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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2017 | Jul. 31, 2017 | Oct. 31, 2016
Amount outstanding in letters of credit | $ 65.5 |  |
Surety Bonds Outstanding | 9.3 |  |
Holland Creek Metropolitan District [Member] |  |  |
Credit-enhanced bonds issued amount | 6.3 |  |
Amount outstanding in letters of credit | 6.4 |  |
Red Sky Ranch Metropolitan District [Member] |  |  |
Other long-term liabilities | $ 2.0 | $ 2.0 | $ 2.0
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 | $ 12.1 |  |

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