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Fair Value Measurement (Details 2) - USD ($) $ in Millions | Jun. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Carrying value |  | $ 906.8 | $ 1,383.8 | $ 805.6 | $ 661.8
Notes payable, Carrying value |  | 3,301.3 | 3,811.5 |  |
Homebuilding [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Carrying value |  | 862.9 | 1,355.9 |  |
Restricted cash, Carrying value |  | 11.8 | 9.7 |  |
Notes payable, Carrying value |  | 2,797.1 | 3,333.6 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair value | [1] | 862.9 | 1,355.9 |  |
Restricted cash, Fair value | [1] | 11.8 | 9.7 |  |
Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair value | [1] | 0.0 | 0.0 |  |
Restricted cash, Fair value | [1] | 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 | [1] | 0.0 | 0.0 |  |
Restricted cash, Fair value | [1] | 0.0 | 0.0 |  |
Financial Services [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage |  | 634.5 | 631.0 |  |
Cash and cash equivalents, Carrying value |  | 43.9 | 27.9 |  |
Mortgage repurchase facility |  | 504.2 | 477.9 |  |
Financial Services [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair value | [1] | 43.9 | 27.9 |  |
Mortgage repurchase facility, Fair value | [1] | 0.0 | 0.0 |  |
Financial Services [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair value | [1] | 0.0 | 0.0 |  |
Mortgage repurchase facility, Fair value | [1] | 0.0 | 0.0 |  |
Financial Services [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair value | [1] | 0.0 | 0.0 |  |
Mortgage repurchase facility, Fair value | [1] | 504.2 | 477.9 |  |
Senior Notes [Member] | Homebuilding [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Carrying value |  | 2,785.7 | 3,325.5 |  |
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 0.0 | 0.0 |  |
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 2,904.1 | 3,405.9 |  |
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 0.0 | 0.0 |  |
Secured Debt [Member] | Homebuilding [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Carrying value |  | 11.4 | 8.1 |  |
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 0.0 | 0.0 |  |
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 0.0 | 0.0 |  |
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 11.4 | 8.1 |  |
Estimate of Fair Value Measurement [Member] | Homebuilding [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair value | [1] | 862.9 | 1,355.9 |  |
Restricted cash, Fair value | [1] | 11.8 | 9.7 |  |
Estimate of Fair Value Measurement [Member] | Financial Services [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair value | [1] | 43.9 | 27.9 |  |
Mortgage repurchase facility, Fair value | [1] | 504.2 | 477.9 |  |
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Homebuilding [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 2,904.1 | 3,405.9 |  |
Estimate of Fair Value Measurement [Member] | Secured Debt [Member] | Homebuilding [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes payable, Fair value | [2] | 11.4 | 8.1 |  |
Fair Value, Measurements, Recurring [Member] | Financial Services [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage | [3] | 0.0 | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Financial Services [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage | [3] | 620.1 | 617.1 |  |
Fair Value, Measurements, Recurring [Member] | Financial Services [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage | [3] | 14.4 | 13.9 | $ 13.5 | $ 12.0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Financial Services [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage | [3] | $ 634.5 | $ 631.0 |  |
[1] | The fair value approximates carrying value due to its short-term nature, short maturity or floating interest rate terms, as applicable.
[2] | The fair value is determined based on quoted market prices of recent transactions of the notes, which is classified as Level 2 within the fair value hierarchy.
[3] | Mortgage loans held for sale are reflected at fair value. Interest income earned on mortgage loans held for sale is based on contractual interest rates and included in financial services interest and other income. Mortgage loans held for sale at June 30, 2016 and September 30, 2015 include $14.4 million and $13.9 million, respectively, of loans for which the Company elected the fair value option upon origination and which the Company did not sell into the secondary market. Mortgage loans held for sale totaling $14.9 million and $2.9 million were transferred to Level 3 during the nine months ended June 30, 2016 and 2015, respectively, due to significant unobservable inputs used in determining the fair value of the loans. The fair value of these mortgage loans held for sale is generally calculated considering the secondary market and adjusted for the value of the underlying collateral, including interest rate risk, liquidity risk and prepayment risk.

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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 -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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + 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 Fair value portion of notes payable. + 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 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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