Commitments and Contingencies (Details Textual 1) $ in Millions	Jan. 31, 2017 USD ($) luxury_homes
Backlog Information [Abstract]
Number of homes to be delivered (in ones) | luxury_homes	5,145
Aggregate sales value of outstanding homes to be delivered	$ 4,350.0
May 2016 Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Outstanding letter of credit	112.4
Surety Bond Construction Improvements [Member]
Loss Contingencies [Line Items]
Outstanding Surety Bonds Amount	667.1
Amount of work remains on improvements in the Company's various communities	345.4
Surety Bond Other Obligations [Member]
Loss Contingencies [Line Items]
Additional outstanding surety bonds	$ 137.7