Supplemental Guarantor Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Unaudited Supplemental Consolidating Statement of Operations
Interest expense									$ 0		$ 7.1		$ 26.9
Income before income taxes	250.8	171.8	201.9	189.7	202.8	205.1	142.1	107.9	814.2	[1]	657.8	[1]	242.9	[1]
Income Tax Expense (Benefit)	84.5	58.7	70.9	66.5	63.3	59.1	31.1	41.6	280.7		195.1		(713.4)
Net income	166.3	113.1	131.0	123.2	139.5	146.0	111.0	66.3	533.5		462.7		956.3
Comprehensive income									533.8		464.4		956.4
Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									7,858.5		6,085.9		4,236.2
Cost of sales									6,268.6		4,853.5		3,492.4
Gross profit	473.7	377.4	376.8	362.0	371.4	349.1	281.2	230.9	1,589.9		1,232.4		743.8
Selling, general and administrative expense									834.2		649.9		528.7
Equity in (income) of subsidiaries									0		0		0
Interest expense									0		5.1		23.6
Other (income)									(13.1)		(14.9)		(12.2)
Income before income taxes									768.8	[1]	592.3	[1]	203.7	[1]
Financial Services [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues, net of recourse and reinsurance expense									166.4		173.4		117.8
General and administrative expense									131.2		116.4		85.5
Interest and other income									(10.2)		(8.5)		(6.9)
Income before income taxes									45.4	[1]	65.5	[1]	39.2	[1]
D.R Horton, Inc. [Member]
Unaudited Supplemental Consolidating Statement of Operations
Income before income taxes									814.2		657.8		242.9
Income Tax Expense (Benefit)									280.7		195.1		(713.4)
Net income									533.5		462.7		956.3
Comprehensive income									533.5		462.5		956.4
D.R Horton, Inc. [Member] | Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									2,547.4		1,981.6		1,400.3
Cost of sales									2,038.0		1,563.1		1,130.9
Gross profit									509.4		418.5		269.4
Selling, general and administrative expense									388.3		302.1		243.6
Equity in (income) of subsidiaries									(691.8)		(542.5)		(235.7)
Interest expense											5.1		23.6
Other (income)									(1.3)		(4.0)		(5.0)
Income before income taxes									814.2		657.8		242.9
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									647.7		476.8		211.2
Income Tax Expense (Benefit)									222.1		126.9		(463.4)
Net income									425.6		349.9		674.6
Comprehensive income									425.9		351.8		674.6
Guarantor Subsidiaries [Member] | Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									5,299.9		4,094.1		2,828.0
Cost of sales									4,222.5		3,279.9		2,341.5
Gross profit									1,077.4		814.2		486.5
Selling, general and administrative expense									433.0		341.1		277.5
Equity in (income) of subsidiaries									0		0		0
Interest expense											0		0
Other (income)									(3.3)		(3.7)		(2.2)
Income before income taxes									647.7		476.8		211.2
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									44.1		65.7		24.5
Income Tax Expense (Benefit)									16.6		18.7		(20.6)
Net income									27.5		47.0		45.1
Comprehensive income									27.5		47.0		45.1
Non-Guarantor Subsidiaries [Member] | Homebuilding [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues									11.2		10.2		7.9
Cost of sales									8.1		10.5		20.0
Gross profit									3.1		(0.3)		(12.1)
Selling, general and administrative expense									12.9		6.7		7.6
Equity in (income) of subsidiaries									0		0		0
Interest expense											0		0
Other (income)									(8.5)		(7.2)		(5.0)
Income before income taxes									(1.3)		0.2		(14.7)
Non-Guarantor Subsidiaries [Member] | Financial Services [Member]
Unaudited Supplemental Consolidating Statement of Operations
Revenues, net of recourse and reinsurance expense									166.4		173.4		117.8
General and administrative expense									131.2		116.4		85.5
Interest and other income									(10.2)		(8.5)		(6.9)
Income before income taxes									45.4		65.5		39.2
Eliminations [Member]
Unaudited Supplemental Consolidating Statement of Operations
Income before income taxes									(691.8)		(542.5)		(235.7)
Income Tax Expense (Benefit)									(238.7)		(145.6)		484.0
Net income									(453.1)		(396.9)		(719.7)
Comprehensive income									(453.1)		(396.9)		(719.7)
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									691.8		542.5		235.7
Interest expense											0		0
Other (income)									0		0		0
Income before income taxes									(691.8)		(542.5)		(235.7)
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 those expenses associated with the corporate office are allocated to each segment based on the segment’s inventory balances.