Inventory - Summary of Interests in Lot Option Agreements (Details) - Unconsolidated lot option agreements - USD ($) $ in Thousands |
Dec. 31, 2018 |
Sep. 30, 2018 |
---|---|---|
Real Estate Properties [Line Items] | ||
Deposits & Non-refundable Pre-acquisition Costs Incurred | $ 71,644 | $ 72,191 |
Remaining Obligation | $ 367,026 | $ 383,150 |