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Acquisitions (Details) (Acquired salvage vehicle and assets of an online marketing company [Member], USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jan. 31, 2015
Business Acquisition [Line Items] |
Decrease in goodwill | $ 0.8 us-gaap_GoodwillPeriodIncreaseDecrease
Increase in intangible assets | $ 0.9 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent
Covenants not to compete | Minimum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 3 years
Covenants not to compete | Maximum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 8 years
Supply contracts | Minimum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 3 years
Supply contracts | Maximum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 8 years
Customer relationships | Minimum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 3 years
Customer relationships | Maximum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 8 years
Trade names | Minimum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 3 years
Trade names | Maximum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 8 years
Licenses and databases | Minimum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 3 years
Licenses and databases | Maximum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 8 years
Software | Minimum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 3 years
Software | Maximum |
Business Acquisition [Line Items] |
Useful life of intangible assets | 8 years

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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 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=35741047&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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