Inventory - Summary of Interests in Lot Option Agreements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Real Estate Properties [Line Items]
Deposits & Non-refundable Preacquisition Costs Incurred	$ 43,529	$ 37,313
Remaining Obligation	420,534	288,638
Land Not Owned - Under Option Agreements	3,857	9,124
Consolidated VIEs
Real Estate Properties [Line Items]
Deposits & Non-refundable Preacquisition Costs Incurred	941	4,491
Remaining Obligation	2,916	4,633
Land Not Owned - Under Option Agreements	3,857	9,124
Unconsolidated lot option agreements
Real Estate Properties [Line Items]
Deposits & Non-refundable Preacquisition Costs Incurred	42,588	32,822
Remaining Obligation	417,618	284,005
Land Not Owned - Under Option Agreements	$ 0	$ 0