Inventory - Narrative (Details) (USD $)			3 Months Ended
	Jun. 30, 2013 home	Sep. 30, 2012 home	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2012 Maximum
Real Estate Properties [Line Items]
Number of substantially completed homes	85	174
Total value of substantially completed homes	$ 20,900,000	$ 39,700,000
Discount rate			14.60%	16.30%
Deposits and non-refundable preacquisition costs incurred	30,299,000	24,923,000
Total remaining purchase price committed under all options	$ 284,643,000	$ 198,498,000