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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Oct. 31, 2015
Amount outstanding in letters of credit $ 66.3    
Surety Bonds Outstanding 9.3    
Holland Creek Metropolitan District [Member]      
Credit-enhanced bonds issued amount 8.0    
Amount outstanding in letters of credit 8.1    
Red Sky Ranch Metropolitan District [Member]      
Other long-term liabilities $ 2.0 $ 2.0 $ 1.8
Estimated cessation date of capital improvement fee payment obligation Jul. 31, 2031    
Employee Housing Bonds [Member]      
Amount outstanding in letters of credit $ 53.4    
Workers' Compensation and General Liability Related to Construction and Development Activities [Member]      
Amount outstanding in letters of credit $ 12.9