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									0		0		0
Cost of sales									0		0		0
Gross profit									0		0		0
Selling, general and administrative expense									0		0		0
Equity in (income) of subsidiaries									542.5		235.7		98.2
Interest expense									0		0		0
Loss (gain) on early retirement of debt, net											0		0
Other (income)									0		0		0
Income before income taxes									(542.5)		(235.7)		(98.2)
Eliminations [Member] | Financial Services [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues, net of recourse and reinsurance expense									0		0		0
General and administrative expense									0		0		0
Interest and other income									0		0		0
Income before income taxes									$ 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 interest expense and those expenses associated with the corporate office are allocated to each segment based on the segment’s inventory balances.