Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with an initial maturity of three months or less when purchased to be cash equivalents. Proceeds from home closings held for the Company’s benefit at title companies are included in homebuilding cash and cash equivalents in the consolidated balance sheets. Cash balances of the Company's captive insurance subsidiary, which are expected to be used to fund the subsidiary's operations and pay future anticipated legal claims, were $41.2 million and $40.5 million at December 31, 2015 and September 30, 2015, respectively, and are included in homebuilding cash and cash equivalents in the consolidated balance sheets.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In January 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-04, “Receivables - Troubled Debt Restructurings by Creditors,” which was revised in August 2014. ASU 2014-04 applies to all creditors who obtain physical possession of residential real estate property collateralizing a consumer mortgage loan in satisfaction of a receivable. The guidance clarifies when an in-substance repossession or foreclosure of the property has occurred and helps determine when a creditor should derecognize a loan receivable and recognize real estate property. ASU 2014-14 applies to creditors that hold government-guaranteed mortgage loans and requires that these loans, including those guaranteed by the Federal Housing Administration (FHA) and Veterans Affairs (VA), be derecognized and that a separate receivable be recognized upon foreclosure if certain conditions are met. Upon foreclosure, the separate receivable should be measured based on the amount of the loan balance expected to be recovered from the guarantor. The guidance was effective for the Company beginning October 1, 2015 and did not have an impact on its consolidated financial position, results of operations or cash flows. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which is a comprehensive new revenue recognition model that will replace most existing revenue recognition guidance. The core principle of this guidance is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. The guidance is effective for the Company beginning October 1, 2018 and allows for full retrospective or modified retrospective methods of adoption. The Company is currently evaluating the impact of this guidance on its consolidated financial position, results of operations and cash flows. In August 2014, the FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern,” which provides guidance about management's responsibility to evaluate whether there is substantial doubt about the entity's ability to continue as a going concern and to provide related footnote disclosures. This guidance is intended to reduce the diversity in the timing and content of footnote disclosures. The guidance is effective for the Company in its fiscal year ending September 30, 2017 and is not expected to have any impact on its consolidated financial position, results of operations or cash flows. In February 2015, the FASB issued ASU 2015-02, “Consolidation,” which changes the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The guidance is effective for the Company beginning October 1, 2016 and is not expected to have a material impact on its consolidated financial position, results of operations or cash flows. In July 2015, the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory,” which simplifies the subsequent measurement of inventory, excluding inventory measured using the last-in, first-out or retail inventory methods. The guidance specifies that inventory currently measured at the lower of cost or market, where market could be determined with different methods, should now be measured at the lower of cost or net realizable value. The guidance is effective for the Company beginning October 1, 2017 and is not expected to have a material impact on its consolidated financial position, results of operations or cash flows. In September 2015, the FASB issued ASU 2015-16, “Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments,” which requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The guidance is effective for the Company beginning October 1, 2016 and is not expected to have a material impact on its consolidated financial position, results of operations or cash flows.

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.