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Fair Value Measurements - Assets and Liabilities Not Reflected at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Carrying value | $ 512.4 | $ 1,303.2 | $ 906.8 | $ 1,383.8
Notes payable, Carrying value | 2,926.5 | 3,271.3 |  |
Homebuilding [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Carrying value | 460.8 | 1,271.8 |  |
Restricted cash, Carrying value | 10.9 | 9.5 |  |
Notes payable, Carrying value | 2,453.1 | 2,798.3 |  |
Homebuilding [Member] | Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Carrying value | 2,439.7 | 2,786.7 |  |
Homebuilding [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Carrying value | 13.4 | 11.6 |  |
Homebuilding [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 460.8 | 1,271.8 |  |
Restricted cash, Fair value | 10.9 | 9.5 |  |
Homebuilding [Member] | Estimate of Fair Value Measurement [Member] | Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 2,583.3 | 2,947.4 |  |
Homebuilding [Member] | Estimate of Fair Value Measurement [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 13.4 | 11.6 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 460.8 | 1,271.8 |  |
Restricted cash, Fair value | 10.9 | 9.5 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 0.0 | 0.0 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 0.0 | 0.0 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 0.0 | 0.0 |  |
Restricted cash, Fair value | 0.0 | 0.0 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 2,583.3 | 2,947.4 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 0.0 | 0.0 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 0.0 | 0.0 |  |
Restricted cash, Fair value | 0.0 | 0.0 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member] | Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 0.0 | 0.0 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, Fair value | 13.4 | 11.6 |  |
Financial Services and Other [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Carrying value | 51.6 | 31.4 |  |
Restricted cash, Carrying Value | 8.5 |  |  |
Mortgage repurchase facility | 473.4 | 473.0 |  |
Financial Services and Other [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 51.6 | 31.4 |  |
Restricted cash, Fair value | 8.5 |  |  |
Mortgage repurchase facility, Fair value | 473.4 | 473.0 |  |
Financial Services and Other [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 51.6 | 31.4 |  |
Restricted cash, Fair value | 8.5 |  |  |
Mortgage repurchase facility, Fair value | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 0.0 | 0.0 |  |
Restricted cash, Fair value | 0.0 |  |  |
Mortgage repurchase facility, Fair value | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, Fair value | 0.0 | 0.0 |  |
Restricted cash, Fair value | 0.0 |  |  |
Mortgage repurchase facility, Fair value | $ 473.4 | $ 473.0 |  |

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- Definition Fair value portion 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. + 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 -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: 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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