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Commitments and Contingencies (Details Textuals) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Loss Contingency [Abstract]
Amount of Captive Insurance - Aggregate Limit	$ 25,000,000
Amount of Captive Insurance - Individual Claim Limit	250,000
Reinsurance coverage acquired by captive insurance subsidiary	15,000,000
Captive Insurance - Aggregate amount beyond reinsurance coverage	10,000,000
Captive Insurance - Individual claim limit beyond reinsurance coverage	250,000
Maximum amount deductible under workers compensation insurance policy	500,000
Deductible policy amount per occurrence	500,000
Other Commitments [Abstract]
Surety bonds	1,200,000,000
Outstanding letters of credit	96,800,000
Rent expense	26,300,000	$ 24,700,000	$ 22,400,000
Letter of credit, other [Member]
Other Commitments [Abstract]
Outstanding letters of credit	2,500,000
Homebuilding [Member]
Loss Contingency [Abstract]
Liabilities for various claims, complaints and other legal actions	$ 420,600,000	$ 423,500,000	451,000,000
Construction defect portion of loss contingency accrual	98.00%	95.00%
Expenses related to legal claims	$ 87,800,000	$ 49,600,000	$ 43,400,000
Estimated insurance recoveries related to legal claims	74,400,000	$ 88,700,000
Land and Lot Option Purchase Contracts [Abstract]
Deposits	227,600,000
Purchase Obligation	4,600,000,000
Homebuilding [Member] | Revolving credit facility, maturing 2018 [Member]
Other Commitments [Abstract]
Outstanding letters of credit	94,300,000
Homebuilding [Member] | Cash Deposits [Member]
Land and Lot Option Purchase Contracts [Abstract]
Deposits	221,300,000
Homebuilding [Member] | Promissory Notes And Surety Bonds [Member]
Land and Lot Option Purchase Contracts [Abstract]
Deposits	6,300,000
Individual Claim Limit [Member]
Loss Contingency [Abstract]
Self-insurance limits	250,000.00
Option Contracts Subject to Specific Performance Clauses [Member] | Homebuilding [Member]
Land and Lot Option Purchase Contracts [Abstract]
Purchase Obligation	29,700,000
Minimum [Member]
Loss Contingency [Abstract]
Amount of self insurance	10,000,000
Maximum [Member]
Loss Contingency [Abstract]
Amount of self insurance	$ 17,500,000

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- Definition

Amount of self insurance.

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Amount of Captive Insurance - Aggregate Limit

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Amount of Captive Insurance - Individual Claim Limit

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Captive Insurance - Aggregate amount beyond reinsurance coverage

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Captive Insurance - Individual claim limit beyond reinsurance coverage

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The portion of the total reserve for legal claims that relates to the entity's construction defect matters, expressed as a percentage.

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Deductible policy amount per occurrence.

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Land and lot option purchase contracts.

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Maximum amount deductible under workers compensation insurance policy.

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Reinsurance coverage acquired by captive insurance subsidiary.

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Description regarding the aggregate and per occurrence limits related to the self-insured portion of our coverage.

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A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price.

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Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Amount of loss contingency liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Name Accounting Standards Codification
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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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The noncurrent portion of the carrying value as of the balance sheet date of a type of municipal bond typically used to fund a development project. Also called special assessment limited liability bond, special district bond, special purpose bond, special tax bond and community development obligation. Interest owed to lenders is paid by taxes levied on the community benefiting from the particular bond-funded project. For example, if a bond of this sort was issued to pay for sidewalks to be repaved in a certain community, an additional tax would be levied on homeowners in the area benefiting from this project.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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