Commitments and Contingencies (Narrative) (Details) (USD $)	9 Months Ended
	Apr. 30, 2014	Jul. 31, 2013	Apr. 30, 2013
Holland Creek Metropolitan District [Member]
Credit-enhanced bonds issued amount	$ 8,000,000
Amount outstanding in letters of credit	8,100,000
Red Sky Ranch Metropolitan District [Member]
Other long-term liabilities	1,800,000	1,800,000	1,800,000
Estimated cessation date of capital improvement fee payment obligation	July 31, 2028
Various Other [Member]
Amount outstanding in letters of credit	58,700,000
Employee Housing Bonds [Member]
Amount outstanding in letters of credit	53,400,000
Workers' Compensation and General Liability Related to Construction and Development Activities [Member]
Amount outstanding in letters of credit	$ 3,400,000