Supplemental Guarantor Information (Details) (USD $) In Millions	Jun. 30, 2011	Sep. 30, 2010	Jun. 30, 2010	Sep. 30, 2009
ASSETS
Cash and cash equivalents	$ 841.0	$ 1,309.3	$ 1,392.5	$ 1,957.3
Marketable securities, available-for-sale	297.1	297.7
Restricted cash	50.4	53.7
Investments in subsidiaries	0	0
Inventories	3,500.8	3,449.0
Income taxes receivable	14.0	16.0
Property and equipment, net	58.9	60.5
Other assets	440.5	482.7
Mortgage loans held for sale	286.2	253.8
Goodwill	15.9	15.9
Intercompany Receivables	0	0
Total assets	5,504.8	5,938.6
LIABILITIES & EQUITY
Accounts payable and other liabilities	1,030.8	1,143.9
Intercompany Payables	0	0
Notes payable	1,880.4	2,171.8
Total liabilities	2,911.2	3,315.7
Total stockholders' equity	2,591.5	2,613.2
Noncontrolling interests	2.1	9.7
Total equity	2,593.6	2,622.9
Total liabilities and equity	5,504.8	5,938.6
D.R Horton, Inc. [Member]
ASSETS
Cash and cash equivalents	793.6	1,234.9	1,302.9	1,871.2
Marketable securities, available-for-sale	297.1	297.7
Restricted cash	49.6	53.3
Investments in subsidiaries	1,411.8	1,316.7
Inventories	1,102.6	1,081.7
Income taxes receivable	14.0	16.0
Property and equipment, net	19.0	18.5
Other assets	95.4	101.1
Mortgage loans held for sale	0	0
Goodwill	0	0
Intercompany Receivables	828.1	904.6
Total assets	4,611.2	5,024.5
LIABILITIES & EQUITY
Accounts payable and other liabilities	258.6	327.9
Intercompany Payables	0	0
Notes payable	1,761.1	2,083.4
Total liabilities	2,019.7	2,411.3
Total stockholders' equity	2,591.5	2,613.2
Noncontrolling interests	0	0
Total equity	2,591.5	2,613.2
Total liabilities and equity	4,611.2	5,024.5
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	27.6	45.3	52.1	48.3
Marketable securities, available-for-sale	0	0
Restricted cash	0.6	0.4
Investments in subsidiaries	0	0
Inventories	2,378.5	2,340.1
Income taxes receivable	0	0
Property and equipment, net	21.9	23.3
Other assets	256.5	292.8
Mortgage loans held for sale	0	0
Goodwill	15.9	15.9
Intercompany Receivables	0	0
Total assets	2,701.0	2,717.8
LIABILITIES & EQUITY
Accounts payable and other liabilities	665.3	688.3
Intercompany Payables	793.2	871.4
Notes payable	3.0	1.9
Total liabilities	1,461.5	1,561.6
Total stockholders' equity	1,239.5	1,156.2
Noncontrolling interests	0	0
Total equity	1,239.5	1,156.2
Total liabilities and equity	2,701.0	2,717.8
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	19.8	29.1	37.5	37.8
Marketable securities, available-for-sale	0	0
Restricted cash	0.2	0
Investments in subsidiaries	0	0
Inventories	19.7	27.2
Income taxes receivable	0	0
Property and equipment, net	18.0	18.7
Other assets	88.6	88.8
Mortgage loans held for sale	286.2	253.8
Goodwill	0	0
Intercompany Receivables	0	0
Total assets	432.5	417.6
LIABILITIES & EQUITY
Accounts payable and other liabilities	106.9	127.7
Intercompany Payables	34.9	33.2
Notes payable	116.3	86.5
Total liabilities	258.1	247.4
Total stockholders' equity	172.3	160.5
Noncontrolling interests	2.1	9.7
Total equity	174.4	170.2
Total liabilities and equity	432.5	417.6
Eliminations [Member]
ASSETS
Cash and cash equivalents	0	0	0	0
Marketable securities, available-for-sale	0	0
Restricted cash	0	0
Investments in subsidiaries	(1,411.8)	(1,316.7)
Inventories	0	0
Income taxes receivable	0	0
Property and equipment, net	0	0
Other assets	0	0
Mortgage loans held for sale	0	0
Goodwill	0	0
Intercompany Receivables	(828.1)	(904.6)
Total assets	(2,239.9)	(2,221.3)
LIABILITIES & EQUITY
Accounts payable and other liabilities	0	0
Intercompany Payables	(828.1)	(904.6)
Notes payable	0	0
Total liabilities	(828.1)	(904.6)
Total stockholders' equity	(1,411.8)	(1,316.7)
Noncontrolling interests	0	0
Total equity	(1,411.8)	(1,316.7)
Total liabilities and equity	$ (2,239.9)	$ (2,221.3)