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Acquisitions (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2014 | Apr. 30, 2013
Business Acquisition [Line Items] |  |  |  |
Business acquisition preacquisition contingency potential exposure fair value | $ 14,000,000 |  | $ 14,000,000 |
Increase in goodwill | 5,300,000 |  |  |
Increase in accrued liabilities | 11,500,000 |  |  |
Increase in intangible assets | 7,300,000 |  |  |
Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition preacquisition contingency, Range |  |  | 7,000,000 |
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition preacquisition contingency, Range |  |  | 28,000,000 |
Acquired salvage vehicle and assets of an online marketing company [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition price |  |  | $ 14,761,000 | $ 34,933,000
Acquired salvage vehicle and assets of an online marketing company [Member] | Covenants not to compete | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 3 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Covenants not to compete | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 8 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Supply contracts | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 3 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Supply contracts | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 8 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Customer relationships | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 3 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Customer relationships | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 8 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Trade names | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 3 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Trade names | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 8 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Licenses and databases | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 3 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Licenses and databases | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 8 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Software | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 3 years |
Acquired salvage vehicle and assets of an online marketing company [Member] | Software | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 8 years |

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- Definition Business acquisition preacquisition contingency potential exposure fair value. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of increase (decrease) 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 + Details
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- Definition The increase (decrease) during the reporting period in intangible assets (for example patents and licenses). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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