Inventory - Recoverability Schedule of Inventory Assets Held for Development, by Reportable Segment (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015 home Community	Mar. 31, 2014 property	Mar. 31, 2015 home	Mar. 31, 2014 property
Real Estate Properties [Line Items]
Number of Communities on Watch List	1	4	1	4
Undiscounted Cash Flow Analysis Prepared for Number of Communities	0	1
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value		0.00%
West Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List	1	1
Undiscounted Cash Flow Analysis Prepared for Number of Communities	0	0
Undiscounted Cash Flow Analysis, Pre-analysis Book Value	0	0
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value	0.00%	0.00%
East Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List		1
Undiscounted Cash Flow Analysis Prepared for Number of Communities		0
Undiscounted Cash Flow Analysis, Pre-analysis Book Value		0
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value		0.00%
Southeast Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List		2
Undiscounted Cash Flow Analysis Prepared for Number of Communities		1
Undiscounted Cash Flow Analysis, Pre-analysis Book Value		7,478,000
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value		107.90%