Other Assets and Accrued Expenses and Other Liabilities (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Homebuilding other assets
Homebuilding other assets	$ 449.4	$ 482.7
Homebuilding [Member]
Homebuilding other assets
Insurance receivables	218.3	251.5
Accounts and notes receivable	19.1	18.5
Prepaid assets	24.7	28.9
Other assets	136.3	135.9
Homebuilding other assets	398.4	434.8
Homebuilding accrued expenses and other liabilities
Construction defect and other litigation liabilities	529.6	571.3
Employee compensation and related liabilities	85.8	90.4
Warranty liability	46.2	46.2	59.6
Accrued interest	25.3	39.8
Federal and state income tax liabilities	22.5	83.8
Other liabilities	120.4	125.7
Homebuilding accrued expenses and other liabilities	$ 829.8	$ 957.2