Other Assets and Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Homebuilding other assets
Homebuilding other assets	$ 573.1	$ 499.6
Homebuilding [Member]
Homebuilding other assets
Earnest money and refundable deposits	303.1	219.7
Insurance receivables	74.4	88.7
Accounts and notes receivable	38.3	35.9
Prepaid assets	30.8	29.5
Rental properties	52.0	56.9
Other assets	20.1	25.5
Homebuilding other assets	518.7	456.2
Homebuilding accrued expenses and other liabilities
Reserves for legal claims	420.6	423.5	$ 451.0
Employee compensation and related liabilities	192.9	183.3
Warranty liability	143.7	104.4	$ 82.0
Accrued interest	11.9	17.9
Federal and state income tax liabilities	20.3	28.1
Inventory related accruals	24.8	31.9
Homebuyer deposits	44.9	54.2
Accrued property taxes	33.5	35.2
Other liabilities	40.5	38.6
Homebuilding accrued expenses and other liabilities	$ 933.1	$ 917.1

Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

Name:	us-gaap_AccountsAndNotesReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).