Other Assets and Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013
Homebuilding other assets
Homebuilding other assets	$ 526.0		$ 502.7
Homebuilding [Member]
Homebuilding other assets
Insurance receivables	129.6		138.4	$ 135.8
Earnest money and refundable deposits	119.3		113.3
Accounts and notes receivable	40.0		38.6
Prepaid assets	46.9		55.4
Rental Properties	49.5		48.7
Other Investments	35.6		20.8
Other assets	24.5		25.9
Homebuilding other assets	445.4		441.1
Homebuilding accrued expenses and other liabilities
Construction defect and other litigation liabilities	450.7		456.9	457.6		$ 482.0
Employee compensation and related liabilities	152.9		150.8
Warranty liability	77.4	$ 71.6	65.7	$ 61.3	$ 57.3	$ 56.9
Accrued interest	49.7		29.1
Federal and state income tax liabilities	38.1		12.8
Construction Payable	28.5		36.1
Customer Deposits, Current	58.9		49.5
Accrual for Taxes Other than Income Taxes, Current	22.0		29.1
Other liabilities	31.0		45.0
Homebuilding accrued expenses and other liabilities	$ 909.2		$ 875.0