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Commitments and Contingencies (Details Textuals) - USD ($) | 12 Months Ended
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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 Captive Insurance - Aggregate Limit + References No definition available. + Details
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- Definition Amount of Captive Insurance - Individual Claim Limit + References No definition available. + Details
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- Definition The portion of the total reserve for legal claims that relates to the entity's construction defect matters, expressed as a percentage. + References No definition available. + Details
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- Definition Land and lot option purchase contracts. + References No definition available. + Details
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- Definition Maximum amount deductible under workers compensation insurance policy. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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