Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Consolidation	Basis of Consolidation. These unaudited consolidated financial statements present the consolidated financial position, income, comprehensive income and cash flows of the Company and our subsidiaries. Intercompany balances have been eliminated in consolidation.
Inventory Valuation	Inventory Valuation. We assess our inventory assets no less than quarterly for recoverability in accordance with the policies as described in Notes 1 and 4 to the consolidated financial statements in our 2014 Annual Report. Our homebuilding inventories that are accounted for as held for development include land and home construction assets grouped together as communities. Homebuilding inventories held for development are stated at cost (including direct construction costs, capitalized indirect costs, capitalized interest and real estate taxes) unless facts and circumstances indicate that the carrying value of the assets may not be recoverable. For those communities for which construction and development activities are expected to occur in the future or have been idled (land held for future development), all applicable interest and real estate taxes are expensed as incurred and the inventory is stated at cost unless facts and circumstances indicate that the carrying value of the assets may not be recoverable. We record assets held for sale at the lower of the carrying value or fair value less costs to sell.
New Accounting Pronouncements	Recent Accounting Pronouncements. Revenue from Contracts with Customers. In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"). ASU 2014-09 requires companies to recognize revenue at an amount that the entity expects to be entitled to upon transferring control of goods or services to a customer, as opposed to when risks and rewards transfer to a customer under the existing revenue recognition guidance. The FASB has tentatively decided to defer for one year the effective date of ASU 2014-09, which would make the guidance effective for the Company's first fiscal year beginning after December 15, 2017. Additionally, the FASB also tentatively decided to permit entities to early adopt the standard, which allows for either full retrospective or modified retrospective methods of adoption, for reporting periods beginning after December 15, 2016. We are currently evaluating the impact of ASU 2014-09 on our consolidated financial statements. Presentation of Debt Issuance Costs. In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). ASU 2015-03 requires debt issuance costs to be presented on the balance sheet as a direct deduction from the related debt liability, similar to the presentation of debt discounts or premiums. The costs will continue to be amortized to interest expense using the effective interest method. ASU 2015-03 requires retrospective application to all prior periods presented in the financial statements. Upon transition, an entity is required to comply with the applicable disclosures for a change in accounting principle. The guidance within ASU 2015-03 will be effective for the Company's first fiscal year beginning after December 15, 2015, but we have the option of adopting the new requirements as of an earlier date. We are evaluating the impact of ASU 2015-03, but only expect our balance sheet presentation of debt issuance costs to change as a result.
Income Tax, Policy	In July 2013, the FASB issued ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists ("ASU 2013-11"), to provide guidance on the presentation of unrecognized tax benefits. ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward with certain limited exceptions. ASU 2013-11 was effective for annual reporting periods beginning on or after December 15, 2013 and interim periods within those annual periods. The Company adopted this guidance in the quarter ended December 31, 2014 with no significant impact to our financial statements.

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

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Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory.

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