Inventory - Summary of Interests in Lot Option Agreements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Real Estate Properties [Line Items]
Deposits and non-refundable preacquisition costs incurred	$ 44,301	$ 37,313
Remaining obligations	362,044	288,638
Land not owned under option agreements	7,751	9,124
Consolidated VIEs
Real Estate Properties [Line Items]
Deposits and non-refundable preacquisition costs incurred	4,604	4,491
Remaining obligations	3,147	4,633
Land not owned under option agreements	7,751	9,124
Unconsolidated lot option agreements
Real Estate Properties [Line Items]
Deposits and non-refundable preacquisition costs incurred	39,697	32,822
Remaining obligations	358,897	284,005
Land not owned under option agreements	$ 0	$ 0