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Acquisitions (Details Textuals) (USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2013 Covenants not to compete | Jul. 31, 2012 Covenants not to compete | Jul. 31, 2013 Supply contracts | Jul. 31, 2012 Supply contracts | Jul. 31, 2013 Customer relationships | Jul. 31, 2013 Trade name | Jul. 31, 2013 Licenses and databases | Jul. 31, 2012 Licenses and databases | Mar. 31, 2011 John Hewitt and Sons, Limited (Hewitt) | Jul. 31, 2013 Salvage vehicle auction business and auction platform | Jul. 31, 2013 Salvage vehicle auction business and auction platform Covenants not to compete Minimum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Covenants not to compete Maximum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Supply contracts Minimum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Supply contracts Maximum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Customer relationships Minimum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Customer relationships Maximum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Trade name Minimum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Trade name Maximum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Licenses and databases Minimum | Jul. 31, 2013 Salvage vehicle auction business and auction platform Licenses and databases Maximum | Jul. 31, 2013 Salvage vehicle auction business and auction platform software Minimum | Jul. 31, 2013 Salvage vehicle auction business and auction platform software Maximum
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting stock |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  | $ 87,891 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cost of acquired entity, cash paid |  |  |  |  |  |  |  |  |  |  |  | 34,900 | 84,022 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 267,463 | $ 196,438 | $ 198,620 |  |  |  |  |  |  |  |  | $ 19,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  | 4 years | 4 years | 8 years | 6 years | 6 years | 4 years | 3 years | 1 year |  |  | 3 years | 8 years | 3 years | 8 years | 3 years | 8 years | 3 years | 8 years | 3 years | 8 years | 3 years | 8 years

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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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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