Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands |
6 Months Ended | ||
|---|---|---|---|
Jan. 31, 2016 |
Jul. 31, 2015 |
Jan. 31, 2015 |
|
| Surety Bonds Outstanding | $ 9,300 | ||
| 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 |