Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Sep. 30, 2011		Jun. 30, 2011	Sep. 30, 2010
ASSETS
Cash and cash equivalents	$ 904.9		$ 732.6		$ 841.0	$ 1,309.3
Marketable securities, available-for-sale	283.7		297.6
Other assets	458.0		449.4
Total assets	6,657.0		5,358.4
LIABILITIES & EQUITY
Accounts payable and other liabilities	1,070.1		1,030.3
Notes payable	2,095.3		1,704.6
Total liabilities	3,165.4		2,734.9
Total stockholders' equity	3,488.7		2,620.6
Noncontrolling interests	2.9		2.9
Total equity	3,491.6		2,623.5
Total liabilities and equity	6,657.0		5,358.4
D.R. Horton, Inc. [Member]
ASSETS
Cash and cash equivalents	831.8		681.3		793.6	1,234.9
Marketable securities, available-for-sale	283.7		297.6
Restricted cash	40.9		48.7
Investments in subsidiaries	2,044.7		1,452.3
Inventories	1,243.8		1,100.6
Income taxes receivable	12.9		12.4
Deferred income taxes	235.5
Property and equipment, net	15.7		18.0
Other assets	107.2		98.7
Intercompany receivables	900.2		748.3
Total assets	5,716.4		4,457.9
LIABILITIES & EQUITY
Accounts payable and other liabilities	283.2		252.3
Notes payable	1,944.5		1,585.0
Total liabilities	2,227.7		1,837.3
Total stockholders' equity	3,488.7		2,620.6
Total equity	3,488.7		2,620.6
Total liabilities and equity	5,716.4		4,457.9
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	47.6		31.3		27.6	45.3
Restricted cash	0.5		0.4
Inventories	2,598.4		2,329.6
Deferred income taxes	481.2
Property and equipment, net	19.8		21.7
Other assets	262.9		259.2
Goodwill	15.9		15.9
Total assets	3,426.3		2,658.1
LIABILITIES & EQUITY
Accounts payable and other liabilities	671.5		662.7
Intercompany payables	875.9		717.6
Notes payable	4.0		3.1
Total liabilities	1,551.4		1,383.4
Total stockholders' equity	1,874.9		1,274.7
Total equity	1,874.9		1,274.7
Total liabilities and equity	3,426.3		2,658.1
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	25.5		20.0		19.8	29.1
Restricted cash	0.1
Inventories	19.4		19.5
Property and equipment, net	31.2		17.9
Other assets	87.9		91.5
Mortgage loans held for sale	295.1		294.1
Total assets	459.2		443.0
LIABILITIES & EQUITY
Accounts payable and other liabilities	115.4		115.3
Intercompany payables	24.3		30.7
Notes payable	146.8		116.5
Total liabilities	286.5		262.5
Total stockholders' equity	169.8		177.6
Noncontrolling interests	2.9		2.9
Total equity	172.7		180.5
Total liabilities and equity	459.2		443.0
Eliminations [Member]
ASSETS
Investments in subsidiaries	(2,044.7)		(1,452.3)
Intercompany receivables	(900.2)		(748.3)
Total assets	(2,944.9)		(2,200.6)
LIABILITIES & EQUITY
Intercompany payables	(900.2)		(748.3)
Total liabilities	(900.2)		(748.3)
Total stockholders' equity	(2,044.7)		(1,452.3)
Total equity	(2,044.7)		(1,452.3)
Total liabilities and equity	(2,944.9)		(2,200.6)
Homebuilding [Member]
ASSETS
Cash and cash equivalents	884.3		715.5
Marketable securities, available-for-sale	283.7		297.6
Restricted cash	41.5		49.1
Inventories	3,861.6	[1]	3,449.7	[1]
Income taxes receivable	12.9		12.4
Deferred income taxes	716.7		0
Property and equipment, net	66.7		57.6
Other assets	412.1		398.4
Goodwill	15.9		15.9
Total assets	6,295.4		4,996.2
LIABILITIES & EQUITY
Notes payable	1,948.6		1,588.1
Total liabilities	2,977.2		2,571.9
Financial Services [Member]
ASSETS
Cash and cash equivalents	20.6		17.1
Other assets	45.9		51.0
Mortgage loans held for sale	295.1		294.1
Total assets	361.6		362.2
LIABILITIES & EQUITY
Total liabilities	$ 188.2		$ 163.0

[1] Homebuilding inventories are the only assets included in the measure of segment assets used by the Company’s chief operating decision maker, its CEO.