Commitments and Contingencies (Details Textual 1) $ in Millions	Jan. 31, 2016 USD ($) luxury_homes
Backlog Information [Abstract]
Number of homes to be delivered (in ones) | luxury_homes	4,251
Aggregate sales value of outstanding homes to be delivered	$ 3,660.0
Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Outstanding letter of credit	108.3
Surety Bond Construction Improvements [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	620.5
Amount of work remains on improvements in the Company's various communities	331.7
Surety Bond Other Obligations [Member]
Loss Contingencies [Line Items]
Additional outstanding surety bonds	$ 130.1