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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Business Information [Line Items] |  |  |  |
Property, Plant and Equipment, Net | $ 195.4 | $ 146.9 |  |
Other Assets | 499.6 | 527.3 |  |
Cash and cash equivalents | 1,303.2 | 1,383.8 | $ 661.8 | $ 977.4
Deferred profit on sales | 3.6 | 2.0 |  |
Advertising expense | 41.2 | 42.4 | 44.0 |
Other Segments [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Property, Plant and Equipment, Net |  | 19.2 |  |
Other Assets |  | 1.2 |  |
Cash and cash equivalents |  | 1.1 |  |
Other Accounts Payable and Accrued Liabilities |  | 1.8 |  |
General and Administrative Expense |  | 10.6 | 7.3 |
Other Operating Income |  | 10.6 | $ 7.6 |
Homebuilding [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Property, Plant and Equipment, Net | 139.5 | 124.8 |  |
Other Assets | 456.2 | 455.0 |  |
Cash and cash equivalents | 1,271.8 | 1,354.8 |  |
Earnest Money Deposits | 167.0 |  |  |
Homebuilding [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Earnest Money Deposits | 149.5 | 74.4 |  |
Subsidiaries [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Cash and cash equivalents | $ 40.5 | $ 40.5 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price. + References No definition available. + Details
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