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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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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

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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
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Amount of investments classified as other.

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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 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
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