Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Other Contingencies	Commitments and Contingencies Contractual Obligations and Off-Balance Sheet Arrangements In support of the Company's residential lot development business, it issues letters of credit under the revolving credit facility and has a surety bond program that provides financial assurance to beneficiaries related to the execution and performance of certain development obligations. At March 31, 2025, the Company had outstanding letters of credit of $22.3 million under the revolving credit facility and surety bonds of $804.4 million issued by third parties to secure performance under various contracts. The Company expects that its performance obligations secured by these letters of credit and bonds will generally be completed in the ordinary course of business and in accordance with the applicable contractual terms. When the Company completes its performance obligations, the related letters of credit and bonds are generally released shortly thereafter, leaving the Company with no continuing obligations. The Company has no material third-party guarantees. Litigation On September 6, 2024, the Maryland Department of Environment (MDE) filed suit in the Circuit Court for Harford County, Maryland against the Company regarding various alleged stormwater compliance issues and violations at a project in Maryland dating from 2022 through 2024, seeking injunctive relief and civil penalties. Since the Company's first discovery of these issues, it has enhanced its practices and procedures related to stormwater compliance at the project in question, and is seeking to resolve these matters through further discussions with MDE. The Company does not believe it is reasonably possible that this matter would result in a loss that would have a material effect on its consolidated financial position, results of operations or cash flows. In addition, the Company is involved in various other legal proceedings that arise from time to time in the ordinary course of business and believes that adequate reserves have been established for any probable losses. The Company does not believe that the outcome of any of these proceedings will have a significant adverse effect on its financial position, long-term results of operations or cash flows. It is possible, however, that charges related to these matters could be significant to the Company's results or cash flows in any one accounting period. Land Purchase Contracts The Company enters into land purchase contracts to acquire land for the development of residential lots. Under these contracts, the Company will fund a stated deposit in consideration for the right, but not the obligation, to purchase land or lots at a future point in time with predetermined terms. Under the terms of many of the purchase contracts, the deposits are not refundable in the event the Company elects to terminate the contract. Land purchase contract deposits and capitalized pre-acquisition costs are expensed to cost of sales when the Company believes it is probable that it will not acquire the property under contract and will not be able to recover these costs through other means. At March 31, 2025, the Company had total deposits of $36.2 million related to contracts to purchase land with a total remaining purchase price of approximately $783.7 million. The majority of land and lots under contract are currently expected to be purchased within 3 years. None of the land purchase contracts were subject to specific performance provisions at March 31, 2025.