Inventory - Recoverability Schedule of Inventory Assets Held for Development, by Reportable Segment (Details) $ in Thousands	Mar. 31, 2017 Community	Mar. 31, 2016 property	Mar. 31, 2016 Community	Mar. 31, 2016	Mar. 31, 2016 USD ($)
Real Estate Properties [Line Items]
Number of Communities on Watch List	6	9	2
Undiscounted Cash Flow Analyses Prepared, Number of Communities	0	2
Undiscounted Cash Flow Analyses Prepared, Pre-analysis Book Value (BV) | $					$ 21,914
Corporate and unallocated
Real Estate Properties [Line Items]
Number of Communities on Watch List | property		0
Undiscounted Cash Flow Analyses Prepared, Number of Communities | property		0
Undiscounted Cash Flow Analyses Prepared, Pre-analysis Book Value (BV) | $					1,105
West Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List | Community	5
West Segment | Operating Segments
Real Estate Properties [Line Items]
Number of Communities on Watch List | Community			8
Undiscounted Cash Flow Analyses Prepared, Number of Communities | Community			2
Undiscounted Cash Flow Analyses Prepared, Pre-analysis Book Value (BV) | $					20,809
Undiscounted Cash Flow Analyses Prepared, Aggregate Undiscounted Cash Flow as a Percentage of Book Value				108.00%
East Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List | Community	1
East Segment | Operating Segments
Real Estate Properties [Line Items]
Number of Communities on Watch List | property		1
Undiscounted Cash Flow Analyses Prepared, Number of Communities | property		0
Undiscounted Cash Flow Analyses Prepared, Pre-analysis Book Value (BV) | $					$ 0
Undiscounted Cash Flow Analyses Prepared, Aggregate Undiscounted Cash Flow as a Percentage of Book Value				0.00%