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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Financial Services [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Mortgage loans held for sale | $ 587.3 | $ 654.0 |
Recurring [Member] | Level 1 [Member] | Homebuilding [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities collateralized by residential real estate | 0.0 |  |
Recurring [Member] | Level 1 [Member] | Financial Services [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Mortgage loans held for sale | 0.0 | 0.0 |
Recurring [Member] | Level 1 [Member] | Financial Services [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 0.0 | 0.0 |
Recurring [Member] | Level 1 [Member] | Financial Services [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 0.0 | 0.0 |
Recurring [Member] | Level 1 [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 0.0 | 0.0 |
Recurring [Member] | Level 2 [Member] | Homebuilding [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities collateralized by residential real estate | 0.0 |  |
Recurring [Member] | Level 2 [Member] | Financial Services [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Mortgage loans held for sale | 580.2 | 640.9 |
Recurring [Member] | Level 2 [Member] | Financial Services [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 9.4 | 9.3 |
Recurring [Member] | Level 2 [Member] | Financial Services [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 1.1 | (2.6) |
Recurring [Member] | Level 2 [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 0.6 | (0.2) |
Recurring [Member] | Level 3 [Member] | Homebuilding [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities collateralized by residential real estate | 8.8 | 0.0 | $ 33.9
Recurring [Member] | Level 3 [Member] | Financial Services [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Mortgage loans held for sale | 5.6 | 6.8 | $ 13.9
Recurring [Member] | Level 3 [Member] | Financial Services [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 0.0 | 0.0 |
Recurring [Member] | Level 3 [Member] | Financial Services [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 0.0 | 0.0 |
Recurring [Member] | Level 3 [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 0.0 | 0.0 |
Estimate fair value [Member] | Recurring [Member] | Homebuilding [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities collateralized by residential real estate | 8.8 |  |
Estimate fair value [Member] | Recurring [Member] | Financial Services [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Mortgage loans held for sale | 585.8 | 647.7 |
Estimate fair value [Member] | Recurring [Member] | Financial Services [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 9.4 | 9.3 |
Estimate fair value [Member] | Recurring [Member] | Financial Services [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | 1.1 | (2.6) |
Estimate fair value [Member] | Recurring [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Derivatives not designated as hedging instruments | $ 0.6 | $ (0.2) |

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- Definition Fair value as of the balance sheet date of all derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + 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=82891408&loc=d3e4428-111522 + Details
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