Commitments and Contingencies Commitments and Contingencies (Details Textual 1) $ in Millions		12 Months Ended
	Dec. 10, 2018 ft²	Mar. 31, 2020 USD ($)	Oct. 31, 2018 USD ($) luxury_homes
Backlog Information [Abstract]
Number of homes to be delivered | luxury_homes			6,105
Aggregate sales value of outstanding homes to be delivered			$ 5,520.0
May 2016 Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount			165.4
Surety Bond Construction Improvements [Member]
Loss Contingencies [Line Items]
Outstanding Surety Bonds Amount			692.9
Amount of work remains on improvements in the Company's various communities			342.2
Surety Bond Other Obligations [Member]
Loss Contingencies [Line Items]
Additional outstanding surety bonds			$ 160.2
Subsequent Event [Member]
Loss Contingencies [Line Items]
Lessee, Operating Lease, Term of Contract	16 years
Operating lease square footage | ft²	163,000
Payments for Rent		$ 2.8
Lease Expiration Date	Oct. 01, 2019
Distance from current headquarters (in miles)	4