Inventory - Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014 home	Mar. 31, 2013	Mar. 31, 2014 home	Mar. 31, 2013	Sep. 30, 2013 home
Real Estate Properties [Line Items]
Inventory Impairment and Option Contract Abandonment	$ 0	$ 0	$ 0	$ 0
Number of substantially completed homes	116		116		113
Total value of substantially completed homes	31,000,000		31,000,000		30,700,000
Deposits and non-refundable preacquisition costs incurred	47,067,000		47,067,000		37,313,000
Total remaining purchase price committed under all options	$ 378,495,000		$ 378,495,000		$ 288,638,000