Other Assets, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Other assets
Earnest money and refundable deposits	$ 445.2	$ 312.2
Insurance receivables	54.6	74.4
Other receivables	81.7	60.0
Prepaid assets	36.9	30.8
Rental properties	39.2	52.0
Other assets	44.3	36.5
Total other assets	701.9	565.9
Accrued expenses and other liabilities
Reserves for legal claims	408.1	420.6	$ 423.5
Employee compensation and related liabilities	252.5	208.9
Warranty liability	202.0	143.7	$ 104.4
Accrued interest	14.8	12.7
Federal and state income tax liabilities	35.2	20.3
Inventory related accruals	45.5	24.8
Homebuyer deposits	58.1	51.8
Accrued property taxes	38.0	33.9
Other liabilities	73.3	68.3
Total accrued expenses and other liabilities	1,127.5	985.0
Homebuilding [Member]
Other assets
Total other assets	673.7	518.7
Accrued expenses and other liabilities
Total accrued expenses and other liabilities	$ 1,041.3	$ 933.1

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).