Inventory - Narrative (Details) (USD $)			3 Months Ended
	Dec. 31, 2012 home	Sep. 30, 2012 home	Dec. 31, 2012 Minimum	Dec. 31, 2011 Minimum	Dec. 31, 2012 Maximum	Dec. 31, 2011 Maximum
Real Estate Properties [Line Items]
Number of substantially completed homes	147	174
Total value of substantially completed homes	$ 33,600,000	$ 39,700,000
Discount rate			10.90%	14.30%	13.00%	17.00%
Deposits and non-refundable preacquisition costs incurred	24,392,000	24,923,000
Total remaining purchase price committed under all options	$ 213,026,000	$ 198,498,000