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Fair Value Measurements - Carrying Value and Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 1,007.8 | $ 1,303.2 | $ 1,383.8 | $ 661.8
Notes payable, carrying value | 2,871.6 | 3,271.3 |  |
Homebuilding [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 973.0 | 1,271.8 |  |
Restricted cash, carrying value | 9.3 | 9.5 |  |
Notes payable, carrying value | 2,451.6 | 2,798.3 |  |
Homebuilding [Member] | Senior notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, carrying value | 2,440.5 | 2,786.7 |  |
Homebuilding [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, carrying value | 11.1 | 11.6 |  |
Financial Services [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 34.8 | 31.4 |  |
Restricted cash, carrying value | 7.2 |  |  |
Mortgage repurchase facility | 420.0 | 473.0 |  |
Level 1 [Member] | Homebuilding [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 973.0 | 1,271.8 |  |
Other Assets, Fair Value Disclosure | 9.3 | 9.5 |  |
Level 1 [Member] | Homebuilding [Member] | Senior notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 0.0 | 0.0 |  |
Level 1 [Member] | Homebuilding [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 0.0 | 0.0 |  |
Level 1 [Member] | Financial Services [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 34.8 | 31.4 |  |
Other Assets, Fair Value Disclosure | 7.2 |  |  |
Mortgage repurchase facility, fair value | 0.0 | 0.0 |  |
Level 2 [Member] | Homebuilding [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 0.0 | 0.0 |  |
Other Assets, Fair Value Disclosure | 0.0 | 0.0 |  |
Level 2 [Member] | Homebuilding [Member] | Senior notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 2,584.1 | 2,947.4 |  |
Level 2 [Member] | Homebuilding [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 0.0 | 0.0 |  |
Level 2 [Member] | Financial Services [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 0.0 | 0.0 |  |
Other Assets, Fair Value Disclosure | 0.0 |  |  |
Mortgage repurchase facility, fair value | 0.0 | 0.0 |  |
Level 3 [Member] | Homebuilding [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 0.0 | 0.0 |  |
Other Assets, Fair Value Disclosure | 0.0 | 0.0 |  |
Level 3 [Member] | Homebuilding [Member] | Senior notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 0.0 | 0.0 |  |
Level 3 [Member] | Homebuilding [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 11.1 | 11.6 |  |
Level 3 [Member] | Financial Services [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 0.0 | 0.0 |  |
Other Assets, Fair Value Disclosure | 0.0 |  |  |
Mortgage repurchase facility, fair value | 420.0 | 473.0 |  |
Estimate fair value [Member] | Homebuilding [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 973.0 | 1,271.8 |  |
Other Assets, Fair Value Disclosure | 9.3 | 9.5 |  |
Estimate fair value [Member] | Homebuilding [Member] | Senior notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 2,584.1 | 2,947.4 |  |
Estimate fair value [Member] | Homebuilding [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Notes payable, fair value | 11.1 | 11.6 |  |
Estimate fair value [Member] | Financial Services [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, fair value | 34.8 | 31.4 |  |
Other Assets, Fair Value Disclosure | 7.2 |  |  |
Mortgage repurchase facility, fair value | $ 420.0 | $ 473.0 |  |

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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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 -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: 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=98514028&loc=d3e3044-108585 Reference 3: 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 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 Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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 -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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)(2)) -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 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: 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=98514028&loc=d3e3044-108585 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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