Other Assets and Accrued Expenses and Other Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Homebuilding other assets
Homebuilding other assets	$ 516.4		$ 517.4
Homebuilding [Member]
Homebuilding other assets
Insurance receivables	135.8		162.1	192.8
Earnest money and refundable deposits	110.2		98.5
Accounts and notes receivable	29.7		24.1
Prepaid assets	43.9		49.4
Rental Properties	50.5		41.3
Other Investments	20.8		20.3
Other assets	69.5		64.8
Homebuilding other assets	460.4		460.5
Homebuilding accrued expenses and other liabilities
Construction defect and other litigation liabilities	457.6		482.0	508.3		544.9
Employee compensation and related liabilities	138.0		130.2
Warranty liability	61.3	57.3	56.9	57.2	57.3	56.8
Accrued interest	47.3		34.0
Federal and state income tax liabilities	15.1		29.9
Construction Payable	55.5		46.3
Customer Deposits, Current	52.6		39.3
Accrual for Taxes Other than Income Taxes, Current	18.8		30.0
Other liabilities	33.2		37.4
Homebuilding accrued expenses and other liabilities	$ 879.4		$ 886.0