Other Assets and Accrued Expenses and Other Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Homebuilding other assets
Rental Properties	$ 41.3	$ 38.7
Homebuilding other assets	517.4	507.3
Homebuilding [Member]
Homebuilding other assets
Insurance receivables	162.1	225.0
Earnest money and refundable deposits	98.5	80.0
Accounts and notes receivable	24.1	21.9
Prepaid assets	49.4	29.4
Other Investments	20.3	0
Other assets	64.8	61.8
Homebuilding other assets	460.5	456.8
Homebuilding accrued expenses and other liabilities
Reserves for legal claims	482.0	544.9	529.6
Employee compensation and related liabilities	130.2	106.4
Warranty liability	56.9	56.8	46.2
Accrued interest	34.0	32.6
Federal and state income tax liabilities	29.9	21.6
Construction Payable	46.3	50.8
Customer Deposits, Current	39.3	24.0
Accrual for Taxes Other than Income Taxes, Current	30.0	21.3
Other liabilities	37.4	35.4
Homebuilding accrued expenses and other liabilities	$ 886.0	$ 893.8