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Inventory - Summary of Interests in Lot Option Agreements (Details) - Unconsolidated lot option agreements - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Real Estate Properties [Line Items]
Deposits & Non-refundable Pre-acquisition Costs Incurred	$ 78,202	$ 72,191
Remaining Obligation	$ 389,705	$ 383,150

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