Commitments and Contingencies (Details Textual 1) $ in Millions	Jul. 31, 2016 USD ($) luxury_homes
Backlog Information [Abstract]
Number of homes to be delivered (in ones) | luxury_homes	5,181
Aggregate sales value of outstanding homes to be delivered	$ 4,370.0
Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Outstanding letter of credit	80.0
Surety Bond Construction Improvements [Member]
Loss Contingencies [Line Items]
Outstanding Surety Bonds Amount	659.9
Amount of work remains on improvements in the Company's various communities	351.8
Surety Bond Other Obligations [Member]
Loss Contingencies [Line Items]
Additional outstanding surety bonds	138.4
Restricted Cash and Investments [Member]
Loss Contingencies [Line Items]
Outstanding letter of credit	$ 14.1