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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2015 | Jul. 31, 2015 | Oct. 31, 2014
Holland Creek Metropolitan District [Member] |  |  |
Credit-enhanced bonds issued amount | $ 8,000 |  |
Amount outstanding in letters of credit | 8,100 |  |
Red Sky Ranch Metropolitan District [Member] |  |  |
Other long-term liabilities | $ 1,800 | $ 1,800 | $ 1,800
Estimated cessation date of capital improvement fee payment obligation | Jul. 31, 2029 |  |
Various Other [Member] |  |  |
Amount outstanding in letters of credit | $ 64,600 |  |
Employee Housing Bonds [Member] |  |  |
Amount outstanding in letters of credit | 53,400 |  |
Workers' Compensation and General Liability Related to Construction and Development Activities [Member] |  |  |
Amount outstanding in letters of credit | $ 11,200 |  |

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