Other Assets and Accrued Expenses and Other Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Homebuilding other assets
Rental Properties	$ 48.7	$ 41.3
Homebuilding other assets	502.7	476.5
Homebuilding [Member]
Homebuilding other assets
Insurance receivables	138.4	162.1
Earnest money and refundable deposits	113.3	98.5
Accounts and notes receivable	38.6	24.1
Prepaid assets	55.4	49.4
Other Investments	20.8	20.3
Other assets	25.9	23.9
Homebuilding other assets	441.1	419.6
Homebuilding accrued expenses and other liabilities
Reserves for legal claims	456.9	482.0	544.9
Employee compensation and related liabilities	150.8	130.2
Warranty liability	65.7	56.9	56.8
Accrued interest	29.1	34.0
Federal and state income tax liabilities	12.8	29.9
Construction Payable	36.1	46.3
Customer Deposits, Current	49.5	39.3
Accrual for Taxes Other than Income Taxes, Current	29.1	30.0
Other liabilities	45.0	37.4
Homebuilding accrued expenses and other liabilities	$ 875.0	$ 886.0