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Fair Value Measurements - Recurring (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015
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Homebuilding [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities collateralized by residential real estate | $ 8.8 |  |  |
Homebuilding [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities collateralized by residential real estate | 0.0 |  |  |
Homebuilding [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities collateralized by residential real estate | 0.0 |  |  |
Homebuilding [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities collateralized by residential real estate | 8.8 | $ 0.0 | $ 0.0 | $ 33.9
Financial Services and Other [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | 627.4 | 654.0 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | 623.7 | 647.7 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Interest rate lock commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 12.5 | 9.3 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Forward sales of MBS [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 2.5 | (2.6) |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Best-efforts and mandatory commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 1.6 | (0.2) |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest rate lock commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Forward sales of MBS [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Best-efforts and mandatory commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | 618.4 | 640.9 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate lock commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 12.5 | 9.3 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward sales of MBS [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 2.5 | (2.6) |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Best-efforts and mandatory commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 1.6 | (0.2) |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | 5.3 | 6.8 | $ 14.4 | $ 13.9
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate lock commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Forward sales of MBS [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | 0.0 | 0.0 |  |
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Best-efforts and mandatory commitments [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Fair value of interest rate derivatives | $ 0.0 | $ 0.0 |  |

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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=65884687&loc=d3e4428-111522 + Details
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