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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2012 | Jul. 31, 2011 | Jan. 31, 2011
Holland Creek Metropolitan District [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Credit-enhanced bonds issued amount | $ 8.0 |  |
Amount outstanding in letters of credit | 8.1 |  |
Red Sky Ranch Metropolitan District [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Other long-term liabilities | 1.8 | 1.8 | 1.8
Estimated cessation date of capital improvement fee payment obligation | July 31, 2028 |  |
Various Other [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount outstanding in letters of credit | 59.7 |  |
Employee Housing Bonds [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount outstanding in letters of credit | 53.4 |  |
Workers' Compensation And General Liability Related To Construction And Development Activities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount outstanding in letters of credit | $ 4.4 |  |

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- Definition Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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