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Commitments and Contingencies (Narrative) (Details) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2013 | Jul. 31, 2012 | Apr. 30, 2012
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 | 58,400,000 |  |
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 |  |

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