Owned Inventory - Summary of Interests in Lot Option Agreements (Details) - Unconsolidated lot option agreements - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Real Estate Properties [Line Items]
Deposits & Non-refundable Pre-acquisition Costs Incurred (a)	$ 121,581	$ 114,688
Remaining Obligation, Net of Deposits	$ 715,350	$ 676,149

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration