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Summary of Significant Accounting Policies (Details Textuals) (USD $) | 12 Months Ended
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Jul. 31, 2012 Segments | Jul. 31, 2011 | Jul. 31, 2010
Accounting Policies [Abstract] |  |  |
Common stock outstanding reclassified from no par value to par value | $ 12,000 | $ 13,000 |
Par value of common stock on reclassification from no par value to par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
Number of shares issued as stock dividend for each share held (in shares) | 1 |  |
Number of operating segments | 2 |  |
Number of reportable segment | 1 |  |
Accelerated recognition in service revenue |  | 14,400,000 |
Accelerated recognition in yard operation expenses |  | 13,500,000 |
Advertising expenses | $ 6,500,000 | $ 8,800,000 | $ 12,700,000

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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