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Acquisitions (Details Textual) (USD $) |  | 3 Months Ended |  |  | 3 Months Ended
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Oct. 31, 2013 | Oct. 31, 2013 Minimum | Oct. 31, 2013 Maximum | Oct. 31, 2013 Customer relationships Minimum | Oct. 31, 2013 Customer relationships Maximum | Oct. 31, 2013 Salvage vehicle auction business and auction platform | Jul. 31, 2013 Salvage vehicle auction business and auction platform | Oct. 31, 2013 Salvage vehicle auction business and auction platform Covenants not to compete Minimum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Covenants not to compete Maximum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Supply contracts Minimum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Supply contracts Maximum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Trade name Minimum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Trade name Maximum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Licenses and databases Minimum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Licenses and databases Maximum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Software Minimum | Oct. 31, 2013 Salvage vehicle auction business and auction platform Software Maximum
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 88,185,000 |  |  |  |  |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  | 3 years | 8 years |  |  | 3 years | 8 years | 3 years | 8 years | 3 years | 8 years | 3 years | 8 years | 3 years | 8 years
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Business acquisition preacquisition contingency, Range |  | 7,000,000 | 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition preacquisition contingency potential exposure fair value | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Range of amount to be paid or to be received to resolve the preacquisition contingency. + References No definition available. + Details
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- Definition Business acquisition preacquisition contingency potential exposure fair value. + References No definition available. + Details
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- Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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