Commitments and Contingencies (Details Textual 1) - Jul. 31, 2015 $ in Millions	USD ($) luxury_homes
Backlog Information [Abstract]
Number of homes to be delivered (in ones) | luxury_homes	4,447
Aggregate sales value of outstanding homes to be delivered	$ 3,690.0
Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Outstanding letter of credit	103.8
Surety Bond Construction Improvements [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	628.8
Amount of work remains on improvements in the Company's various communities	351.1
Surety Bond Other Obligations [Member]
Loss Contingencies [Line Items]
Additional outstanding surety bonds	$ 114.1