Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Sep. 30, 2012		Dec. 31, 2011	Sep. 30, 2011
ASSETS
Cash and cash equivalents	$ 566.9		$ 1,047.7		$ 738.1	$ 732.6
Marketable securities, available-for-sale	96.7		298.0
Inventories	5,015.1		4,165.2
Other assets	501.6		507.3
Total assets	7,347.3		7,248.2
LIABILITIES & EQUITY
Accounts payable and other liabilities	1,140.5		1,160.4
Notes payable	2,593.7		2,493.1
Total liabilities	3,734.2		3,653.5
Total stockholders' equity	3,610.4		3,592.1
Noncontrolling interests	2.7		2.6
Total equity	3,613.1		3,594.7
Total liabilities and equity	7,347.3		7,248.2
D.R. Horton, Inc. [Member]
ASSETS
Cash and cash equivalents	526.6		968.9		702.7	681.3
Marketable securities, available-for-sale	96.7		298.0
Restricted cash	54.0		48.7
Investments in subsidiaries	2,157.4		2,120.8
Inventories	1,651.4		1,375.1
Income Taxes Receivable			14.4
Deferred income taxes	220.1		227.6
Property and equipment, net	25.4		20.7
Other assets	126.8		127.8
Intercompany receivables	1,480.7		1,022.6
Total assets	6,339.1		6,224.6
LIABILITIES & EQUITY
Accounts payable and other liabilities	306.8		329.8
Notes payable	2,421.9		2,302.7
Total liabilities	2,728.7		2,632.5
Total stockholders' equity	3,610.4		3,592.1
Total equity	3,610.4		3,592.1
Total liabilities and equity	6,339.1		6,224.6
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	18.9		56.3		14.8	31.3
Restricted cash	0.7		0.5
Inventories	3,345.7		2,770.6
Deferred income taxes	463.4		481.9
Property and equipment, net	27.5		20.7
Other assets	270.1		271.1
Goodwill	38.9		38.9
Total assets	4,165.2		3,640.0
LIABILITIES & EQUITY
Accounts payable and other liabilities	705.2		700.0
Intercompany payables	1,450.3		986.8
Notes payable	2.4		2.6
Total liabilities	2,157.9		1,689.4
Total stockholders' equity	2,007.3		1,950.6
Total equity	2,007.3		1,950.6
Total liabilities and equity	4,165.2		3,640.0
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	21.4		22.5		20.6	20.0
Restricted cash	0.1		0.1
Inventories	18.0		19.5
Property and equipment, net	29.0		31.2
Other assets	104.7		108.4
Mortgage loans held for sale	307.9		345.3
Total assets	481.1		527.0
LIABILITIES & EQUITY
Accounts payable and other liabilities	128.5		130.6
Intercompany payables	30.4		35.8
Notes payable	169.4		187.8
Total liabilities	328.3		354.2
Total stockholders' equity	150.1		170.2
Noncontrolling interests	2.7		2.6
Total equity	152.8		172.8
Total liabilities and equity	481.1		527.0
Eliminations [Member]
ASSETS
Investments in subsidiaries	(2,157.4)		(2,120.8)
Intercompany receivables	(1,480.7)		(1,022.6)
Total assets	(3,638.1)		(3,143.4)
LIABILITIES & EQUITY
Intercompany payables	(1,480.7)		(1,022.6)
Total liabilities	(1,480.7)		(1,022.6)
Total stockholders' equity	(2,157.4)		(2,120.8)
Total equity	(2,157.4)		(2,120.8)
Total liabilities and equity	(3,638.1)		(3,143.4)
Homebuilding [Member]
ASSETS
Cash and cash equivalents	546.4		1,030.4
Marketable securities, available-for-sale	96.7
Restricted cash	54.8		49.3
Inventories	5,015.1	[1]	4,165.2	[1]
Income Taxes Receivable	0		14.4
Deferred income taxes	683.5		709.5
Property and equipment, net	81.9		72.6
Other assets	454.2		456.8
Goodwill	38.9		38.9
Total assets	6,971.5		6,835.1
LIABILITIES & EQUITY
Notes payable	2,424.3		2,305.3
Total liabilities	$ 3,522.7		$ 3,415.3

[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.