Inventory - Recoverability Schedule of Inventory assets Held for Development, by Reportable Segment (Details) $ in Thousands	Mar. 31, 2019 USD ($) Community	Mar. 31, 2018 Community
Real Estate Properties [Line Items]
Number of Communities on Watch List	12	2
Number of Communities	9	0
Pre-analysis Book Value | $	$ 192,399
West Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List	12
Number of Communities	9
Pre-analysis Book Value | $	$ 162,362
Aggregate Undiscounted Cash Flow as a % of BV	79.40%
Corporate and unallocated
Real Estate Properties [Line Items]
Number of Communities on Watch List	0
Number of Communities	0
Pre-analysis Book Value | $	$ 30,037